tinySA/os/hal/platforms/STM8L/serial_lld.h

/*
    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

/**
 * @file    STM8L/serial_lld.h
 * @brief   STM8L low level serial driver header.
 *
 * @addtogroup SERIAL
 * @{
 */

#ifndef _SERIAL_LLD_H_
#define _SERIAL_LLD_H_

#if HAL_USE_SERIAL || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

#define SD_MODE_PARITY          0x07        /**< @brief Parity field mask.  */
#define SD_MODE_PARITY_NONE     0x00        /**< @brief No parity.          */
#define SD_MODE_PARITY_EVEN     0x05        /**< @brief Even parity.        */
#define SD_MODE_PARITY_ODD      0x07        /**< @brief Odd parity.         */

#define SD_MODE_STOP            0x30        /**< @brief Stop bits mask.     */
#define SD_MODE_STOP_1          0x00        /**< @brief One stop bit.       */
#define SD_MODE_STOP_2          0x20        /**< @brief Two stop bits.      */
#define SD_MODE_STOP_1P5        0x30        /**< @brief 1.5 stop bits.      */

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @brief   USART1 driver enable switch.
 * @details If set to @p TRUE the support for USART1 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM8L_SERIAL_USE_USART1) || defined(__DOXYGEN__)
#define STM8L_SERIAL_USE_USART1     TRUE
#endif

/**
 * @brief   USART2 driver enable switch.
 * @details If set to @p TRUE the support for USART3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM8L_SERIAL_USE_USART2) || defined(__DOXYGEN__)
#define STM8L_SERIAL_USE_USART2     TRUE
#endif

/**
 * @brief   USART3 driver enable switch.
 * @details If set to @p TRUE the support for USART3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM8L_SERIAL_USE_USART3) || defined(__DOXYGEN__)
#define STM8L_SERIAL_USE_USART3     TRUE
#endif

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

#if STM8L_SERIAL_USE_USART1 && !STM8L_HAS_USART1
#error "USART1 not present in the selected device"
#endif

#if STM8L_SERIAL_USE_USART2 && !STM8L_HAS_USART2
#error "USART2 not present in the selected device"
#endif

#if STM8L_SERIAL_USE_USART3 && !STM8L_HAS_USART3
#error "USART3 not present in the selected device"
#endif

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Generic Serial Driver configuration structure.
 * @details An instance of this structure must be passed to @p sdStart()
 *          in order to configure and start a serial driver operations.
 * @note    This structure content is architecture dependent, each driver
 *          implementation defines its own version and the custom static
 *          initializers.
 */
typedef struct {
  /**
   * @brief Bit rate register.
   */
  uint16_t                  sc_brr;
  /**
   * @brief Mode flags.
   */
  uint8_t                   sc_mode;
} SerialConfig;

/**
 * @brief   @p SerialDriver specific data.
 */
#define _serial_driver_data                                                 \
  _base_asynchronous_channel_data                                           \
  /* Driver state.*/                                                        \
  sdstate_t                 state;                                          \
  /* Input queue.*/                                                         \
  InputQueue                iqueue;                                         \
  /* Output queue.*/                                                        \
  OutputQueue               oqueue;                                         \
  /* Input circular buffer.*/                                               \
  uint8_t                   ib[SERIAL_BUFFERS_SIZE];                        \
  /* Output circular buffer.*/                                              \
  uint8_t                   ob[SERIAL_BUFFERS_SIZE];                        \
  /* End of the mandatory fields.*/                                         \
  USART_TypeDef             *usart;

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/**
 * @brief   Macro for baud rate computation.
 * @note    Make sure the final baud rate is within tolerance.
 */
#define BRR(b) (SYSCLK / (b))

#if STM8L_SERIAL_USE_USART1 || defined(__DOXYGEN__)
/**
 * @brief USART1 RX interrupt handler segment.
 */
#define _USART1_RECEIVE_ISR() {                                             \
  uint8_t sr = USART1->SR;                                                  \
  if (sr & (USART_SR_RXNE | USART_SR_OR | USART_SR_NF |                     \
            USART_SR_FE | USART_SR_PE)) {                                   \
    if (sr & (USART_SR_OR | USART_SR_NF | USART_SR_FE | USART_SR_PE))       \
      sd_lld_set_error(&SD1, sr);                                           \
    chSysLockFromIsr();                                                     \
    sdIncomingDataI(&SD1, USART1->DR);                                      \
    chSysUnlockFromIsr();                                                   \
  }                                                                         \
}

/**
 * @brief USART1 TX interrupt handler segment.
 */
#define _USART1_TRANSMIT_ISR() {                                            \
  if (USART1->SR & USART_SR_TXE) {                                          \
    msg_t b;                                                                \
    chSysLockFromIsr();                                                     \
    b = sdRequestDataI(&SD1);                                               \
    chSysUnlockFromIsr();                                                   \
    if (b < Q_OK)                                                           \
      USART1->CR2 &= (uint8_t)~USART_CR2_TIEN;                              \
    else                                                                    \
      USART1->DR = (uint8_t)b;                                              \
  }                                                                         \
}
#endif /* STM8L_SERIAL_USE_USART1 */

#if STM8L_SERIAL_USE_USART2 || defined(__DOXYGEN__)
/**
 * @brief USART2 RX interrupt handler segment.
 */
#define _USART2_RECEIVE_ISR() {                                             \
  uint8_t sr = USART2->SR;                                                  \
  if (sr & (USART_SR_RXNE | USART_SR_OR | USART_SR_NF |                     \
            USART_SR_FE | USART_SR_PE)) {                                   \
    if (sr & (USART_SR_OR | USART_SR_NF | USART_SR_FE | USART_SR_PE))       \
      sd_lld_set_error(&SD2, sr);                                           \
    chSysLockFromIsr();                                                     \
    sdIncomingDataI(&SD2, USART2->DR);                                      \
    chSysUnlockFromIsr();                                                   \
  }                                                                         \
}

/**
 * @brief USART2 TX interrupt handler segment.
 */
#define _USART2_TRANSMIT_ISR() {                                            \
  if (USART2->SR & USART_SR_TXE) {                                          \
    msg_t b;                                                                \
    chSysLockFromIsr();                                                     \
    b = sdRequestDataI(&SD2);                                               \
    chSysUnlockFromIsr();                                                   \
    if (b < Q_OK)                                                           \
      USART2->CR2 &= (uint8_t)~USART_CR2_TIEN;                              \
    else                                                                    \
      USART2->DR = (uint8_t)b;                                              \
  }                                                                         \
}
#endif /* STM8L_SERIAL_USE_USART2 */

#if STM8L_SERIAL_USE_USART3 || defined(__DOXYGEN__)
/**
 * @brief USART3 RX interrupt handler segment.
 */
#define _USART3_RECEIVE_ISR() {                                             \
  uint8_t sr = USART3->SR;                                                  \
  if (sr & (USART_SR_RXNE | USART_SR_OR | USART_SR_NF |                     \
            USART_SR_FE | USART_SR_PE)) {                                   \
    if (sr & (USART_SR_OR | USART_SR_NF | USART_SR_FE | USART_SR_PE))       \
      sd_lld_set_error(&SD3, sr);                                           \
    chSysLockFromIsr();                                                     \
    sdIncomingDataI(&SD3, USART3->DR);                                      \
    chSysUnlockFromIsr();                                                   \
  }                                                                         \
}

/**
 * @brief USART3 TX interrupt handler segment.
 */
#define _USART3_TRANSMIT_ISR() {                                            \
  if (USART3->SR & USART_SR_TXE) {                                          \
    msg_t b;                                                                \
    chSysLockFromIsr();                                                     \
    b = sdRequestDataI(&SD3);                                               \
    chSysUnlockFromIsr();                                                   \
    if (b < Q_OK)                                                           \
      USART3->CR2 &= (uint8_t)~USART_CR2_TIEN;                              \
    else                                                                    \
      USART3->DR = (uint8_t)b;                                              \
  }                                                                         \
}
#endif /* STM8L_SERIAL_USE_USART3 */

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if STM8L_SERIAL_USE_USART1 && !defined(__DOXYGEN__)
extern SerialDriver SD1;
#endif
#if STM8L_SERIAL_USE_USART2 && !defined(__DOXYGEN__)
extern SerialDriver SD2;
#endif
#if STM8L_SERIAL_USE_USART3 && !defined(__DOXYGEN__)
extern SerialDriver SD3;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void sd_lld_init(void);
  void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);
  void sd_lld_stop(SerialDriver *sdp);
  void sd_lld_set_error(SerialDriver *sdp, uint8_t sr);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_SERIAL */

#endif /* _SERIAL_LLD_H_ */

/** @} */