amiro-blt / Target / Demo / ARMCM4_STM32F405_Power_Management_GCC / Boot / lib / stdperiphlib / STM32F4xx_StdPeriph_Driver / src / stm32f4xx_exti.c @ 69661903
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1 | 69661903 | Thomas Schöpping | /**
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2 | ******************************************************************************
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3 | * @file stm32f4xx_exti.c
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4 | * @author MCD Application Team
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5 | * @version V1.1.0
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6 | * @date 11-January-2013
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7 | * @brief This file provides firmware functions to manage the following
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8 | * functionalities of the EXTI peripheral:
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9 | * + Initialization and Configuration
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10 | * + Interrupts and flags management
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11 | *
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12 | @verbatim
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13 | |||
14 | ===================================================================
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15 | ##### EXTI features #####
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16 | ===================================================================
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17 | |||
18 | [..] External interrupt/event lines are mapped as following:
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19 | (#) All available GPIO pins are connected to the 16 external
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20 | interrupt/event lines from EXTI0 to EXTI15.
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21 | (#) EXTI line 16 is connected to the PVD Output
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22 | (#) EXTI line 17 is connected to the RTC Alarm event
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23 | (#) EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event
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24 | (#) EXTI line 19 is connected to the Ethernet Wakeup event
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25 | (#) EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event
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26 | (#) EXTI line 21 is connected to the RTC Tamper and Time Stamp events
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27 | (#) EXTI line 22 is connected to the RTC Wakeup event
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28 |
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29 |
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30 | ##### How to use this driver #####
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31 | ===================================================================
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32 |
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33 | [..] In order to use an I/O pin as an external interrupt source, follow steps
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34 | below:
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35 | (#) Configure the I/O in input mode using GPIO_Init()
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36 | (#) Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()
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37 | (#) Select the mode(interrupt, event) and configure the trigger
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38 | selection (Rising, falling or both) using EXTI_Init()
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39 | (#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
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40 | |||
41 | [..]
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42 | (@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
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43 | registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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44 |
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45 | @endverbatim
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46 | *
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47 | ******************************************************************************
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48 | * @attention
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49 | *
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50 | * <h2><center>© COPYRIGHT 2013 STMicroelectronics</center></h2>
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51 | *
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52 | * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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53 | * You may not use this file except in compliance with the License.
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54 | * You may obtain a copy of the License at:
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55 | *
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56 | * http://www.st.com/software_license_agreement_liberty_v2
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57 | *
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58 | * Unless required by applicable law or agreed to in writing, software
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59 | * distributed under the License is distributed on an "AS IS" BASIS,
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60 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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61 | * See the License for the specific language governing permissions and
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62 | * limitations under the License.
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63 | *
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64 | ******************************************************************************
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65 | */
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66 | |||
67 | /* Includes ------------------------------------------------------------------*/
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68 | #include "stm32f4xx_exti.h" |
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69 | |||
70 | /** @addtogroup STM32F4xx_StdPeriph_Driver
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71 | * @{
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72 | */
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73 | |||
74 | /** @defgroup EXTI
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75 | * @brief EXTI driver modules
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76 | * @{
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77 | */
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78 | |||
79 | /* Private typedef -----------------------------------------------------------*/
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80 | /* Private define ------------------------------------------------------------*/
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81 | |||
82 | #define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */ |
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83 | |||
84 | /* Private macro -------------------------------------------------------------*/
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85 | /* Private variables ---------------------------------------------------------*/
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86 | /* Private function prototypes -----------------------------------------------*/
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87 | /* Private functions ---------------------------------------------------------*/
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88 | |||
89 | /** @defgroup EXTI_Private_Functions
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90 | * @{
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91 | */
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92 | |||
93 | /** @defgroup EXTI_Group1 Initialization and Configuration functions
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94 | * @brief Initialization and Configuration functions
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95 | *
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96 | @verbatim
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97 | ===============================================================================
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98 | ##### Initialization and Configuration functions #####
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99 | ===============================================================================
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100 | |||
101 | @endverbatim
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102 | * @{
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103 | */
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104 | |||
105 | /**
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106 | * @brief Deinitializes the EXTI peripheral registers to their default reset values.
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107 | * @param None
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108 | * @retval None
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109 | */
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110 | void EXTI_DeInit(void) |
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111 | { |
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112 | EXTI->IMR = 0x00000000;
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113 | EXTI->EMR = 0x00000000;
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114 | EXTI->RTSR = 0x00000000;
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115 | EXTI->FTSR = 0x00000000;
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116 | EXTI->PR = 0x007FFFFF;
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117 | } |
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118 | |||
119 | /**
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120 | * @brief Initializes the EXTI peripheral according to the specified
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121 | * parameters in the EXTI_InitStruct.
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122 | * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
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123 | * that contains the configuration information for the EXTI peripheral.
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124 | * @retval None
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125 | */
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126 | void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
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127 | { |
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128 | uint32_t tmp = 0;
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129 | |||
130 | /* Check the parameters */
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131 | assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode)); |
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132 | assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger)); |
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133 | assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line)); |
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134 | assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd)); |
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135 | |||
136 | tmp = (uint32_t)EXTI_BASE; |
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137 | |||
138 | if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
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139 | { |
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140 | /* Clear EXTI line configuration */
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141 | EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line; |
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142 | EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line; |
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143 | |||
144 | tmp += EXTI_InitStruct->EXTI_Mode; |
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145 | |||
146 | *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line; |
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147 | |||
148 | /* Clear Rising Falling edge configuration */
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149 | EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line; |
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150 | EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line; |
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151 | |||
152 | /* Select the trigger for the selected external interrupts */
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153 | if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
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154 | { |
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155 | /* Rising Falling edge */
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156 | EXTI->RTSR |= EXTI_InitStruct->EXTI_Line; |
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157 | EXTI->FTSR |= EXTI_InitStruct->EXTI_Line; |
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158 | } |
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159 | else
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160 | { |
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161 | tmp = (uint32_t)EXTI_BASE; |
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162 | tmp += EXTI_InitStruct->EXTI_Trigger; |
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163 | |||
164 | *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line; |
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165 | } |
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166 | } |
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167 | else
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168 | { |
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169 | tmp += EXTI_InitStruct->EXTI_Mode; |
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170 | |||
171 | /* Disable the selected external lines */
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172 | *(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line; |
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173 | } |
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174 | } |
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175 | |||
176 | /**
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177 | * @brief Fills each EXTI_InitStruct member with its reset value.
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178 | * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
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179 | * be initialized.
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180 | * @retval None
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181 | */
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182 | void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
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183 | { |
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184 | EXTI_InitStruct->EXTI_Line = EXTI_LINENONE; |
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185 | EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt; |
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186 | EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling; |
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187 | EXTI_InitStruct->EXTI_LineCmd = DISABLE; |
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188 | } |
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189 | |||
190 | /**
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191 | * @brief Generates a Software interrupt on selected EXTI line.
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192 | * @param EXTI_Line: specifies the EXTI line on which the software interrupt
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193 | * will be generated.
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194 | * This parameter can be any combination of EXTI_Linex where x can be (0..22)
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195 | * @retval None
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196 | */
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197 | void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
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198 | { |
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199 | /* Check the parameters */
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200 | assert_param(IS_EXTI_LINE(EXTI_Line)); |
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201 | |||
202 | EXTI->SWIER |= EXTI_Line; |
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203 | } |
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204 | |||
205 | /**
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206 | * @}
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207 | */
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208 | |||
209 | /** @defgroup EXTI_Group2 Interrupts and flags management functions
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210 | * @brief Interrupts and flags management functions
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211 | *
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212 | @verbatim
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213 | ===============================================================================
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214 | ##### Interrupts and flags management functions #####
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215 | ===============================================================================
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216 | |||
217 | @endverbatim
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218 | * @{
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219 | */
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220 | |||
221 | /**
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222 | * @brief Checks whether the specified EXTI line flag is set or not.
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223 | * @param EXTI_Line: specifies the EXTI line flag to check.
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224 | * This parameter can be EXTI_Linex where x can be(0..22)
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225 | * @retval The new state of EXTI_Line (SET or RESET).
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226 | */
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227 | FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line) |
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228 | { |
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229 | FlagStatus bitstatus = RESET; |
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230 | /* Check the parameters */
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231 | assert_param(IS_GET_EXTI_LINE(EXTI_Line)); |
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232 | |||
233 | if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
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234 | { |
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235 | bitstatus = SET; |
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236 | } |
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237 | else
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238 | { |
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239 | bitstatus = RESET; |
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240 | } |
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241 | return bitstatus;
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242 | } |
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243 | |||
244 | /**
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245 | * @brief Clears the EXTI's line pending flags.
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246 | * @param EXTI_Line: specifies the EXTI lines flags to clear.
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247 | * This parameter can be any combination of EXTI_Linex where x can be (0..22)
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248 | * @retval None
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249 | */
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250 | void EXTI_ClearFlag(uint32_t EXTI_Line)
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251 | { |
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252 | /* Check the parameters */
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253 | assert_param(IS_EXTI_LINE(EXTI_Line)); |
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254 | |||
255 | EXTI->PR = EXTI_Line; |
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256 | } |
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257 | |||
258 | /**
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259 | * @brief Checks whether the specified EXTI line is asserted or not.
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260 | * @param EXTI_Line: specifies the EXTI line to check.
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261 | * This parameter can be EXTI_Linex where x can be(0..22)
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262 | * @retval The new state of EXTI_Line (SET or RESET).
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263 | */
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264 | ITStatus EXTI_GetITStatus(uint32_t EXTI_Line) |
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265 | { |
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266 | ITStatus bitstatus = RESET; |
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267 | uint32_t enablestatus = 0;
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268 | /* Check the parameters */
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269 | assert_param(IS_GET_EXTI_LINE(EXTI_Line)); |
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270 | |||
271 | enablestatus = EXTI->IMR & EXTI_Line; |
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272 | if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
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273 | { |
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274 | bitstatus = SET; |
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275 | } |
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276 | else
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277 | { |
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278 | bitstatus = RESET; |
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279 | } |
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280 | return bitstatus;
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281 | } |
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282 | |||
283 | /**
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284 | * @brief Clears the EXTI's line pending bits.
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285 | * @param EXTI_Line: specifies the EXTI lines to clear.
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286 | * This parameter can be any combination of EXTI_Linex where x can be (0..22)
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287 | * @retval None
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288 | */
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289 | void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
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290 | { |
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291 | /* Check the parameters */
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292 | assert_param(IS_EXTI_LINE(EXTI_Line)); |
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293 | |||
294 | EXTI->PR = EXTI_Line; |
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295 | } |
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296 | |||
297 | /**
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298 | * @}
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299 | */
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300 | |||
301 | /**
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302 | * @}
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303 | */
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304 | |||
305 | /**
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306 | * @}
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307 | */
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308 | |||
309 | /**
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310 | * @}
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311 | */
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312 | |||
313 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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