amiro-blt / Target / Demo / ARMCM4_STM32F405_Power_Management_GCC / Boot / lib / stdperiphlib / STM32F4xx_StdPeriph_Driver / src / stm32f4xx_i2c.c @ 69661903
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/**
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******************************************************************************
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* @file stm32f4xx_i2c.c
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* @author MCD Application Team
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* @version V1.1.0
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* @date 11-January-2013
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* @brief This file provides firmware functions to manage the following
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* functionalities of the Inter-integrated circuit (I2C)
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* + Initialization and Configuration
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* + Data transfers
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* + PEC management
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* + DMA transfers management
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* + Interrupts, events and flags management
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*
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@verbatim
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===============================================================================
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##### How to use this driver #####
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===============================================================================
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[..]
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(#) Enable peripheral clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2Cx, ENABLE)
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function for I2C1, I2C2 or I2C3.
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(#) Enable SDA, SCL and SMBA (when used) GPIO clocks using
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RCC_AHBPeriphClockCmd() function.
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(#) Peripherals alternate function:
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(++) Connect the pin to the desired peripherals' Alternate
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Function (AF) using GPIO_PinAFConfig() function
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(++) Configure the desired pin in alternate function by:
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GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
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(++) Select the type, pull-up/pull-down and output speed via
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GPIO_PuPd, GPIO_OType and GPIO_Speed members
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(++) Call GPIO_Init() function
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Recommended configuration is Push-Pull, Pull-up, Open-Drain.
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Add an external pull up if necessary (typically 4.7 KOhm).
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(#) Program the Mode, duty cycle , Own address, Ack, Speed and Acknowledged
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Address using the I2C_Init() function.
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(#) Optionally you can enable/configure the following parameters without
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re-initialization (i.e there is no need to call again I2C_Init() function):
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(++) Enable the acknowledge feature using I2C_AcknowledgeConfig() function
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(++) Enable the dual addressing mode using I2C_DualAddressCmd() function
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(++) Enable the general call using the I2C_GeneralCallCmd() function
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(++) Enable the clock stretching using I2C_StretchClockCmd() function
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(++) Enable the fast mode duty cycle using the I2C_FastModeDutyCycleConfig()
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function.
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(++) Configure the NACK position for Master Receiver mode in case of
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2 bytes reception using the function I2C_NACKPositionConfig().
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(++) Enable the PEC Calculation using I2C_CalculatePEC() function
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(++) For SMBus Mode:
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(+++) Enable the Address Resolution Protocol (ARP) using I2C_ARPCmd() function
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(+++) Configure the SMBusAlert pin using I2C_SMBusAlertConfig() function
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(#) Enable the NVIC and the corresponding interrupt using the function
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I2C_ITConfig() if you need to use interrupt mode.
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(#) When using the DMA mode
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(++) Configure the DMA using DMA_Init() function
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(++) Active the needed channel Request using I2C_DMACmd() or
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I2C_DMALastTransferCmd() function.
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-@@- When using DMA mode, I2C interrupts may be used at the same time to
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control the communication flow (Start/Stop/Ack... events and errors).
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(#) Enable the I2C using the I2C_Cmd() function.
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(#) Enable the DMA using the DMA_Cmd() function when using DMA mode in the
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transfers.
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT 2013 STMicroelectronics</center></h2>
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*
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* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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* You may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.st.com/software_license_agreement_liberty_v2
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_i2c.h" |
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#include "stm32f4xx_rcc.h" |
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/** @addtogroup STM32F4xx_StdPeriph_Driver
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* @{
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*/
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/** @defgroup I2C
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* @brief I2C driver modules
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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#define CR1_CLEAR_MASK ((uint16_t)0xFBF5) /*<! I2C registers Masks */ |
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#define FLAG_MASK ((uint32_t)0x00FFFFFF) /*<! I2C FLAG mask */ |
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#define ITEN_MASK ((uint32_t)0x07000000) /*<! I2C Interrupt Enable mask */ |
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup I2C_Private_Functions
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* @{
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*/
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/** @defgroup I2C_Group1 Initialization and Configuration functions
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* @brief Initialization and Configuration functions
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*
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@verbatim
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===============================================================================
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##### Initialization and Configuration functions #####
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Deinitialize the I2Cx peripheral registers to their default reset values.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @retval None
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*/
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void I2C_DeInit(I2C_TypeDef* I2Cx)
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{
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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if (I2Cx == I2C1)
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{
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/* Enable I2C1 reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE); |
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/* Release I2C1 from reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE); |
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} |
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else if (I2Cx == I2C2) |
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{
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/* Enable I2C2 reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE); |
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/* Release I2C2 from reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE); |
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} |
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else
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{
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if (I2Cx == I2C3)
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{
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/* Enable I2C3 reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE); |
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/* Release I2C3 from reset state */
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE); |
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} |
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} |
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} |
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/**
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* @brief Initializes the I2Cx peripheral according to the specified
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* parameters in the I2C_InitStruct.
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*
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* @note To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency
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* (I2C peripheral input clock) must be a multiple of 10 MHz.
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*
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that contains
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* the configuration information for the specified I2C peripheral.
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* @retval None
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*/
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void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
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{
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uint16_t tmpreg = 0, freqrange = 0; |
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uint16_t result = 0x04;
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uint32_t pclk1 = 8000000;
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RCC_ClocksTypeDef rcc_clocks; |
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed)); |
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assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode)); |
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assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle)); |
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assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1)); |
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assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack)); |
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assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress)); |
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/*---------------------------- I2Cx CR2 Configuration ------------------------*/
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/* Get the I2Cx CR2 value */
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tmpreg = I2Cx->CR2; |
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/* Clear frequency FREQ[5:0] bits */
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tmpreg &= (uint16_t)~((uint16_t)I2C_CR2_FREQ); |
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/* Get pclk1 frequency value */
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RCC_GetClocksFreq(&rcc_clocks); |
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pclk1 = rcc_clocks.PCLK1_Frequency; |
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/* Set frequency bits depending on pclk1 value */
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freqrange = (uint16_t)(pclk1 / 1000000);
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tmpreg |= freqrange; |
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/* Write to I2Cx CR2 */
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I2Cx->CR2 = tmpreg; |
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/*---------------------------- I2Cx CCR Configuration ------------------------*/
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/* Disable the selected I2C peripheral to configure TRISE */
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I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PE); |
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/* Reset tmpreg value */
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/* Clear F/S, DUTY and CCR[11:0] bits */
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tmpreg = 0;
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/* Configure speed in standard mode */
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if (I2C_InitStruct->I2C_ClockSpeed <= 100000) |
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{
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/* Standard mode speed calculate */
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result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
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/* Test if CCR value is under 0x4*/
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if (result < 0x04) |
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{
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/* Set minimum allowed value */
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result = 0x04;
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} |
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/* Set speed value for standard mode */
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tmpreg |= result; |
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/* Set Maximum Rise Time for standard mode */
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I2Cx->TRISE = freqrange + 1;
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} |
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/* Configure speed in fast mode */
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/* To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency (I2C peripheral
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input clock) must be a multiple of 10 MHz */
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else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/ |
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{
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if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
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{
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/* Fast mode speed calculate: Tlow/Thigh = 2 */
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result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
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} |
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else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/ |
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{
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/* Fast mode speed calculate: Tlow/Thigh = 16/9 */
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result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
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/* Set DUTY bit */
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result |= I2C_DutyCycle_16_9; |
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} |
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/* Test if CCR value is under 0x1*/
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if ((result & I2C_CCR_CCR) == 0) |
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{
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/* Set minimum allowed value */
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result |= (uint16_t)0x0001;
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} |
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/* Set speed value and set F/S bit for fast mode */
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tmpreg |= (uint16_t)(result | I2C_CCR_FS); |
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/* Set Maximum Rise Time for fast mode */
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I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1); |
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} |
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/* Write to I2Cx CCR */
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I2Cx->CCR = tmpreg; |
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/* Enable the selected I2C peripheral */
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I2Cx->CR1 |= I2C_CR1_PE; |
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/*---------------------------- I2Cx CR1 Configuration ------------------------*/
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/* Get the I2Cx CR1 value */
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tmpreg = I2Cx->CR1; |
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/* Clear ACK, SMBTYPE and SMBUS bits */
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tmpreg &= CR1_CLEAR_MASK; |
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/* Configure I2Cx: mode and acknowledgement */
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/* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
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/* Set ACK bit according to I2C_Ack value */
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tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack); |
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/* Write to I2Cx CR1 */
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I2Cx->CR1 = tmpreg; |
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/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
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/* Set I2Cx Own Address1 and acknowledged address */
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I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1); |
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} |
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/**
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* @brief Fills each I2C_InitStruct member with its default value.
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* @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure which will be initialized.
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* @retval None
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*/
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void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
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{
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/*---------------- Reset I2C init structure parameters values ----------------*/
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/* initialize the I2C_ClockSpeed member */
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I2C_InitStruct->I2C_ClockSpeed = 5000;
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/* Initialize the I2C_Mode member */
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I2C_InitStruct->I2C_Mode = I2C_Mode_I2C; |
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/* Initialize the I2C_DutyCycle member */
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I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2; |
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/* Initialize the I2C_OwnAddress1 member */
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I2C_InitStruct->I2C_OwnAddress1 = 0;
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/* Initialize the I2C_Ack member */
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I2C_InitStruct->I2C_Ack = I2C_Ack_Disable; |
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/* Initialize the I2C_AcknowledgedAddress member */
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I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; |
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} |
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/**
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* @brief Enables or disables the specified I2C peripheral.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param NewState: new state of the I2Cx peripheral.
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* This parameter can be: ENABLE or DISABLE.
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* @retval None
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*/
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void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
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{
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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assert_param(IS_FUNCTIONAL_STATE(NewState)); |
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if (NewState != DISABLE)
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{
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/* Enable the selected I2C peripheral */
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I2Cx->CR1 |= I2C_CR1_PE; |
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} |
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else
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{
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/* Disable the selected I2C peripheral */
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I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PE); |
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} |
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} |
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/**
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* @brief Enables or disables the Analog filter of I2C peripheral.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param NewState: new state of the Analog filter.
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* This parameter can be: ENABLE or DISABLE.
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* @note This function should be called before initializing and enabling
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the I2C Peripheral.
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* @retval None
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*/
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void I2C_AnalogFilterCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
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{
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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assert_param(IS_FUNCTIONAL_STATE(NewState)); |
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if (NewState != DISABLE)
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{
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/* Enable the analog filter */
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I2Cx->FLTR &= (uint16_t)~((uint16_t)I2C_FLTR_ANOFF); |
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} |
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else
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{
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/* Disable the analog filter */
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I2Cx->FLTR |= I2C_FLTR_ANOFF; |
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} |
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} |
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/**
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* @brief Configures the Digital noise filter of I2C peripheral.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param I2C_DigitalFilter: Coefficient of digital noise filter.
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* This parameter can be a number between 0x00 and 0x0F.
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* @note This function should be called before initializing and enabling
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the I2C Peripheral.
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* @retval None
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*/
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void I2C_DigitalFilterConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DigitalFilter)
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{
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uint16_t tmpreg = 0;
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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assert_param(IS_I2C_DIGITAL_FILTER(I2C_DigitalFilter)); |
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/* Get the old register value */
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tmpreg = I2Cx->FLTR; |
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/* Reset I2Cx DNF bit [3:0] */
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tmpreg &= (uint16_t)~((uint16_t)I2C_FLTR_DNF); |
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/* Set I2Cx DNF coefficient */
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tmpreg |= (uint16_t)((uint16_t)I2C_DigitalFilter & I2C_FLTR_DNF); |
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/* Store the new register value */
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I2Cx->FLTR = tmpreg; |
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} |
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/**
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* @brief Generates I2Cx communication START condition.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param NewState: new state of the I2C START condition generation.
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* This parameter can be: ENABLE or DISABLE.
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* @retval None.
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*/
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void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
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{
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/* Check the parameters */
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assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
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assert_param(IS_FUNCTIONAL_STATE(NewState)); |
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if (NewState != DISABLE)
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{
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/* Generate a START condition */
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I2Cx->CR1 |= I2C_CR1_START; |
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} |
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else
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{
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/* Disable the START condition generation */
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I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_START); |
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} |
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} |
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/**
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* @brief Generates I2Cx communication STOP condition.
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* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
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* @param NewState: new state of the I2C STOP condition generation.
|
| 414 |
* This parameter can be: ENABLE or DISABLE.
|
| 415 |
* @retval None.
|
| 416 |
*/
|
| 417 |
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 418 |
{
|
| 419 |
/* Check the parameters */
|
| 420 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 421 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 422 |
if (NewState != DISABLE)
|
| 423 |
{
|
| 424 |
/* Generate a STOP condition */
|
| 425 |
I2Cx->CR1 |= I2C_CR1_STOP; |
| 426 |
} |
| 427 |
else
|
| 428 |
{
|
| 429 |
/* Disable the STOP condition generation */
|
| 430 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_STOP); |
| 431 |
} |
| 432 |
} |
| 433 |
|
| 434 |
/**
|
| 435 |
* @brief Transmits the address byte to select the slave device.
|
| 436 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 437 |
* @param Address: specifies the slave address which will be transmitted
|
| 438 |
* @param I2C_Direction: specifies whether the I2C device will be a Transmitter
|
| 439 |
* or a Receiver.
|
| 440 |
* This parameter can be one of the following values
|
| 441 |
* @arg I2C_Direction_Transmitter: Transmitter mode
|
| 442 |
* @arg I2C_Direction_Receiver: Receiver mode
|
| 443 |
* @retval None.
|
| 444 |
*/
|
| 445 |
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)
|
| 446 |
{
|
| 447 |
/* Check the parameters */
|
| 448 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 449 |
assert_param(IS_I2C_DIRECTION(I2C_Direction)); |
| 450 |
/* Test on the direction to set/reset the read/write bit */
|
| 451 |
if (I2C_Direction != I2C_Direction_Transmitter)
|
| 452 |
{
|
| 453 |
/* Set the address bit0 for read */
|
| 454 |
Address |= I2C_OAR1_ADD0; |
| 455 |
} |
| 456 |
else
|
| 457 |
{
|
| 458 |
/* Reset the address bit0 for write */
|
| 459 |
Address &= (uint8_t)~((uint8_t)I2C_OAR1_ADD0); |
| 460 |
} |
| 461 |
/* Send the address */
|
| 462 |
I2Cx->DR = Address; |
| 463 |
} |
| 464 |
|
| 465 |
/**
|
| 466 |
* @brief Enables or disables the specified I2C acknowledge feature.
|
| 467 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 468 |
* @param NewState: new state of the I2C Acknowledgement.
|
| 469 |
* This parameter can be: ENABLE or DISABLE.
|
| 470 |
* @retval None.
|
| 471 |
*/
|
| 472 |
void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 473 |
{
|
| 474 |
/* Check the parameters */
|
| 475 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 476 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 477 |
if (NewState != DISABLE)
|
| 478 |
{
|
| 479 |
/* Enable the acknowledgement */
|
| 480 |
I2Cx->CR1 |= I2C_CR1_ACK; |
| 481 |
} |
| 482 |
else
|
| 483 |
{
|
| 484 |
/* Disable the acknowledgement */
|
| 485 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ACK); |
| 486 |
} |
| 487 |
} |
| 488 |
|
| 489 |
/**
|
| 490 |
* @brief Configures the specified I2C own address2.
|
| 491 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 492 |
* @param Address: specifies the 7bit I2C own address2.
|
| 493 |
* @retval None.
|
| 494 |
*/
|
| 495 |
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)
|
| 496 |
{
|
| 497 |
uint16_t tmpreg = 0;
|
| 498 |
|
| 499 |
/* Check the parameters */
|
| 500 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 501 |
|
| 502 |
/* Get the old register value */
|
| 503 |
tmpreg = I2Cx->OAR2; |
| 504 |
|
| 505 |
/* Reset I2Cx Own address2 bit [7:1] */
|
| 506 |
tmpreg &= (uint16_t)~((uint16_t)I2C_OAR2_ADD2); |
| 507 |
|
| 508 |
/* Set I2Cx Own address2 */
|
| 509 |
tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);
|
| 510 |
|
| 511 |
/* Store the new register value */
|
| 512 |
I2Cx->OAR2 = tmpreg; |
| 513 |
} |
| 514 |
|
| 515 |
/**
|
| 516 |
* @brief Enables or disables the specified I2C dual addressing mode.
|
| 517 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 518 |
* @param NewState: new state of the I2C dual addressing mode.
|
| 519 |
* This parameter can be: ENABLE or DISABLE.
|
| 520 |
* @retval None
|
| 521 |
*/
|
| 522 |
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 523 |
{
|
| 524 |
/* Check the parameters */
|
| 525 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 526 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 527 |
if (NewState != DISABLE)
|
| 528 |
{
|
| 529 |
/* Enable dual addressing mode */
|
| 530 |
I2Cx->OAR2 |= I2C_OAR2_ENDUAL; |
| 531 |
} |
| 532 |
else
|
| 533 |
{
|
| 534 |
/* Disable dual addressing mode */
|
| 535 |
I2Cx->OAR2 &= (uint16_t)~((uint16_t)I2C_OAR2_ENDUAL); |
| 536 |
} |
| 537 |
} |
| 538 |
|
| 539 |
/**
|
| 540 |
* @brief Enables or disables the specified I2C general call feature.
|
| 541 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 542 |
* @param NewState: new state of the I2C General call.
|
| 543 |
* This parameter can be: ENABLE or DISABLE.
|
| 544 |
* @retval None
|
| 545 |
*/
|
| 546 |
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 547 |
{
|
| 548 |
/* Check the parameters */
|
| 549 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 550 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 551 |
if (NewState != DISABLE)
|
| 552 |
{
|
| 553 |
/* Enable generall call */
|
| 554 |
I2Cx->CR1 |= I2C_CR1_ENGC; |
| 555 |
} |
| 556 |
else
|
| 557 |
{
|
| 558 |
/* Disable generall call */
|
| 559 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENGC); |
| 560 |
} |
| 561 |
} |
| 562 |
|
| 563 |
/**
|
| 564 |
* @brief Enables or disables the specified I2C software reset.
|
| 565 |
* @note When software reset is enabled, the I2C IOs are released (this can
|
| 566 |
* be useful to recover from bus errors).
|
| 567 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 568 |
* @param NewState: new state of the I2C software reset.
|
| 569 |
* This parameter can be: ENABLE or DISABLE.
|
| 570 |
* @retval None
|
| 571 |
*/
|
| 572 |
void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 573 |
{
|
| 574 |
/* Check the parameters */
|
| 575 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 576 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 577 |
if (NewState != DISABLE)
|
| 578 |
{
|
| 579 |
/* Peripheral under reset */
|
| 580 |
I2Cx->CR1 |= I2C_CR1_SWRST; |
| 581 |
} |
| 582 |
else
|
| 583 |
{
|
| 584 |
/* Peripheral not under reset */
|
| 585 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_SWRST); |
| 586 |
} |
| 587 |
} |
| 588 |
|
| 589 |
/**
|
| 590 |
* @brief Enables or disables the specified I2C Clock stretching.
|
| 591 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 592 |
* @param NewState: new state of the I2Cx Clock stretching.
|
| 593 |
* This parameter can be: ENABLE or DISABLE.
|
| 594 |
* @retval None
|
| 595 |
*/
|
| 596 |
void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 597 |
{
|
| 598 |
/* Check the parameters */
|
| 599 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 600 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 601 |
if (NewState == DISABLE)
|
| 602 |
{
|
| 603 |
/* Enable the selected I2C Clock stretching */
|
| 604 |
I2Cx->CR1 |= I2C_CR1_NOSTRETCH; |
| 605 |
} |
| 606 |
else
|
| 607 |
{
|
| 608 |
/* Disable the selected I2C Clock stretching */
|
| 609 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_NOSTRETCH); |
| 610 |
} |
| 611 |
} |
| 612 |
|
| 613 |
/**
|
| 614 |
* @brief Selects the specified I2C fast mode duty cycle.
|
| 615 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 616 |
* @param I2C_DutyCycle: specifies the fast mode duty cycle.
|
| 617 |
* This parameter can be one of the following values:
|
| 618 |
* @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
|
| 619 |
* @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
|
| 620 |
* @retval None
|
| 621 |
*/
|
| 622 |
void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)
|
| 623 |
{
|
| 624 |
/* Check the parameters */
|
| 625 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 626 |
assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle)); |
| 627 |
if (I2C_DutyCycle != I2C_DutyCycle_16_9)
|
| 628 |
{
|
| 629 |
/* I2C fast mode Tlow/Thigh=2 */
|
| 630 |
I2Cx->CCR &= I2C_DutyCycle_2; |
| 631 |
} |
| 632 |
else
|
| 633 |
{
|
| 634 |
/* I2C fast mode Tlow/Thigh=16/9 */
|
| 635 |
I2Cx->CCR |= I2C_DutyCycle_16_9; |
| 636 |
} |
| 637 |
} |
| 638 |
|
| 639 |
/**
|
| 640 |
* @brief Selects the specified I2C NACK position in master receiver mode.
|
| 641 |
* @note This function is useful in I2C Master Receiver mode when the number
|
| 642 |
* of data to be received is equal to 2. In this case, this function
|
| 643 |
* should be called (with parameter I2C_NACKPosition_Next) before data
|
| 644 |
* reception starts,as described in the 2-byte reception procedure
|
| 645 |
* recommended in Reference Manual in Section: Master receiver.
|
| 646 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 647 |
* @param I2C_NACKPosition: specifies the NACK position.
|
| 648 |
* This parameter can be one of the following values:
|
| 649 |
* @arg I2C_NACKPosition_Next: indicates that the next byte will be the last
|
| 650 |
* received byte.
|
| 651 |
* @arg I2C_NACKPosition_Current: indicates that current byte is the last
|
| 652 |
* received byte.
|
| 653 |
*
|
| 654 |
* @note This function configures the same bit (POS) as I2C_PECPositionConfig()
|
| 655 |
* but is intended to be used in I2C mode while I2C_PECPositionConfig()
|
| 656 |
* is intended to used in SMBUS mode.
|
| 657 |
*
|
| 658 |
* @retval None
|
| 659 |
*/
|
| 660 |
void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition)
|
| 661 |
{
|
| 662 |
/* Check the parameters */
|
| 663 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 664 |
assert_param(IS_I2C_NACK_POSITION(I2C_NACKPosition)); |
| 665 |
|
| 666 |
/* Check the input parameter */
|
| 667 |
if (I2C_NACKPosition == I2C_NACKPosition_Next)
|
| 668 |
{
|
| 669 |
/* Next byte in shift register is the last received byte */
|
| 670 |
I2Cx->CR1 |= I2C_NACKPosition_Next; |
| 671 |
} |
| 672 |
else
|
| 673 |
{
|
| 674 |
/* Current byte in shift register is the last received byte */
|
| 675 |
I2Cx->CR1 &= I2C_NACKPosition_Current; |
| 676 |
} |
| 677 |
} |
| 678 |
|
| 679 |
/**
|
| 680 |
* @brief Drives the SMBusAlert pin high or low for the specified I2C.
|
| 681 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 682 |
* @param I2C_SMBusAlert: specifies SMBAlert pin level.
|
| 683 |
* This parameter can be one of the following values:
|
| 684 |
* @arg I2C_SMBusAlert_Low: SMBAlert pin driven low
|
| 685 |
* @arg I2C_SMBusAlert_High: SMBAlert pin driven high
|
| 686 |
* @retval None
|
| 687 |
*/
|
| 688 |
void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)
|
| 689 |
{
|
| 690 |
/* Check the parameters */
|
| 691 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 692 |
assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert)); |
| 693 |
if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
|
| 694 |
{
|
| 695 |
/* Drive the SMBusAlert pin Low */
|
| 696 |
I2Cx->CR1 |= I2C_SMBusAlert_Low; |
| 697 |
} |
| 698 |
else
|
| 699 |
{
|
| 700 |
/* Drive the SMBusAlert pin High */
|
| 701 |
I2Cx->CR1 &= I2C_SMBusAlert_High; |
| 702 |
} |
| 703 |
} |
| 704 |
|
| 705 |
/**
|
| 706 |
* @brief Enables or disables the specified I2C ARP.
|
| 707 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 708 |
* @param NewState: new state of the I2Cx ARP.
|
| 709 |
* This parameter can be: ENABLE or DISABLE.
|
| 710 |
* @retval None
|
| 711 |
*/
|
| 712 |
void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 713 |
{
|
| 714 |
/* Check the parameters */
|
| 715 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 716 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 717 |
if (NewState != DISABLE)
|
| 718 |
{
|
| 719 |
/* Enable the selected I2C ARP */
|
| 720 |
I2Cx->CR1 |= I2C_CR1_ENARP; |
| 721 |
} |
| 722 |
else
|
| 723 |
{
|
| 724 |
/* Disable the selected I2C ARP */
|
| 725 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENARP); |
| 726 |
} |
| 727 |
} |
| 728 |
/**
|
| 729 |
* @}
|
| 730 |
*/
|
| 731 |
|
| 732 |
/** @defgroup I2C_Group2 Data transfers functions
|
| 733 |
* @brief Data transfers functions
|
| 734 |
*
|
| 735 |
@verbatim
|
| 736 |
===============================================================================
|
| 737 |
##### Data transfers functions #####
|
| 738 |
===============================================================================
|
| 739 |
|
| 740 |
@endverbatim
|
| 741 |
* @{
|
| 742 |
*/
|
| 743 |
|
| 744 |
/**
|
| 745 |
* @brief Sends a data byte through the I2Cx peripheral.
|
| 746 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 747 |
* @param Data: Byte to be transmitted..
|
| 748 |
* @retval None
|
| 749 |
*/
|
| 750 |
void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)
|
| 751 |
{
|
| 752 |
/* Check the parameters */
|
| 753 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 754 |
/* Write in the DR register the data to be sent */
|
| 755 |
I2Cx->DR = Data; |
| 756 |
} |
| 757 |
|
| 758 |
/**
|
| 759 |
* @brief Returns the most recent received data by the I2Cx peripheral.
|
| 760 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 761 |
* @retval The value of the received data.
|
| 762 |
*/
|
| 763 |
uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx) |
| 764 |
{
|
| 765 |
/* Check the parameters */
|
| 766 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 767 |
/* Return the data in the DR register */
|
| 768 |
return (uint8_t)I2Cx->DR;
|
| 769 |
} |
| 770 |
|
| 771 |
/**
|
| 772 |
* @}
|
| 773 |
*/
|
| 774 |
|
| 775 |
/** @defgroup I2C_Group3 PEC management functions
|
| 776 |
* @brief PEC management functions
|
| 777 |
*
|
| 778 |
@verbatim
|
| 779 |
===============================================================================
|
| 780 |
##### PEC management functions #####
|
| 781 |
===============================================================================
|
| 782 |
|
| 783 |
@endverbatim
|
| 784 |
* @{
|
| 785 |
*/
|
| 786 |
|
| 787 |
/**
|
| 788 |
* @brief Enables or disables the specified I2C PEC transfer.
|
| 789 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 790 |
* @param NewState: new state of the I2C PEC transmission.
|
| 791 |
* This parameter can be: ENABLE or DISABLE.
|
| 792 |
* @retval None
|
| 793 |
*/
|
| 794 |
void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 795 |
{
|
| 796 |
/* Check the parameters */
|
| 797 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 798 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 799 |
if (NewState != DISABLE)
|
| 800 |
{
|
| 801 |
/* Enable the selected I2C PEC transmission */
|
| 802 |
I2Cx->CR1 |= I2C_CR1_PEC; |
| 803 |
} |
| 804 |
else
|
| 805 |
{
|
| 806 |
/* Disable the selected I2C PEC transmission */
|
| 807 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PEC); |
| 808 |
} |
| 809 |
} |
| 810 |
|
| 811 |
/**
|
| 812 |
* @brief Selects the specified I2C PEC position.
|
| 813 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 814 |
* @param I2C_PECPosition: specifies the PEC position.
|
| 815 |
* This parameter can be one of the following values:
|
| 816 |
* @arg I2C_PECPosition_Next: indicates that the next byte is PEC
|
| 817 |
* @arg I2C_PECPosition_Current: indicates that current byte is PEC
|
| 818 |
*
|
| 819 |
* @note This function configures the same bit (POS) as I2C_NACKPositionConfig()
|
| 820 |
* but is intended to be used in SMBUS mode while I2C_NACKPositionConfig()
|
| 821 |
* is intended to used in I2C mode.
|
| 822 |
*
|
| 823 |
* @retval None
|
| 824 |
*/
|
| 825 |
void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)
|
| 826 |
{
|
| 827 |
/* Check the parameters */
|
| 828 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 829 |
assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition)); |
| 830 |
if (I2C_PECPosition == I2C_PECPosition_Next)
|
| 831 |
{
|
| 832 |
/* Next byte in shift register is PEC */
|
| 833 |
I2Cx->CR1 |= I2C_PECPosition_Next; |
| 834 |
} |
| 835 |
else
|
| 836 |
{
|
| 837 |
/* Current byte in shift register is PEC */
|
| 838 |
I2Cx->CR1 &= I2C_PECPosition_Current; |
| 839 |
} |
| 840 |
} |
| 841 |
|
| 842 |
/**
|
| 843 |
* @brief Enables or disables the PEC value calculation of the transferred bytes.
|
| 844 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 845 |
* @param NewState: new state of the I2Cx PEC value calculation.
|
| 846 |
* This parameter can be: ENABLE or DISABLE.
|
| 847 |
* @retval None
|
| 848 |
*/
|
| 849 |
void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 850 |
{
|
| 851 |
/* Check the parameters */
|
| 852 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 853 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 854 |
if (NewState != DISABLE)
|
| 855 |
{
|
| 856 |
/* Enable the selected I2C PEC calculation */
|
| 857 |
I2Cx->CR1 |= I2C_CR1_ENPEC; |
| 858 |
} |
| 859 |
else
|
| 860 |
{
|
| 861 |
/* Disable the selected I2C PEC calculation */
|
| 862 |
I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENPEC); |
| 863 |
} |
| 864 |
} |
| 865 |
|
| 866 |
/**
|
| 867 |
* @brief Returns the PEC value for the specified I2C.
|
| 868 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 869 |
* @retval The PEC value.
|
| 870 |
*/
|
| 871 |
uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx) |
| 872 |
{
|
| 873 |
/* Check the parameters */
|
| 874 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 875 |
/* Return the selected I2C PEC value */
|
| 876 |
return ((I2Cx->SR2) >> 8); |
| 877 |
} |
| 878 |
|
| 879 |
/**
|
| 880 |
* @}
|
| 881 |
*/
|
| 882 |
|
| 883 |
/** @defgroup I2C_Group4 DMA transfers management functions
|
| 884 |
* @brief DMA transfers management functions
|
| 885 |
*
|
| 886 |
@verbatim
|
| 887 |
===============================================================================
|
| 888 |
##### DMA transfers management functions #####
|
| 889 |
===============================================================================
|
| 890 |
This section provides functions allowing to configure the I2C DMA channels
|
| 891 |
requests.
|
| 892 |
|
| 893 |
@endverbatim
|
| 894 |
* @{
|
| 895 |
*/
|
| 896 |
|
| 897 |
/**
|
| 898 |
* @brief Enables or disables the specified I2C DMA requests.
|
| 899 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 900 |
* @param NewState: new state of the I2C DMA transfer.
|
| 901 |
* This parameter can be: ENABLE or DISABLE.
|
| 902 |
* @retval None
|
| 903 |
*/
|
| 904 |
void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 905 |
{
|
| 906 |
/* Check the parameters */
|
| 907 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 908 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 909 |
if (NewState != DISABLE)
|
| 910 |
{
|
| 911 |
/* Enable the selected I2C DMA requests */
|
| 912 |
I2Cx->CR2 |= I2C_CR2_DMAEN; |
| 913 |
} |
| 914 |
else
|
| 915 |
{
|
| 916 |
/* Disable the selected I2C DMA requests */
|
| 917 |
I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_DMAEN); |
| 918 |
} |
| 919 |
} |
| 920 |
|
| 921 |
/**
|
| 922 |
* @brief Specifies that the next DMA transfer is the last one.
|
| 923 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 924 |
* @param NewState: new state of the I2C DMA last transfer.
|
| 925 |
* This parameter can be: ENABLE or DISABLE.
|
| 926 |
* @retval None
|
| 927 |
*/
|
| 928 |
void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
|
| 929 |
{
|
| 930 |
/* Check the parameters */
|
| 931 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 932 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 933 |
if (NewState != DISABLE)
|
| 934 |
{
|
| 935 |
/* Next DMA transfer is the last transfer */
|
| 936 |
I2Cx->CR2 |= I2C_CR2_LAST; |
| 937 |
} |
| 938 |
else
|
| 939 |
{
|
| 940 |
/* Next DMA transfer is not the last transfer */
|
| 941 |
I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_LAST); |
| 942 |
} |
| 943 |
} |
| 944 |
|
| 945 |
/**
|
| 946 |
* @}
|
| 947 |
*/
|
| 948 |
|
| 949 |
/** @defgroup I2C_Group5 Interrupts events and flags management functions
|
| 950 |
* @brief Interrupts, events and flags management functions
|
| 951 |
*
|
| 952 |
@verbatim
|
| 953 |
===============================================================================
|
| 954 |
##### Interrupts, events and flags management functions #####
|
| 955 |
===============================================================================
|
| 956 |
[..]
|
| 957 |
This section provides functions allowing to configure the I2C Interrupts
|
| 958 |
sources and check or clear the flags or pending bits status.
|
| 959 |
The user should identify which mode will be used in his application to manage
|
| 960 |
the communication: Polling mode, Interrupt mode or DMA mode.
|
| 961 |
|
| 962 |
|
| 963 |
##### I2C State Monitoring Functions #####
|
| 964 |
===============================================================================
|
| 965 |
[..]
|
| 966 |
This I2C driver provides three different ways for I2C state monitoring
|
| 967 |
depending on the application requirements and constraints:
|
| 968 |
|
| 969 |
|
| 970 |
(#) Basic state monitoring (Using I2C_CheckEvent() function)
|
| 971 |
|
| 972 |
It compares the status registers (SR1 and SR2) content to a given event
|
| 973 |
(can be the combination of one or more flags).
|
| 974 |
It returns SUCCESS if the current status includes the given flags
|
| 975 |
and returns ERROR if one or more flags are missing in the current status.
|
| 976 |
|
| 977 |
(++) When to use
|
| 978 |
(+++) This function is suitable for most applications as well as for startup
|
| 979 |
activity since the events are fully described in the product reference
|
| 980 |
manual (RM0090).
|
| 981 |
(+++) It is also suitable for users who need to define their own events.
|
| 982 |
|
| 983 |
(++) Limitations
|
| 984 |
If an error occurs (ie. error flags are set besides to the monitored
|
| 985 |
flags), the I2C_CheckEvent() function may return SUCCESS despite
|
| 986 |
the communication hold or corrupted real state.
|
| 987 |
In this case, it is advised to use error interrupts to monitor
|
| 988 |
the error events and handle them in the interrupt IRQ handler.
|
| 989 |
|
| 990 |
-@@- For error management, it is advised to use the following functions:
|
| 991 |
(+@@) I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).
|
| 992 |
(+@@) I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.
|
| 993 |
Where x is the peripheral instance (I2C1, I2C2 ...)
|
| 994 |
(+@@) I2C_GetFlagStatus() or I2C_GetITStatus() to be called into the
|
| 995 |
I2Cx_ER_IRQHandler() function in order to determine which error occurred.
|
| 996 |
(+@@) I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd()
|
| 997 |
and/or I2C_GenerateStop() in order to clear the error flag and source
|
| 998 |
and return to correct communication status.
|
| 999 |
|
| 1000 |
|
| 1001 |
(#) Advanced state monitoring (Using the function I2C_GetLastEvent())
|
| 1002 |
|
| 1003 |
Using the function I2C_GetLastEvent() which returns the image of both status
|
| 1004 |
registers in a single word (uint32_t) (Status Register 2 value is shifted left
|
| 1005 |
by 16 bits and concatenated to Status Register 1).
|
| 1006 |
|
| 1007 |
(++) When to use
|
| 1008 |
(+++) This function is suitable for the same applications above but it
|
| 1009 |
allows to overcome the mentioned limitation of I2C_GetFlagStatus()
|
| 1010 |
function.
|
| 1011 |
(+++) The returned value could be compared to events already defined in
|
| 1012 |
the library (stm32f4xx_i2c.h) or to custom values defined by user.
|
| 1013 |
This function is suitable when multiple flags are monitored at the
|
| 1014 |
same time.
|
| 1015 |
(+++) At the opposite of I2C_CheckEvent() function, this function allows
|
| 1016 |
user to choose when an event is accepted (when all events flags are
|
| 1017 |
set and no other flags are set or just when the needed flags are set
|
| 1018 |
like I2C_CheckEvent() function.
|
| 1019 |
|
| 1020 |
(++) Limitations
|
| 1021 |
(+++) User may need to define his own events.
|
| 1022 |
(+++) Same remark concerning the error management is applicable for this
|
| 1023 |
function if user decides to check only regular communication flags
|
| 1024 |
(and ignores error flags).
|
| 1025 |
|
| 1026 |
|
| 1027 |
(#) Flag-based state monitoring (Using the function I2C_GetFlagStatus())
|
| 1028 |
|
| 1029 |
Using the function I2C_GetFlagStatus() which simply returns the status of
|
| 1030 |
one single flag (ie. I2C_FLAG_RXNE ...).
|
| 1031 |
|
| 1032 |
(++) When to use
|
| 1033 |
(+++) This function could be used for specific applications or in debug
|
| 1034 |
phase.
|
| 1035 |
(+++) It is suitable when only one flag checking is needed (most I2C
|
| 1036 |
events are monitored through multiple flags).
|
| 1037 |
(++) Limitations:
|
| 1038 |
(+++) When calling this function, the Status register is accessed.
|
| 1039 |
Some flags are cleared when the status register is accessed.
|
| 1040 |
So checking the status of one Flag, may clear other ones.
|
| 1041 |
(+++) Function may need to be called twice or more in order to monitor
|
| 1042 |
one single event.
|
| 1043 |
|
| 1044 |
For detailed description of Events, please refer to section I2C_Events in
|
| 1045 |
stm32f4xx_i2c.h file.
|
| 1046 |
|
| 1047 |
@endverbatim
|
| 1048 |
* @{
|
| 1049 |
*/
|
| 1050 |
|
| 1051 |
/**
|
| 1052 |
* @brief Reads the specified I2C register and returns its value.
|
| 1053 |
* @param I2C_Register: specifies the register to read.
|
| 1054 |
* This parameter can be one of the following values:
|
| 1055 |
* @arg I2C_Register_CR1: CR1 register.
|
| 1056 |
* @arg I2C_Register_CR2: CR2 register.
|
| 1057 |
* @arg I2C_Register_OAR1: OAR1 register.
|
| 1058 |
* @arg I2C_Register_OAR2: OAR2 register.
|
| 1059 |
* @arg I2C_Register_DR: DR register.
|
| 1060 |
* @arg I2C_Register_SR1: SR1 register.
|
| 1061 |
* @arg I2C_Register_SR2: SR2 register.
|
| 1062 |
* @arg I2C_Register_CCR: CCR register.
|
| 1063 |
* @arg I2C_Register_TRISE: TRISE register.
|
| 1064 |
* @retval The value of the read register.
|
| 1065 |
*/
|
| 1066 |
uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register) |
| 1067 |
{
|
| 1068 |
__IO uint32_t tmp = 0;
|
| 1069 |
|
| 1070 |
/* Check the parameters */
|
| 1071 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1072 |
assert_param(IS_I2C_REGISTER(I2C_Register)); |
| 1073 |
|
| 1074 |
tmp = (uint32_t) I2Cx; |
| 1075 |
tmp += I2C_Register; |
| 1076 |
|
| 1077 |
/* Return the selected register value */
|
| 1078 |
return (*(__IO uint16_t *) tmp);
|
| 1079 |
} |
| 1080 |
|
| 1081 |
/**
|
| 1082 |
* @brief Enables or disables the specified I2C interrupts.
|
| 1083 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1084 |
* @param I2C_IT: specifies the I2C interrupts sources to be enabled or disabled.
|
| 1085 |
* This parameter can be any combination of the following values:
|
| 1086 |
* @arg I2C_IT_BUF: Buffer interrupt mask
|
| 1087 |
* @arg I2C_IT_EVT: Event interrupt mask
|
| 1088 |
* @arg I2C_IT_ERR: Error interrupt mask
|
| 1089 |
* @param NewState: new state of the specified I2C interrupts.
|
| 1090 |
* This parameter can be: ENABLE or DISABLE.
|
| 1091 |
* @retval None
|
| 1092 |
*/
|
| 1093 |
void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)
|
| 1094 |
{
|
| 1095 |
/* Check the parameters */
|
| 1096 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1097 |
assert_param(IS_FUNCTIONAL_STATE(NewState)); |
| 1098 |
assert_param(IS_I2C_CONFIG_IT(I2C_IT)); |
| 1099 |
|
| 1100 |
if (NewState != DISABLE)
|
| 1101 |
{
|
| 1102 |
/* Enable the selected I2C interrupts */
|
| 1103 |
I2Cx->CR2 |= I2C_IT; |
| 1104 |
} |
| 1105 |
else
|
| 1106 |
{
|
| 1107 |
/* Disable the selected I2C interrupts */
|
| 1108 |
I2Cx->CR2 &= (uint16_t)~I2C_IT; |
| 1109 |
} |
| 1110 |
} |
| 1111 |
|
| 1112 |
/*
|
| 1113 |
===============================================================================
|
| 1114 |
1. Basic state monitoring
|
| 1115 |
===============================================================================
|
| 1116 |
*/
|
| 1117 |
|
| 1118 |
/**
|
| 1119 |
* @brief Checks whether the last I2Cx Event is equal to the one passed
|
| 1120 |
* as parameter.
|
| 1121 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1122 |
* @param I2C_EVENT: specifies the event to be checked.
|
| 1123 |
* This parameter can be one of the following values:
|
| 1124 |
* @arg I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED: EV1
|
| 1125 |
* @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED: EV1
|
| 1126 |
* @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED: EV1
|
| 1127 |
* @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED: EV1
|
| 1128 |
* @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED: EV1
|
| 1129 |
* @arg I2C_EVENT_SLAVE_BYTE_RECEIVED: EV2
|
| 1130 |
* @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF): EV2
|
| 1131 |
* @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL): EV2
|
| 1132 |
* @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED: EV3
|
| 1133 |
* @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF): EV3
|
| 1134 |
* @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL): EV3
|
| 1135 |
* @arg I2C_EVENT_SLAVE_ACK_FAILURE: EV3_2
|
| 1136 |
* @arg I2C_EVENT_SLAVE_STOP_DETECTED: EV4
|
| 1137 |
* @arg I2C_EVENT_MASTER_MODE_SELECT: EV5
|
| 1138 |
* @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED: EV6
|
| 1139 |
* @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED: EV6
|
| 1140 |
* @arg I2C_EVENT_MASTER_BYTE_RECEIVED: EV7
|
| 1141 |
* @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING: EV8
|
| 1142 |
* @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED: EV8_2
|
| 1143 |
* @arg I2C_EVENT_MASTER_MODE_ADDRESS10: EV9
|
| 1144 |
*
|
| 1145 |
* @note For detailed description of Events, please refer to section I2C_Events
|
| 1146 |
* in stm32f4xx_i2c.h file.
|
| 1147 |
*
|
| 1148 |
* @retval An ErrorStatus enumeration value:
|
| 1149 |
* - SUCCESS: Last event is equal to the I2C_EVENT
|
| 1150 |
* - ERROR: Last event is different from the I2C_EVENT
|
| 1151 |
*/
|
| 1152 |
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT) |
| 1153 |
{
|
| 1154 |
uint32_t lastevent = 0;
|
| 1155 |
uint32_t flag1 = 0, flag2 = 0; |
| 1156 |
ErrorStatus status = ERROR; |
| 1157 |
|
| 1158 |
/* Check the parameters */
|
| 1159 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1160 |
assert_param(IS_I2C_EVENT(I2C_EVENT)); |
| 1161 |
|
| 1162 |
/* Read the I2Cx status register */
|
| 1163 |
flag1 = I2Cx->SR1; |
| 1164 |
flag2 = I2Cx->SR2; |
| 1165 |
flag2 = flag2 << 16;
|
| 1166 |
|
| 1167 |
/* Get the last event value from I2C status register */
|
| 1168 |
lastevent = (flag1 | flag2) & FLAG_MASK; |
| 1169 |
|
| 1170 |
/* Check whether the last event contains the I2C_EVENT */
|
| 1171 |
if ((lastevent & I2C_EVENT) == I2C_EVENT)
|
| 1172 |
{
|
| 1173 |
/* SUCCESS: last event is equal to I2C_EVENT */
|
| 1174 |
status = SUCCESS; |
| 1175 |
} |
| 1176 |
else
|
| 1177 |
{
|
| 1178 |
/* ERROR: last event is different from I2C_EVENT */
|
| 1179 |
status = ERROR; |
| 1180 |
} |
| 1181 |
/* Return status */
|
| 1182 |
return status;
|
| 1183 |
} |
| 1184 |
|
| 1185 |
/*
|
| 1186 |
===============================================================================
|
| 1187 |
2. Advanced state monitoring
|
| 1188 |
===============================================================================
|
| 1189 |
*/
|
| 1190 |
|
| 1191 |
/**
|
| 1192 |
* @brief Returns the last I2Cx Event.
|
| 1193 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1194 |
*
|
| 1195 |
* @note For detailed description of Events, please refer to section I2C_Events
|
| 1196 |
* in stm32f4xx_i2c.h file.
|
| 1197 |
*
|
| 1198 |
* @retval The last event
|
| 1199 |
*/
|
| 1200 |
uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx) |
| 1201 |
{
|
| 1202 |
uint32_t lastevent = 0;
|
| 1203 |
uint32_t flag1 = 0, flag2 = 0; |
| 1204 |
|
| 1205 |
/* Check the parameters */
|
| 1206 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1207 |
|
| 1208 |
/* Read the I2Cx status register */
|
| 1209 |
flag1 = I2Cx->SR1; |
| 1210 |
flag2 = I2Cx->SR2; |
| 1211 |
flag2 = flag2 << 16;
|
| 1212 |
|
| 1213 |
/* Get the last event value from I2C status register */
|
| 1214 |
lastevent = (flag1 | flag2) & FLAG_MASK; |
| 1215 |
|
| 1216 |
/* Return status */
|
| 1217 |
return lastevent;
|
| 1218 |
} |
| 1219 |
|
| 1220 |
/*
|
| 1221 |
===============================================================================
|
| 1222 |
3. Flag-based state monitoring
|
| 1223 |
===============================================================================
|
| 1224 |
*/
|
| 1225 |
|
| 1226 |
/**
|
| 1227 |
* @brief Checks whether the specified I2C flag is set or not.
|
| 1228 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1229 |
* @param I2C_FLAG: specifies the flag to check.
|
| 1230 |
* This parameter can be one of the following values:
|
| 1231 |
* @arg I2C_FLAG_DUALF: Dual flag (Slave mode)
|
| 1232 |
* @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode)
|
| 1233 |
* @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)
|
| 1234 |
* @arg I2C_FLAG_GENCALL: General call header flag (Slave mode)
|
| 1235 |
* @arg I2C_FLAG_TRA: Transmitter/Receiver flag
|
| 1236 |
* @arg I2C_FLAG_BUSY: Bus busy flag
|
| 1237 |
* @arg I2C_FLAG_MSL: Master/Slave flag
|
| 1238 |
* @arg I2C_FLAG_SMBALERT: SMBus Alert flag
|
| 1239 |
* @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
|
| 1240 |
* @arg I2C_FLAG_PECERR: PEC error in reception flag
|
| 1241 |
* @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
|
| 1242 |
* @arg I2C_FLAG_AF: Acknowledge failure flag
|
| 1243 |
* @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
|
| 1244 |
* @arg I2C_FLAG_BERR: Bus error flag
|
| 1245 |
* @arg I2C_FLAG_TXE: Data register empty flag (Transmitter)
|
| 1246 |
* @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag
|
| 1247 |
* @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode)
|
| 1248 |
* @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
|
| 1249 |
* @arg I2C_FLAG_BTF: Byte transfer finished flag
|
| 1250 |
* @arg I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL"
|
| 1251 |
* Address matched flag (Slave mode)"ENDAD"
|
| 1252 |
* @arg I2C_FLAG_SB: Start bit flag (Master mode)
|
| 1253 |
* @retval The new state of I2C_FLAG (SET or RESET).
|
| 1254 |
*/
|
| 1255 |
FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG) |
| 1256 |
{
|
| 1257 |
FlagStatus bitstatus = RESET; |
| 1258 |
__IO uint32_t i2creg = 0, i2cxbase = 0; |
| 1259 |
|
| 1260 |
/* Check the parameters */
|
| 1261 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1262 |
assert_param(IS_I2C_GET_FLAG(I2C_FLAG)); |
| 1263 |
|
| 1264 |
/* Get the I2Cx peripheral base address */
|
| 1265 |
i2cxbase = (uint32_t)I2Cx; |
| 1266 |
|
| 1267 |
/* Read flag register index */
|
| 1268 |
i2creg = I2C_FLAG >> 28;
|
| 1269 |
|
| 1270 |
/* Get bit[23:0] of the flag */
|
| 1271 |
I2C_FLAG &= FLAG_MASK; |
| 1272 |
|
| 1273 |
if(i2creg != 0) |
| 1274 |
{
|
| 1275 |
/* Get the I2Cx SR1 register address */
|
| 1276 |
i2cxbase += 0x14;
|
| 1277 |
} |
| 1278 |
else
|
| 1279 |
{
|
| 1280 |
/* Flag in I2Cx SR2 Register */
|
| 1281 |
I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
|
| 1282 |
/* Get the I2Cx SR2 register address */
|
| 1283 |
i2cxbase += 0x18;
|
| 1284 |
} |
| 1285 |
|
| 1286 |
if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET)
|
| 1287 |
{
|
| 1288 |
/* I2C_FLAG is set */
|
| 1289 |
bitstatus = SET; |
| 1290 |
} |
| 1291 |
else
|
| 1292 |
{
|
| 1293 |
/* I2C_FLAG is reset */
|
| 1294 |
bitstatus = RESET; |
| 1295 |
} |
| 1296 |
|
| 1297 |
/* Return the I2C_FLAG status */
|
| 1298 |
return bitstatus;
|
| 1299 |
} |
| 1300 |
|
| 1301 |
/**
|
| 1302 |
* @brief Clears the I2Cx's pending flags.
|
| 1303 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1304 |
* @param I2C_FLAG: specifies the flag to clear.
|
| 1305 |
* This parameter can be any combination of the following values:
|
| 1306 |
* @arg I2C_FLAG_SMBALERT: SMBus Alert flag
|
| 1307 |
* @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
|
| 1308 |
* @arg I2C_FLAG_PECERR: PEC error in reception flag
|
| 1309 |
* @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
|
| 1310 |
* @arg I2C_FLAG_AF: Acknowledge failure flag
|
| 1311 |
* @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
|
| 1312 |
* @arg I2C_FLAG_BERR: Bus error flag
|
| 1313 |
*
|
| 1314 |
* @note STOPF (STOP detection) is cleared by software sequence: a read operation
|
| 1315 |
* to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation
|
| 1316 |
* to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
|
| 1317 |
* @note ADD10 (10-bit header sent) is cleared by software sequence: a read
|
| 1318 |
* operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the
|
| 1319 |
* second byte of the address in DR register.
|
| 1320 |
* @note BTF (Byte Transfer Finished) is cleared by software sequence: a read
|
| 1321 |
* operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a
|
| 1322 |
* read/write to I2C_DR register (I2C_SendData()).
|
| 1323 |
* @note ADDR (Address sent) is cleared by software sequence: a read operation to
|
| 1324 |
* I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to
|
| 1325 |
* I2C_SR2 register ((void)(I2Cx->SR2)).
|
| 1326 |
* @note SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1
|
| 1327 |
* register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR
|
| 1328 |
* register (I2C_SendData()).
|
| 1329 |
*
|
| 1330 |
* @retval None
|
| 1331 |
*/
|
| 1332 |
void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
|
| 1333 |
{
|
| 1334 |
uint32_t flagpos = 0;
|
| 1335 |
/* Check the parameters */
|
| 1336 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1337 |
assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG)); |
| 1338 |
/* Get the I2C flag position */
|
| 1339 |
flagpos = I2C_FLAG & FLAG_MASK; |
| 1340 |
/* Clear the selected I2C flag */
|
| 1341 |
I2Cx->SR1 = (uint16_t)~flagpos; |
| 1342 |
} |
| 1343 |
|
| 1344 |
/**
|
| 1345 |
* @brief Checks whether the specified I2C interrupt has occurred or not.
|
| 1346 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1347 |
* @param I2C_IT: specifies the interrupt source to check.
|
| 1348 |
* This parameter can be one of the following values:
|
| 1349 |
* @arg I2C_IT_SMBALERT: SMBus Alert flag
|
| 1350 |
* @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag
|
| 1351 |
* @arg I2C_IT_PECERR: PEC error in reception flag
|
| 1352 |
* @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode)
|
| 1353 |
* @arg I2C_IT_AF: Acknowledge failure flag
|
| 1354 |
* @arg I2C_IT_ARLO: Arbitration lost flag (Master mode)
|
| 1355 |
* @arg I2C_IT_BERR: Bus error flag
|
| 1356 |
* @arg I2C_IT_TXE: Data register empty flag (Transmitter)
|
| 1357 |
* @arg I2C_IT_RXNE: Data register not empty (Receiver) flag
|
| 1358 |
* @arg I2C_IT_STOPF: Stop detection flag (Slave mode)
|
| 1359 |
* @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode)
|
| 1360 |
* @arg I2C_IT_BTF: Byte transfer finished flag
|
| 1361 |
* @arg I2C_IT_ADDR: Address sent flag (Master mode) "ADSL"
|
| 1362 |
* Address matched flag (Slave mode)"ENDAD"
|
| 1363 |
* @arg I2C_IT_SB: Start bit flag (Master mode)
|
| 1364 |
* @retval The new state of I2C_IT (SET or RESET).
|
| 1365 |
*/
|
| 1366 |
ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT) |
| 1367 |
{
|
| 1368 |
ITStatus bitstatus = RESET; |
| 1369 |
uint32_t enablestatus = 0;
|
| 1370 |
|
| 1371 |
/* Check the parameters */
|
| 1372 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1373 |
assert_param(IS_I2C_GET_IT(I2C_IT)); |
| 1374 |
|
| 1375 |
/* Check if the interrupt source is enabled or not */
|
| 1376 |
enablestatus = (uint32_t)(((I2C_IT & ITEN_MASK) >> 16) & (I2Cx->CR2)) ;
|
| 1377 |
|
| 1378 |
/* Get bit[23:0] of the flag */
|
| 1379 |
I2C_IT &= FLAG_MASK; |
| 1380 |
|
| 1381 |
/* Check the status of the specified I2C flag */
|
| 1382 |
if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)
|
| 1383 |
{
|
| 1384 |
/* I2C_IT is set */
|
| 1385 |
bitstatus = SET; |
| 1386 |
} |
| 1387 |
else
|
| 1388 |
{
|
| 1389 |
/* I2C_IT is reset */
|
| 1390 |
bitstatus = RESET; |
| 1391 |
} |
| 1392 |
/* Return the I2C_IT status */
|
| 1393 |
return bitstatus;
|
| 1394 |
} |
| 1395 |
|
| 1396 |
/**
|
| 1397 |
* @brief Clears the I2Cx's interrupt pending bits.
|
| 1398 |
* @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral.
|
| 1399 |
* @param I2C_IT: specifies the interrupt pending bit to clear.
|
| 1400 |
* This parameter can be any combination of the following values:
|
| 1401 |
* @arg I2C_IT_SMBALERT: SMBus Alert interrupt
|
| 1402 |
* @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt
|
| 1403 |
* @arg I2C_IT_PECERR: PEC error in reception interrupt
|
| 1404 |
* @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)
|
| 1405 |
* @arg I2C_IT_AF: Acknowledge failure interrupt
|
| 1406 |
* @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode)
|
| 1407 |
* @arg I2C_IT_BERR: Bus error interrupt
|
| 1408 |
*
|
| 1409 |
* @note STOPF (STOP detection) is cleared by software sequence: a read operation
|
| 1410 |
* to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
|
| 1411 |
* I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
|
| 1412 |
* @note ADD10 (10-bit header sent) is cleared by software sequence: a read
|
| 1413 |
* operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second
|
| 1414 |
* byte of the address in I2C_DR register.
|
| 1415 |
* @note BTF (Byte Transfer Finished) is cleared by software sequence: a read
|
| 1416 |
* operation to I2C_SR1 register (I2C_GetITStatus()) followed by a
|
| 1417 |
* read/write to I2C_DR register (I2C_SendData()).
|
| 1418 |
* @note ADDR (Address sent) is cleared by software sequence: a read operation to
|
| 1419 |
* I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to
|
| 1420 |
* I2C_SR2 register ((void)(I2Cx->SR2)).
|
| 1421 |
* @note SB (Start Bit) is cleared by software sequence: a read operation to
|
| 1422 |
* I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
|
| 1423 |
* I2C_DR register (I2C_SendData()).
|
| 1424 |
* @retval None
|
| 1425 |
*/
|
| 1426 |
void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
|
| 1427 |
{
|
| 1428 |
uint32_t flagpos = 0;
|
| 1429 |
/* Check the parameters */
|
| 1430 |
assert_param(IS_I2C_ALL_PERIPH(I2Cx)); |
| 1431 |
assert_param(IS_I2C_CLEAR_IT(I2C_IT)); |
| 1432 |
|
| 1433 |
/* Get the I2C flag position */
|
| 1434 |
flagpos = I2C_IT & FLAG_MASK; |
| 1435 |
|
| 1436 |
/* Clear the selected I2C flag */
|
| 1437 |
I2Cx->SR1 = (uint16_t)~flagpos; |
| 1438 |
} |
| 1439 |
|
| 1440 |
/**
|
| 1441 |
* @}
|
| 1442 |
*/
|
| 1443 |
|
| 1444 |
/**
|
| 1445 |
* @}
|
| 1446 |
*/
|
| 1447 |
|
| 1448 |
/**
|
| 1449 |
* @}
|
| 1450 |
*/
|
| 1451 |
|
| 1452 |
/**
|
| 1453 |
* @}
|
| 1454 |
*/
|
| 1455 |
|
| 1456 |
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|