File content as of revision 2:52d3392d33d3:

/**
 ******************************************************************************
 * @file    stm_divider_api.c
 * @author  AST / Software Platforms and Cloud
 * @version V1.0
 * @date    November 8th, 2016
 * @brief   Utilities header file for the X_NUCLEO_CCA02M1 expansion board.
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************
 */


/* Includes ------------------------------------------------------------------*/

#include "cmsis.h"
#include "stm_divider_api.h"
#include "component_def.h"


/* Variables -----------------------------------------------------------------*/

static TIM_HandleTypeDef TimDividerHandle;
static TIM_SlaveConfigTypeDef sSlaveConfig;
static TIM_IC_InitTypeDef sICConfig;
static TIM_OC_InitTypeDef sOCConfig;


/* Functions -----------------------------------------------------------------*/

/**
 * @brief  Initializing timer.
 * @param  None.
 * @retval 0 in case of success, -1 otherwise.
 */
uint8_t ST_Timer_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  
  /* Enable AUDIO_TIMER clock*/
  AUDIO_IN_TIMER_CLK_ENABLE();
  AUDIO_IN_TIMER_CHOUT_GPIO_PORT_CLK_ENABLE();
  AUDIO_IN_TIMER_CHIN_GPIO_PORT_CLK_ENABLE();
  
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  
  GPIO_InitStruct.Alternate = AUDIO_IN_TIMER_CHIN_AF;
  GPIO_InitStruct.Pin = AUDIO_IN_TIMER_CHIN_PIN;
  HAL_GPIO_Init(AUDIO_IN_TIMER_CHIN_GPIO_PORT, &GPIO_InitStruct);
  
  GPIO_InitStruct.Alternate = AUDIO_IN_TIMER_CHOUT_AF;
  GPIO_InitStruct.Pin = AUDIO_IN_TIMER_CHOUT_PIN;
  HAL_GPIO_Init(AUDIO_IN_TIMER_CHOUT_GPIO_PORT, &GPIO_InitStruct);
  
  TimDividerHandle.Instance = AUDIO_IN_TIMER;
  
  /* Configure the Input: channel_1 */
  sICConfig.ICPolarity  = TIM_ICPOLARITY_RISING;
  sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
  sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
  sICConfig.ICFilter = 0;
  if (HAL_TIM_IC_ConfigChannel(&TimDividerHandle, &sICConfig, TIM_CHANNEL_1) != HAL_OK)
  {
    return -1;
  }
  
  /* Configure TIM1 in Gated Slave mode for the external trigger (Filtered Timer
  Input 1) */
  sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
  sSlaveConfig.SlaveMode    = TIM_SLAVEMODE_EXTERNAL1;
  if (HAL_TIM_SlaveConfigSynchronization(&TimDividerHandle, &sSlaveConfig) != HAL_OK)
  {
    return -1;
  }
  
  /* Initialize TIM3 peripheral in PWM mode*/
  TimDividerHandle.Init.Period            = 1;
  TimDividerHandle.Init.Prescaler         = 0;
  TimDividerHandle.Init.ClockDivision     = 0;
  TimDividerHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
  TimDividerHandle.Init.RepetitionCounter = 0;
  if (HAL_TIM_PWM_Init(&TimDividerHandle) != HAL_OK)
  {
    return -1;
  }
  
  /* Configure the PWM_channel_1  */
  sOCConfig.OCMode     = TIM_OCMODE_PWM1;
  sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
  sOCConfig.Pulse = 1;
  if (HAL_TIM_PWM_ConfigChannel(&TimDividerHandle, &sOCConfig, TIM_CHANNEL_2) != HAL_OK)
  {
    return -1;
  }

  return 0;
}

/**
* @brief  Starting timer.
* @param  None.
* @retval 0 in case of success, -1 otherwise.
*/
uint8_t ST_Timer_Start(void)
{
  if (HAL_TIM_IC_Start(&TimDividerHandle, TIM_CHANNEL_1) != HAL_OK)
  {
    return -1;
  }
  /* Start the Output Compare */
  if (HAL_TIM_OC_Start(&TimDividerHandle, TIM_CHANNEL_2) != HAL_OK)
  {
    return -1;
  }
  
  return 0;
}