path: root/os/hal/ports/TIVA/LLD/UART/hal_serial_lld.c

/*
    Copyright (C) 2014..2017 Marco Veeneman

    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    UART/hal_serial_lld.c
 * @brief   Tiva low level serial driver code.
 *
 * @addtogroup SERIAL
 * @{
 */

#include "hal.h"

#if HAL_USE_SERIAL || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/** @brief UART0 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART0 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif

/** @brief UART1 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART1 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif

/** @brief UART2 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART2 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif

/** @brief UART3 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART3 || defined(__DOXYGEN__)
SerialDriver SD4;
#endif

/** @brief UART4 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART4 || defined(__DOXYGEN__)
SerialDriver SD5;
#endif

/** @brief UART5 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART5 || defined(__DOXYGEN__)
SerialDriver SD6;
#endif

/** @brief UART6 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART6 || defined(__DOXYGEN__)
SerialDriver SD7;
#endif

/** @brief UART7 serial driver identifier.*/
#if TIVA_SERIAL_USE_UART7 || defined(__DOXYGEN__)
SerialDriver SD8;
#endif

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

/** @brief Driver default configuration.*/
static const SerialConfig sd_default_config =
{
  SERIAL_DEFAULT_BITRATE,
  0,
  UART_LCRH_FEN | UART_LCRH_WLEN_8,
  UART_IFLS_TX4_8 | UART_IFLS_RX7_8,
  UART_CC_CS_SYSCLK
};

#if TIVA_SERIAL_USE_UART0 || defined(__DOXYGEN__)
/** @brief Input buffer for SD1.*/
static uint8_t sd_in_buf1[TIVA_SERIAL_UART0_IN_BUF_SIZE];

/** @brief Output buffer for SD1.*/
static uint8_t sd_out_buf1[TIVA_SERIAL_UART0_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART1 || defined(__DOXYGEN__)
/** @brief Input buffer for SD2.*/
static uint8_t sd_in_buf2[TIVA_SERIAL_UART1_IN_BUF_SIZE];

/** @brief Output buffer for SD2.*/
static uint8_t sd_out_buf2[TIVA_SERIAL_UART1_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART2 || defined(__DOXYGEN__)
/** @brief Input buffer for SD3.*/
static uint8_t sd_in_buf3[TIVA_SERIAL_UART2_IN_BUF_SIZE];

/** @brief Output buffer for SD3.*/
static uint8_t sd_out_buf3[TIVA_SERIAL_UART2_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART3 || defined(__DOXYGEN__)
/** @brief Input buffer for SD4.*/
static uint8_t sd_in_buf4[TIVA_SERIAL_UART3_IN_BUF_SIZE];

/** @brief Output buffer for SD4.*/
static uint8_t sd_out_buf4[TIVA_SERIAL_UART3_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART4 || defined(__DOXYGEN__)
/** @brief Input buffer for SD5.*/
static uint8_t sd_in_buf5[TIVA_SERIAL_UART4_IN_BUF_SIZE];

/** @brief Output buffer for SD5.*/
static uint8_t sd_out_buf5[TIVA_SERIAL_UART4_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART5 || defined(__DOXYGEN__)
/** @brief Input buffer for SD6.*/
static uint8_t sd_in_buf6[TIVA_SERIAL_UART5_IN_BUF_SIZE];

/** @brief Output buffer for SD6.*/
static uint8_t sd_out_buf6[TIVA_SERIAL_UART5_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART6 || defined(__DOXYGEN__)
/** @brief Input buffer for SD7.*/
static uint8_t sd_in_buf7[TIVA_SERIAL_UART6_IN_BUF_SIZE];

/** @brief Output buffer for SD7.*/
static uint8_t sd_out_buf7[TIVA_SERIAL_UART6_OUT_BUF_SIZE];
#endif

#if TIVA_SERIAL_USE_UART7 || defined(__DOXYGEN__)
/** @brief Input buffer for SD8.*/
static uint8_t sd_in_buf8[TIVA_SERIAL_UART7_IN_BUF_SIZE];

/** @brief Output buffer for SD8.*/
static uint8_t sd_out_buf8[TIVA_SERIAL_UART7_OUT_BUF_SIZE];
#endif

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/**
 * @brief   UART initialization.
 *
 * @param[in] sdp       pointer to a @p SerialDriver object
 * @param[in] config    the architecture-dependent serial driver configuration
 */
static void uart_init(SerialDriver *sdp, const SerialConfig *config)
{
  uint32_t u = sdp->uart;
  uint32_t brd;
  uint32_t speed = config->speed;
  uint32_t clock_source;

  if (config->ctl & UART_CTL_HSE) {
    /* High speed mode is enabled, half the baud rate to compensate
     * for high speed mode.*/
    speed = (speed + 1) / 2;
  }

  if ((config->cc & UART_CC_CS_SYSCLK) == UART_CC_CS_SYSCLK) {
    /* UART is clocked using the SYSCLK.*/
    clock_source = TIVA_SYSCLK * 8;
  }
  else {
    /* UART is clocked using the PIOSC.*/
    clock_source = 16000000 * 8;
  }

  /* Calculate the baud rate divisor */
  brd = ((clock_source / speed) + 1) / 2;

  /* Disable UART.*/
  HWREG(u + UART_O_CTL) &= ~UART_CTL_UARTEN;

  /* Set baud rate.*/
  HWREG(u + UART_O_IBRD) = brd / 64;
  HWREG(u + UART_O_FBRD) = brd % 64;

  /* Line control/*/
  HWREG(u + UART_O_LCRH) = config->lcrh;

  /* Select clock source.*/
  HWREG(u + UART_O_CC) = config->cc & UART_CC_CS_M;

  /* FIFO configuration.*/
  HWREG(u + UART_O_IFLS) = config->ifls & (UART_IFLS_RX_M | UART_IFLS_TX_M);

  /* Note that some bits are enforced.*/
  HWREG(u + UART_O_CTL)  = config->ctl | UART_CTL_RXE | UART_CTL_TXE | UART_CTL_UARTEN;

  /* Enable interrupts.*/
  HWREG(u + UART_O_IM)   = UART_IM_RXIM | UART_IM_TXIM | UART_IM_RTIM;
}

/**
 * @brief   UART de-initialization.
 *
 * @param[in] u         pointer to an UART I/O block
 */
static void uart_deinit(uint32_t u)
{
  HWREG(u + UART_O_CTL) &= ~UART_CTL_UARTEN;
}

/**
 * @brief   Error handling routine.
 *
 * @param[in] sdp       communication channel associated to the UART
 * @param[in] err       UART LSR register value
 */
static void set_error(SerialDriver *sdp, uint16_t err)
{
  eventflags_t sts = 0;
  
  if (err & UART_MIS_FEMIS)
    sts |= SD_FRAMING_ERROR;
  if (err & UART_MIS_PEMIS)
    sts |= SD_PARITY_ERROR;
  if (err & UART_MIS_BEMIS)
    sts |= SD_BREAK_DETECTED;
  if (err & UART_MIS_OEMIS)
    sts |= SD_OVERRUN_ERROR;
  osalSysLockFromISR();
  chnAddFlagsI(sdp, sts);
  osalSysUnlockFromISR();
}

/**
 * @brief   Common IRQ handler.
 * @note    Tries hard to clear all the pending interrupt sources, we don't
 *          want to go through the whole ISR and have another interrupt soon
 *          after.
 *
 * @param[in] u         pointer to an UART I/O block
 * @param[in] sdp       communication channel associated to the UART
 */
static void serial_serve_interrupt(SerialDriver *sdp) 
{
  uint32_t u = sdp->uart;
  uint16_t mis = HWREG(u + UART_O_MIS);
  
  HWREG(u + UART_O_ICR) = mis;		/* clear interrupts */

  if (mis & (UART_MIS_FEMIS | UART_MIS_PEMIS | UART_MIS_BEMIS | UART_MIS_OEMIS)) {
    set_error(sdp, mis);
  }

  if ((mis & UART_MIS_RXMIS) || (mis &  UART_MIS_RTMIS)) {
    osalSysLockFromISR();
    if (iqIsEmptyI(&sdp->iqueue)) {
      chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
    }
    osalSysUnlockFromISR();
    while ((HWREG(u + UART_O_FR) & UART_FR_RXFE) == 0) {
      osalSysLockFromISR();
      if (iqPutI(&sdp->iqueue, HWREG(u + UART_O_DR)) < Q_OK) {
        chnAddFlagsI(sdp, SD_QUEUE_FULL_ERROR);
      }
      osalSysUnlockFromISR();
    }
  }

  if (mis & UART_MIS_TXMIS) {
    while ((HWREG(u + UART_O_FR) & UART_FR_TXFF) == 0) {
      msg_t b;
      osalSysLockFromISR();
      b = oqGetI(&sdp->oqueue);
      osalSysUnlockFromISR();
      if (b < Q_OK) {
        HWREG(u + UART_O_IM) &= ~UART_IM_TXIM;
        osalSysLockFromISR();
        chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
        osalSysUnlockFromISR();
        break;
      }
      HWREG(u + UART_O_DR) = b;
    }
  }

  /* TODO: Physical transmission end. */
}

/**
 * @brief   Fill the hardware FIFO of a UART.
 */
static void fifo_load(SerialDriver *sdp)
{
  uint32_t u = sdp->uart;

  while ((HWREG(u + UART_O_FR) & UART_FR_TXFF) == 0) {
    msg_t b = oqGetI(&sdp->oqueue);
    if (b < Q_OK) {
      chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
      return;
    }
    HWREG(u + UART_O_DR) = b;
  }

  HWREG(u + UART_O_IM) |= UART_IM_TXIM;   /* transmit interrupt enable */
}

/**
 * @brief   Driver SD1 output notification.
 */
#if TIVA_SERIAL_USE_UART0 || defined(__DOXYGEN__)
static void notify1(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD1);
}
#endif

/**
 * @brief   Driver SD2 output notification.
 */
#if TIVA_SERIAL_USE_UART1 || defined(__DOXYGEN__)
static void notify2(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD2);
}
#endif

/**
 * @brief   Driver SD3 output notification.
 */
#if TIVA_SERIAL_USE_UART2 || defined(__DOXYGEN__)
static void notify3(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD3);
}
#endif

/**
 * @brief   Driver SD4 output notification.
 */
#if TIVA_SERIAL_USE_UART3 || defined(__DOXYGEN__)
static void notify4(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD4);
}
#endif

/**
 * @brief   Driver SD5 output notification.
 */
#if TIVA_SERIAL_USE_UART4 || defined(__DOXYGEN__)
static void notify5(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD5);
}
#endif

/**
 * @brief   Driver SD6 output notification.
 */
#if TIVA_SERIAL_USE_UART5 || defined(__DOXYGEN__)
static void notify6(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD6);
}
#endif

/**
 * @brief   Driver SD7 output notification.
 */
#if TIVA_SERIAL_USE_UART6 || defined(__DOXYGEN__)
static void notify7(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD7);
}
#endif

/**
 * @brief   Driver SD8 output notification.
 */
#if TIVA_SERIAL_USE_UART7 || defined(__DOXYGEN__)
static void notify8(io_queue_t *qp)
{
  (void)qp;
  fifo_load(&SD8);
}
#endif

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

#if TIVA_SERIAL_USE_UART0 || defined(__DOXYGEN__)
#if !defined(TIVA_UART0_HANDLER)
#error "TIVA_UART0_HANDLER not defined"
#endif
/**
 * @brief   UART0 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART0_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD1);

  CH_IRQ_EPILOGUE();
}
#endif


#if TIVA_SERIAL_USE_UART1 || defined(__DOXYGEN__)
#if !defined(TIVA_UART1_HANDLER)
#error "TIVA_UART1_HANDLER not defined"
#endif
/**
 * @brief   UART1 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART1_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD2);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART2 || defined(__DOXYGEN__)
#if !defined(TIVA_UART2_HANDLER)
#error "TIVA_UART2_HANDLER not defined"
#endif
/**
 * @brief   UART2 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART2_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD3);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART3 || defined(__DOXYGEN__)
#if !defined(TIVA_UART3_HANDLER)
#error "TIVA_UART3_HANDLER not defined"
#endif
/**
 * @brief   UART3 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART3_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD4);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART4 || defined(__DOXYGEN__)
#if !defined(TIVA_UART4_HANDLER)
#error "TIVA_UART4_HANDLER not defined"
#endif
/**
 * @brief   UART4 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART4_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD5);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART5 || defined(__DOXYGEN__)
#if !defined(TIVA_UART5_HANDLER)
#error "TIVA_UART5_HANDLER not defined"
#endif
/**
 * @brief   UART5 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART5_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD6);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART6 || defined(__DOXYGEN__)
#if !defined(TIVA_UART6_HANDLER)
#error "TIVA_UART6_HANDLER not defined"
#endif
/**
 * @brief   UART6 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART6_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD7);

  CH_IRQ_EPILOGUE();
}
#endif

#if TIVA_SERIAL_USE_UART7 || defined(__DOXYGEN__)
#if !defined(TIVA_UART7_HANDLER)
#error "TIVA_UART7_HANDLER not defined"
#endif
/**
 * @brief   UART7 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(TIVA_UART7_HANDLER)
{
  CH_IRQ_PROLOGUE();

  serial_serve_interrupt(&SD8);

  CH_IRQ_EPILOGUE();
}
#endif

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   Low level serial driver initialization.
 *
 * @notapi
 */
void sd_lld_init(void)
{
#if TIVA_SERIAL_USE_UART0
  sdObjectInit(&SD1);
  iqObjectInit(&SD1.iqueue, sd_in_buf1, sizeof sd_in_buf1, NULL, &SD1);
  oqObjectInit(&SD1.oqueue, sd_out_buf1, sizeof sd_out_buf1, notify1, &SD1);
  SD1.uart = UART0_BASE;
#endif

#if TIVA_SERIAL_USE_UART1
  sdObjectInit(&SD2);
  iqObjectInit(&SD2.iqueue, sd_in_buf2, sizeof sd_in_buf2, NULL, &SD2);
  oqObjectInit(&SD2.oqueue, sd_out_buf2, sizeof sd_out_buf2, notify2, &SD2);
  SD2.uart = UART1_BASE;
#endif

#if TIVA_SERIAL_USE_UART2
  sdObjectInit(&SD3);
  iqObjectInit(&SD3.iqueue, sd_in_buf3, sizeof sd_in_buf3, NULL, &SD3);
  oqObjectInit(&SD3.oqueue, sd_out_buf3, sizeof sd_out_buf3, notify3, &SD3);
  SD3.uart = UART2_BASE;
#endif

#if TIVA_SERIAL_USE_UART3
  sdObjectInit(&SD4);
  iqObjectInit(&SD4.iqueue, sd_in_buf4, sizeof sd_in_buf4, NULL, &SD4);
  oqObjectInit(&SD4.oqueue, sd_out_buf4, sizeof sd_out_buf4, notify4, &SD4);
  SD4.uart = UART3_BASE;
#endif

#if TIVA_SERIAL_USE_UART4
  sdObjectInit(&SD5);
  iqObjectInit(&SD5.iqueue, sd_in_buf5, sizeof sd_in_buf5, NULL, &SD5);
  oqObjectInit(&SD5.oqueue, sd_out_buf5, sizeof sd_out_buf5, notify5, &SD5);
  SD5.uart = UART4_BASE;
#endif

#if TIVA_SERIAL_USE_UART5
  sdObjectInit(&SD6);
  iqObjectInit(&SD6.iqueue, sd_in_buf6, sizeof sd_in_buf6, NULL, &SD6);
  oqObjectInit(&SD6.oqueue, sd_out_buf6, sizeof sd_out_buf6, notify6, &SD6);
  SD6.uart = UART5_BASE;
#endif

#if TIVA_SERIAL_USE_UART6
  sdObjectInit(&SD7);
  iqObjectInit(&SD7.iqueue, sd_in_buf7, sizeof sd_in_buf7, NULL, &SD7);
  oqObjectInit(&SD7.oqueue, sd_out_buf7, sizeof sd_out_buf7, notify7, &SD7);
  SD7.uart = UART6_BASE;
#endif

#if TIVA_SERIAL_USE_UART7
  sdObjectInit(&SD8);
  iqObjectInit(&SD8.iqueue, sd_in_buf8, sizeof sd_in_buf8, NULL, &SD8);
  oqObjectInit(&SD8.oqueue, sd_out_buf8, sizeof sd_out_buf8, notify8, &SD8);
  SD8.uart = UART7_BASE;
#endif
}

/**
 * @brief   Low level serial driver configuration and (re)start.
 *
 * @param[in] sdp       pointer to a @p SerialDriver object
 * @param[in] config    the architecture-dependent serial driver configuration.
 *                      If this parameter is set to @p NULL then a default
 *                      configuration is used.
 *
 * @notapi
 */
void sd_lld_start(SerialDriver *sdp, const SerialConfig *config)
{
  if (config == NULL)
    config = &sd_default_config;

  if (sdp->state == SD_STOP) {
#if TIVA_SERIAL_USE_UART0
    if (&SD1 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 0);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 0)))
        ;

      nvicEnableVector(TIVA_UART0_NUMBER, TIVA_SERIAL_UART0_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART1
    if (&SD2 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 1);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 1)))
        ;

      nvicEnableVector(TIVA_UART1_NUMBER, TIVA_SERIAL_UART1_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART2
    if (&SD3 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 2);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 2)))
        ;

      nvicEnableVector(TIVA_UART2_NUMBER, TIVA_SERIAL_UART2_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART3
    if (&SD4 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 3);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 3)))
        ;

      nvicEnableVector(TIVA_UART3_NUMBER, TIVA_SERIAL_UART3_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART4
    if (&SD5 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 4);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 4)))
        ;

      nvicEnableVector(TIVA_UART4_NUMBER, TIVA_SERIAL_UART4_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART5
    if (&SD6 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 5);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 5)))
        ;

      nvicEnableVector(TIVA_UART5_NUMBER, TIVA_SERIAL_UART5_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART6
    if (&SD7 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 6);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 6)))
        ;

      nvicEnableVector(TIVA_UART6_NUMBER, TIVA_SERIAL_UART6_PRIORITY);
    }
#endif
#if TIVA_SERIAL_USE_UART7
    if (&SD8 == sdp) {
      HWREG(SYSCTL_RCGCUART) |= (1 << 7);

      while (!(HWREG(SYSCTL_PRUART) & (1 << 7)))
        ;

      nvicEnableVector(TIVA_UART7_NUMBER, TIVA_SERIAL_UART7_PRIORITY);
    }
#endif
  }
  uart_init(sdp, config);
}

/**
 * @brief   Low level serial driver stop.
 * @details De-initializes the UART, stops the associated clock, resets the
 *          interrupt vector.
 *
 * @param[in] sdp       pointer to a @p SerialDriver object
 *
 * @notapi
 */
void sd_lld_stop(SerialDriver *sdp)
{
  if (sdp->state == SD_READY) {
    uart_deinit(sdp->uart);
#if TIVA_SERIAL_USE_UART0
    if (&SD1 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 0);  /* disable UART0 module */
      nvicDisableVector(TIVA_UART0_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART1
    if (&SD2 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 1);  /* disable UART1 module */
      nvicDisableVector(TIVA_UART1_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART2
    if (&SD3 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 2);  /* disable UART2 module */
      nvicDisableVector(TIVA_UART2_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART3
    if (&SD4 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 3);  /* disable UART3 module */
      nvicDisableVector(TIVA_UART3_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART4
    if (&SD5 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 4);  /* disable UART4 module */
      nvicDisableVector(TIVA_UART4_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART5
    if (&SD6 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 5);  /* disable UART5 module */
      nvicDisableVector(TIVA_UART5_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART6
    if (&SD7 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 6);  /* disable UART6 module */
      nvicDisableVector(TIVA_UART6_NUMBER);
      return;
    }
#endif
#if TIVA_SERIAL_USE_UART7
    if (&SD8 == sdp) {
      HWREG(SYSCTL_RCGCUART) &= ~(1 << 7);  /* disable UART7 module */
      nvicDisableVector(TIVA_UART7_NUMBER);
      return;
    }
#endif
  }
}

#endif /* CH_HAL_USE_SERIAL */

/** @} */