AMiRo-OS

/*

AMiRo-OS is an operating system designed for the Autonomous Mini Robot (AMiRo) platform.

Copyright (C) 2016..2019  Thomas Schöpping et al.

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef AMIROOS_PERIPHAL_H

#define AMIROOS_PERIPHAL_H

#include <amiro-lld.h>

/*============================================================================*/

/* VERSION                                                                    */

/*============================================================================*/

/**

 * @brief   The periphery abstraction layer interface major version.

 * @note    Changes of the major version imply incompatibilities.

 */

#define PERIPHAL_VERSION_MAJOR    1

/**

 * @brief   The periphery abstraction layer interface minor version.

 * @note    A higher minor version implies new functionalty, but all old interfaces are still available.

 */

#define PERIPHAL_VERSION_MINOR    1

/*============================================================================*/

/* DEPENDENCIES                                                               */

/*============================================================================*/

#include <aosconf.h>

#include <hal.h>

/*============================================================================*/

/* DEBUG                                                                      */

/*============================================================================*/

#if (AMIROOS_CFG_DBG == true) || defined(__DOXYGEN__)

#if defined(__cplusplus)

extern "C" {

#endif /* defined(__cplusplus) */

  void _apalDbgAssertMsg(const bool c, const char* fmt, ...);

  void apalDbgPrintf(const char* fmt, ...);

#if defined(__cplusplus)

}

#endif /* defined(__cplusplus) */

/**

 * @brief Assert function to check a given condition.

 *

 * @param[in] c     The condition to check.

 */

#define apalDbgAssert(c) _apalDbgAssertMsg(c, "%s(%u): apalDbgAssert failed", __FILE__, __LINE__)

#else /* (AMIROOS_CFG_DBG != true) */

#define apalDbgAssert(condition)                                              \

  (void)(condition)

#define apalDbgAssertMsg(condition, fmt, ...)                                 \

  (void)(condition);                                                          \

  (void)(fmt)

#define apalDbgPrintf(fmt, ...)                                               \

  (void)(fmt)

#endif /* (AMIROOS_CFG_DBG == true) */

/*============================================================================*/

/* GENERAL                                                                    */

/*============================================================================*/

/**

 * @brief Delay execution by a specific number of microseconds.

 *

 * @param[in]   us    Time to sleep until execution continues in microseconds.

 */

static inline void apalSleep(apalTime_t us)

{

  // check if the specified time can be represented by the system

  apalDbgAssert(us <= chTimeI2US(TIME_INFINITE));

  const sysinterval_t interval = chTimeUS2I(us);

  // TIME_IMMEDIATE makes no sense and would even cause system halt

  if (interval != TIME_IMMEDIATE) {

    chThdSleep(interval);

  }

  return;

}

/*============================================================================*/

/* GPIO                                                                       */

/*============================================================================*/

#if (HAL_USE_PAL == TRUE) || defined (__DOXYGEN__)

/**

 * @brief GPIO driver type.

 */

struct apalGpio_t {

  ioline_t line;

} PACKED_VAR;

/**

 * @brief Read the current value of a GPIO pin.

 *

 * @param[in]   gpio  GPIO to read.

 * @param[out]  val   Current value of the GPIO.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalGpioRead(apalGpio_t* gpio, apalGpioState_t* const val)

{

  apalDbgAssert(gpio != NULL);

  apalDbgAssert(val != NULL);

  *val = (palReadLine(gpio->line) == PAL_HIGH) ? APAL_GPIO_HIGH : APAL_GPIO_LOW;

  return APAL_STATUS_OK;

}

/**

 * @brief Set the value of a GPIO pin.

 *

 * @param[in] gpio  GPIO to write.

 * @param[in] val   Value to set for the GPIO.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalGpioWrite(apalGpio_t* gpio, const apalGpioState_t val)

{

  apalDbgAssert(gpio != NULL);

  // palWriteLine() is not guaranteed to be atomic, thus the scheduler is locked.

  syssts_t sysstatus = chSysGetStatusAndLockX();

  palWriteLine(gpio->line, (val == APAL_GPIO_HIGH) ? PAL_HIGH : PAL_LOW);

  chSysRestoreStatusX(sysstatus);

  return APAL_STATUS_OK;

}

/**

 * @brief Toggle the output of a GPIO.

 *

 * @param[in] gpio  GPIO to toggle.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalGpioToggle(apalGpio_t* gpio)

{

  apalDbgAssert(gpio != NULL);

  // palWriteLine() is not guaranteed to be atomic, thus the scheduler is locked.

  syssts_t sysstatus = chSysGetStatusAndLockX();

  palWriteLine(gpio->line, (palReadLine(gpio->line) == PAL_HIGH) ? PAL_LOW : PAL_HIGH);

  chSysRestoreStatusX(sysstatus);

  return APAL_STATUS_OK;

}

/**

 * @brief Return the interrupt enable status of the GPIO.

 *

 * @param[in]   gpio      GPIO to check.

 * @param[out]  enabled   Flag, indicating whether interrupt is enabled for the GPIO.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalGpioIsInterruptEnabled(apalGpio_t* gpio, bool* const enabled)

{

  apalDbgAssert(gpio != NULL);

  apalDbgAssert(enabled != NULL);

  *enabled = palIsLineEventEnabledX(gpio->line);

  return APAL_STATUS_OK;

}

/**

 * @brief Get the current on/off state of a control GPIO.

 *

 * @param[in]   gpio  Control GPIO to read.

 * @param[out]  val   Current activation status of the control GPIO.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalControlGpioGet(const apalControlGpio_t* const cgpio, apalControlGpioState_t* const val)

{

  apalDbgAssert(cgpio != NULL);

  apalDbgAssert(cgpio->gpio != NULL);

  apalDbgAssert(val != NULL);

  *val = ((palReadLine(cgpio->gpio->line) == PAL_HIGH) ^ (cgpio->meta.active == APAL_GPIO_ACTIVE_HIGH)) ? APAL_GPIO_OFF : APAL_GPIO_ON;

  return APAL_STATUS_OK;

}

/**

 * @brief Turn a control GPIO 'on' or 'off' respectively.

 *

 * @param[in] gpio  Control GPIO to set.

 * @param[in] val   Activation value to set for the control GPIO.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalControlGpioSet(const apalControlGpio_t* const cgpio, const apalControlGpioState_t val)

{

  apalDbgAssert(cgpio != NULL);

  apalDbgAssert(cgpio->gpio != NULL);

  apalDbgAssert(cgpio->meta.direction == APAL_GPIO_DIRECTION_OUTPUT || cgpio->meta.direction == APAL_GPIO_DIRECTION_BIDIRECTIONAL);

  // palWriteLine() is not guaranteed to be atomic, thus the scheduler is locked.

  syssts_t sysstatus = chSysGetStatusAndLockX();

  palWriteLine(cgpio->gpio->line, ((cgpio->meta.active == APAL_GPIO_ACTIVE_HIGH) ^ (val == APAL_GPIO_ON)) ? PAL_LOW : PAL_HIGH);

  chSysRestoreStatusX(sysstatus);

  return APAL_STATUS_OK;

}

/**

 * @brief   Converts an apalGpioEdge_t to an ChibiOS PAL edge.

 */

#define APAL2CH_EDGE(edge)                                            \

  ((edge == APAL_GPIO_EDGE_RISING) ? PAL_EVENT_MODE_RISING_EDGE :     \

    (edge == APAL_GPIO_EDGE_FALLING) ? PAL_EVENT_MODE_FALLING_EDGE :  \

     (edge == APAL_GPIO_EDGE_BOTH) ? PAL_EVENT_MODE_BOTH_EDGES :      \

      PAL_EVENT_MODE_DISABLED)

/**

 * @brief Enable or disable the interrupt event functionality.

 *

 * @param[in] cgpio   Control GPIO to set.

 * @param[in] enable  Flag, indicating whether the interrupt shall be activated (true) or deactivated (false).

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalControlGpioSetInterrupt(const apalControlGpio_t* const cgpio, const bool enable)

{

  apalDbgAssert(cgpio != NULL);

  apalDbgAssert(cgpio->gpio != NULL);

  if (enable) {

    apalDbgAssert(pal_lld_get_line_event(cgpio->gpio->line) != NULL);

    palEnableLineEvent(cgpio->gpio->line, APAL2CH_EDGE(cgpio->meta.edge));

  } else {

    palDisableLineEvent(cgpio->gpio->line);

  }

  return APAL_STATUS_OK;

}

#endif /* (HAL_USE_PAL == TRUE) */

/*============================================================================*/

/* PWM                                                                        */

/*============================================================================*/

#if (HAL_USE_PWM == TRUE) || defined (__DOXYGEN__)

/**

 * @brief PWM driver type.

 */

typedef PWMDriver apalPWMDriver_t;

/**

 * @brief   Set the PWM with given parameters.

 *

 * @param[in] pwm       PWM driver to set.

 * @param[in] channel   Channel of the PWM driver to set.

 * @param[in] width     Width to set the channel to.

 *

 * @return  The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalPWMSet(apalPWMDriver_t* pwm, const apalPWMchannel_t channel, const apalPWMwidth_t width)

{

  apalDbgAssert(pwm != NULL);

  pwmEnableChannel(pwm, (pwmchannel_t)channel, pwm->period * ((float)width / (float)APAL_PWM_WIDTH_MAX) + 0.5f);

  return APAL_STATUS_OK;

}

/**

 * @brief   Retrieve the current frequency of the PWM.

 *

 * @param[in]  pwm        PWM driver to read.

 * @param[out] frequency  The currently set frequency.

 *

 * @return  The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalPWMGetFrequency(apalPWMDriver_t* pwm, apalPWMfrequency_t* const frequency)

{

  apalDbgAssert(pwm != NULL);

  apalDbgAssert(frequency != NULL);

  *frequency = pwm->config->frequency;

  return APAL_STATUS_OK;

}

/**

 * @brief   Retrieve the current period of the PWM.

 *

 * @param[in]   pwm     PWM driver to read.

 * @param[out]  period  The currently set period.

 *

 * @return  The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalPWMGetPeriod(apalPWMDriver_t* pwm, apalPWMperiod_t* const period)

{

  apalDbgAssert(pwm != NULL);

  apalDbgAssert(period != NULL);

  *period = pwm->period;

  return APAL_STATUS_OK;

}

#endif /* (HAL_USE_PWM == TRUE) */

/*============================================================================*/

/* QEI                                                                        */

/*============================================================================*/

#if (HAL_USE_QEI == TRUE) || defined (__DOXYGEN__)

/**

 * @brief QEI driver type.

 */

typedef QEIDriver apalQEIDriver_t;

/**

 * @brief Gets the direction of the last transition.

 *

 * @param[in]   qei         The QEI driver to use.

 * @param[out]  direction   The direction of the last transition.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalQEIGetDirection(apalQEIDriver_t* qei, apalQEIDirection_t* const direction)

{

  apalDbgAssert(qei != NULL);

  apalDbgAssert(direction != NULL);

  *direction = (qei_lld_get_direction(qei)) ? APAL_QEI_DIRECTION_DOWN : APAL_QEI_DIRECTION_UP;

  return APAL_STATUS_OK;

}

/**

 * @brief Gets the current position of the ecnoder.

 *

 * @param[in]   qei       The QEI driver to use.

 * @param[out]  position  The current position of the encoder.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalQEIGetPosition(apalQEIDriver_t* qei, apalQEICount_t* const position)

{

  apalDbgAssert(qei != NULL);

  apalDbgAssert(position != NULL);

  *position = qei_lld_get_position(qei);

  return APAL_STATUS_OK;

}

/**

 * @brief Gets the value range of the encoder.

 *

 * @param[in]   qei     The QEI driver to use.

 * @param[out]  range   The value range of the encoder.

 *

 * @return The status indicates whether the function call was successful.

 */

static inline apalExitStatus_t apalQEIGetRange(apalQEIDriver_t* qei, apalQEICount_t* const range)

{

  apalDbgAssert(qei != NULL);

  apalDbgAssert(range != NULL);

  *range = qei_lld_get_range(qei);

  return APAL_STATUS_OK;

}

#endif /* (HAL_USE_QEI == TRUE) */

/*============================================================================*/

/* I2C                                                                        */

/*============================================================================*/

#if (HAL_USE_I2C == TRUE) || defined(__DOXYGEN__)

/**

 * @brief I2C driver type.

 */

typedef I2CDriver apalI2CDriver_t;

/**

 * @brief Transmit data and receive a response.

 *

 * @param[in]   i2cd      The I2C driver to use.

 * @param[in]   addr      Address to write to.

 * @param[in]   txbuf     Buffer containing data to send.

 * @param[in]   txbytes   Number of bytes to send.

 * @param[out]  rxbuf     Buffer to store a response to.

 * @param[in]   rxbytes   Number of bytes to receive.

 * @param[in]   timeout   Timeout for the function to return (in microseconds).

 *

 * @return The status indicates whether the function call was succesful or a timeout occurred.

 */

static inline apalExitStatus_t apalI2CMasterTransmit(apalI2CDriver_t* i2cd, const apalI2Caddr_t addr, const uint8_t* const txbuf, const size_t txbytes, uint8_t* const rxbuf, const size_t rxbytes, const apalTime_t timeout)

{

  apalDbgAssert(i2cd != NULL);

#if (I2C_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the I2C driver was locked externally

  const bool i2cd_locked_external = i2cd->mutex.owner == currp;

  if (!i2cd_locked_external) {

    i2cAcquireBus(i2cd);

  }

#endif /* (I2C_USE_MUTUAL_EXCLUSION == TRUE) */

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wtype-limits"

#if defined(STM32F1XX_I2C)

  // Due to a hardware limitation, for STM32F1 platform the minimum number of bytes that can be received is two.

  msg_t status = MSG_OK;

  if (rxbytes == 1) {

    uint8_t buffer[2];

    status = i2cMasterTransmitTimeout(i2cd, addr, txbuf, txbytes, buffer, 2, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

    rxbuf[0] = buffer[0];

  } else {

    status = i2cMasterTransmitTimeout(i2cd, addr, txbuf, txbytes, rxbuf, rxbytes, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

  }

#else /* defined(STM32F1XX_I2C) */

  const msg_t status = i2cMasterTransmitTimeout(i2cd, addr, txbuf, txbytes, rxbuf, rxbytes, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

#endif /* defined(STM32F1XX_I2C) */

#pragma GCC diagnostic pop

#if (I2C_USE_MUTUAL_EXCLUSION == TRUE)

  if (!i2cd_locked_external) {

    i2cReleaseBus(i2cd);

  }

#endif /* (I2C_USE_MUTUAL_EXCLUSION == TRUE) */

  switch (status)

  {

    case MSG_OK:

#if defined(STM32F1XX_I2C)

      return (rxbytes != 1) ? APAL_STATUS_OK : APAL_STATUS_WARNING;

#else /* defined(STM32F1XX_I2C) */

      return APAL_STATUS_OK;

#endif /* defined(STM32F1XX_I2C) */

    case MSG_TIMEOUT:

      return APAL_STATUS_TIMEOUT;

    case MSG_RESET:

    default:

      return APAL_STATUS_ERROR;

  }

}

/**

 * @brief Read data from a specific address.

 *

 * @param[in]   i2cd      The I2C driver to use.

 * @param[in]   addr      Address to read.

 * @param[out]  rxbuf     Buffer to store the response to.

 * @param[in]   rxbytes   Number of bytes to receive.

 * @param[in]   timeout   Timeout for the function to return (in microseconds).

 *

 * @return The status indicates whether the function call was succesful or a timeout occurred.

 */

static inline apalExitStatus_t apalI2CMasterReceive(apalI2CDriver_t* i2cd, const apalI2Caddr_t addr, uint8_t* const rxbuf, const size_t rxbytes, const apalTime_t timeout)

{

  apalDbgAssert(i2cd != NULL);

#if (I2C_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the I2C driver was locked externally

  const bool i2cd_locked_external = i2cd->mutex.owner == currp;

  if (!i2cd_locked_external) {

    i2cAcquireBus(i2cd);

  }

#endif /* (I2C_USE_MUTUAL_EXCLUSION == TRUE) */

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wtype-limits"

#if defined(STM32F1XX_I2C)

  // Due to a hardware limitation, for STM32F1 platform the minimum number of bytes that can be received is two.

  msg_t status = MSG_OK;

  if (rxbytes == 1) {

    uint8_t buffer[2];

    status = i2cMasterReceiveTimeout(i2cd, addr, buffer, 2, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

    rxbuf[0] = buffer[0];

  } else {

    status = i2cMasterReceiveTimeout(i2cd, addr, rxbuf, rxbytes, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

  }

#else /* defined(STM32F1XX_I2C) */

  const msg_t status = i2cMasterReceiveTimeout(i2cd, addr, rxbuf, rxbytes, ((timeout >= TIME_INFINITE) ? TIME_INFINITE : TIME_US2I(timeout)) );

#endif /* defined(STM32F1XX_I2C) */

#pragma GCC diagnostic pop

#if (I2C_USE_MUTUAL_EXCLUSION == TRUE)

  if (!i2cd_locked_external) {

    i2cReleaseBus(i2cd);

  }

#endif /* (I2C_USE_MUTUAL_EXCLUSION == TRUE) */

  switch (status)

  {

    case MSG_OK:

#if defined(STM32F1XX_I2C)

      return (rxbytes != 1) ? APAL_STATUS_OK : APAL_STATUS_WARNING;

#else /* defined(STM32F1XX_I2C) */

      return APAL_STATUS_OK;

#endif /* defined(STM32F1XX_I2C) */

    case MSG_TIMEOUT:

      return APAL_STATUS_TIMEOUT;

    case MSG_RESET:

    default:

      return APAL_STATUS_ERROR;

  }

}

#endif /* (HAL_USE_I2C == TRUE) */

/*============================================================================*/

/* SPI                                                                        */

/*============================================================================*/

#if (HAL_USE_SPI == TRUE) || defined(__DOXYGEN__)

/**

 * @brief SPI driver type.

 */

typedef SPIDriver apalSPIDriver_t;

/**

 * @brief SPI confguration type.

 */

typedef SPIConfig apalSPIConfig_t;

/**

 * @brief Reconfigure an SPI driver.

 *

 * @param[in] spid    The SPI driver to be reconfigured.

 * @param[in] config  Configuration to apply.

 *

 * @return The status indicates whether the function call was succesful.

 */

static inline apalExitStatus_t apalSPIReconfigure(apalSPIDriver_t* spid, const apalSPIConfig_t* config)

{

  apalDbgAssert(spid != NULL);

  apalDbgAssert(config != NULL);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the SPI driver was locked externally

  const bool spid_locked_external = spid->mutex.owner == currp;

  if (!spid_locked_external) {

    spiAcquireBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  spiStop(spid);

  spiStart(spid, config);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  if (!spid_locked_external) {

    spiReleaseBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  return APAL_STATUS_OK;

}

/**

 * @brief Transmit and receive data from SPI

 *

 * @param[in]   spid      The SPI driver to use.

 * @param[in]   txData    Buffer containing data to send.

 * @param[out]  rxData    Buffer to store.

 * @param[in]   length    Number of bytes to send.

 *

 * @return The status indicates whether the function call was succesful.

 */

static inline apalExitStatus_t apalSPIExchange(apalSPIDriver_t* spid, const uint8_t* const txData , uint8_t* const rxData, const size_t length)

{

  apalDbgAssert(spid != NULL);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the SPI driver was locked externally

  const bool spid_locked_external = spid->mutex.owner == currp;

  if (!spid_locked_external) {

    spiAcquireBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  spiSelect(spid);

  spiExchange(spid, length, txData, rxData);

  spiUnselect(spid);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  if (!spid_locked_external) {

    spiReleaseBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  return APAL_STATUS_OK;

}

/**

 * @brief Receive data from SPI

 *

 * @param[in]   spid      The SPI driver to use.

 * @param[out]  data      Buffer to store.

 * @param[in]   length    Number of bytes to send.

 *

 * @return The status indicates whether the function call was succesful.

 */

static inline apalExitStatus_t apalSPIReceive(apalSPIDriver_t* spid, uint8_t* const data, const size_t length)

{

  apalDbgAssert(spid != NULL);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the SPI driver was locked externally

  const bool spid_locked_external = spid->mutex.owner == currp;

  if (!spid_locked_external) {

    spiAcquireBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  spiSelect(spid);

  spiReceive(spid, length, data);

  spiUnselect(spid);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  if (!spid_locked_external) {

    spiReleaseBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  return APAL_STATUS_OK;

}

/**

 * @brief Transmit data to SPI

 *

 * @param[in]   spid      The SPI driver to use.

 * @param[in]   data      Buffer containing data to send.

 * @param[in]   length    Number of bytes to send.

 *

 * @return The status indicates whether the function call was succesful.

 */

static inline apalExitStatus_t apalSPITransmit(apalSPIDriver_t* spid, const uint8_t* const data, const size_t length)

{

  apalDbgAssert(spid != NULL);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the SPI driver was locked externally

  const bool spid_locked_external = spid->mutex.owner == currp;

  if (!spid_locked_external) {

    spiAcquireBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  spiSelect(spid);

  spiSend(spid, length, data);

  spiUnselect(spid);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  if (!spid_locked_external) {

    spiReleaseBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  return APAL_STATUS_OK;

}

/**

 * @brief Transmit data to SPI and receive data afterwards without releasing the bus in between.

 *

 * @param   spid        The SPI driver to use.

 * @param   txData      Transmit data buffer.

 * @param   rxData      Receive data buffer.

 * @param   txLength    Number of bytes to send.

 * @param   rxLength    Number of bytes to receive.

 *

 * @return The status indicates whether the function call was succesful.

 */

static inline apalExitStatus_t apalSPITransmitAndReceive(apalSPIDriver_t* spid, const uint8_t* const txData , uint8_t* const rxData, const size_t txLength, const size_t rxLength)

{

  apalDbgAssert(spid != NULL);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  // check whether the SPI driver was locked externally

  const bool spid_locked_external = spid->mutex.owner == currp;

  if (!spid_locked_external) {

    spiAcquireBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  spiSelect(spid);

  spiSend(spid, txLength, txData);

  spiReceive(spid, rxLength, rxData);

  spiUnselect(spid);

#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)

  if (!spid_locked_external) {

    spiReleaseBus(spid);

  }

#endif /* (SPI_USE_MUTUAL_EXCLUSION == TRUE) */

  return APAL_STATUS_OK;

}

#endif /* (HAL_USE_SPI == TRUE) */

#endif /* AMIROOS_PERIPHAL_H */