tinySA/os/hal/platforms/SPC5xx/SIUL_v1/pal_lld.c

/*
 * Licensed under ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
 *
 * 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    SPC5xx/SIUL_v1/pal_lld.c
 * @brief   SPC5xx SIUL low level driver code.
 *
 * @addtogroup PAL
 * @{
 */

#include "ch.h"
#include "hal.h"

#if HAL_USE_PAL || defined(__DOXYGEN__)

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

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

/*===========================================================================*/
/* Driver local variables and types.                                         */
/*===========================================================================*/

#if defined(SPC5_SIUL_SYSTEM_PINS)
static const unsigned system_pins[] = {SPC5_SIUL_SYSTEM_PINS};
#endif

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

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

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

/**
 * @brief   SPC5xx I/O ports configuration.
 *
 * @param[in] config    the STM32 ports configuration
 *
 * @notapi
 */
void _pal_lld_init(const PALConfig *config) {
  unsigned i;

#if defined(SPC5_SIUL_PCTL)
  /* SIUL clock gating if present.*/
  halSPCSetPeripheralClockMode(SPC5_SIUL_PCTL,
                               SPC5_ME_PCTL_RUN(2) | SPC5_ME_PCTL_LP(2));
#endif

  /* Initialize PCR registers for undefined pads.*/
  for (i = 0; i < SPC5_SIUL_NUM_PCRS; i++) {
#if defined(SPC5_SIUL_SYSTEM_PINS)
    /* Handling the case where some SIU pins are not meant to be reprogrammed,
       for example JTAG pins.*/
    unsigned j;
    for (j = 0; j < sizeof system_pins; j++) {
      if (i == system_pins[j])
        goto skip;
    }
    SIU.PCR[i].R = config->default_mode;
skip:
    ;
#else
    SIU.PCR[i].R = config->default_mode;
#endif
  }

  /* Initialize PADSEL registers.*/
  for (i = 0; i < SPC5_SIUL_NUM_PADSELS; i++)
    SIU.PSMI[i].R = config->padsels[i];

  /* Initialize PCR registers for defined pads.*/
  i = 0;
  while (config->inits[i].pcr_value != 0) {
    SIU.GPDO[config->inits[i].pcr_index].R = config->inits[i].gpdo_value;
    SIU.PCR[config->inits[i].pcr_index].R  = config->inits[i].pcr_value;
    i++;
  }
}

/**
 * @brief   Reads a group of bits.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    group bit offset within the port
 * @return              The group logical states.
 *
 * @notapi
 */
ioportmask_t _pal_lld_readgroup(ioportid_t port,
                                ioportmask_t mask,
                                uint_fast8_t offset) {

  (void)port;
  (void)mask;
  (void)offset;
  return 0;
}

/**
 * @brief   Writes a group of bits.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    group bit offset within the port
 * @param[in] bits      bits to be written. Values exceeding the group width
 *                      are masked.
 *
 * @notapi
 */
void _pal_lld_writegroup(ioportid_t port,
                         ioportmask_t mask,
                         uint_fast8_t offset,
                         ioportmask_t bits) {

  (void)port;
  (void)mask;
  (void)offset;
  (void)bits;
}

/**
 * @brief   Pads mode setup.
 * @details This function programs a pads group belonging to the same port
 *          with the specified mode.
 *
 * @param[in] port      the port identifier
 * @param[in] mask      the group mask
 * @param[in] mode      the mode
 *
 * @notapi
 */
void _pal_lld_setgroupmode(ioportid_t port,
                           ioportmask_t mask,
                           iomode_t mode) {
  unsigned pcr_index = (unsigned)(port * PAL_IOPORTS_WIDTH);
  ioportmask_t m1 = 0x8000;
  while (m1) {
    if (mask & m1)
      SIU.PCR[pcr_index].R = mode;
    m1 >>= 1;
    ++pcr_index;
  }
}

#endif /* HAL_USE_PAL */

/** @} */