/nucleo-l476RG/src/ch11/main-ex9.c

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

#include "stm32l4xx_hal.h"

#include <nucleo_hal_bsp.h>

#include <string.h>

#include <math.h>



/* Private variables ---------------------------------------------------------*/

TIM_HandleTypeDef htim2;



void MX_TIM2_Init(void);



DMA_HandleTypeDef hdma_tim2_ch1;



#define PI    3.14159

#define ASR   1.8 //360 / 200 = 1.8



int main(void) {

  uint32_t IV[200];

  float angle;



  HAL_Init();



  Nucleo_BSP_Init();

  MX_TIM2_Init();



  for (uint8_t i = 0; i < 200; i++) {

    angle = ASR*(float)i;

    IV[i] = (uint16_t) rint(100 + 99*sinf(angle*(PI/180)));

  }



  HAL_TIM_PWM_Start_DMA(&htim2, TIM_CHANNEL_1, (uint32_t *)IV, 200);



  while (1);

}



/* TIM2 init function */

void MX_TIM2_Init(void) {

  TIM_OC_InitTypeDef sConfigOC;

  TIM_ClockConfigTypeDef sClockSourceConfig;



  htim2.Instance = TIM2;

  htim2.Init.Prescaler = 39;

  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim2.Init.Period = 199;

  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  HAL_TIM_PWM_Init(&htim2);



  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

  HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig);



  sConfigOC.OCMode = TIM_OCMODE_PWM1;

  sConfigOC.Pulse = 0;

  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

  HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1);



  hdma_tim2_ch1.Instance = DMA1_Channel5;

  hdma_tim2_ch1.Init.Request = DMA_REQUEST_4;

  hdma_tim2_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;

  hdma_tim2_ch1.Init.PeriphInc = DMA_PINC_DISABLE;

  hdma_tim2_ch1.Init.MemInc = DMA_MINC_ENABLE;

  hdma_tim2_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

  hdma_tim2_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

  hdma_tim2_ch1.Init.Mode = DMA_CIRCULAR;

  hdma_tim2_ch1.Init.Priority = DMA_PRIORITY_LOW;

  HAL_DMA_Init(&hdma_tim2_ch1);



  /* Several peripheral DMA handle pointers point to the same DMA handle.

   Be aware that there is only one channel to perform all the requested DMAs. */

  __HAL_LINKDMA(&htim2, hdma[TIM_DMA_ID_CC1],hdma_tim2_ch1);

}



void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* htim_base) {

  GPIO_InitTypeDef GPIO_InitStruct;

  if (htim_base->Instance == TIM2) {

    __TIM2_CLK_ENABLE();



    /**TIM2 GPIO Configuration

     PA6     ------> TIM3_CH1

     */

    GPIO_InitStruct.Pin = GPIO_PIN_5;

    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;

    GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  }

}



#ifdef USE_FULL_ASSERT



/**

 * @brief Reports the name of the source file and the source line number

 * where the assert_param error has occurred.

 * @param file: pointer to the source file name

 * @param line: assert_param error line source number

 * @retval None

 */

void assert_failed(uint8_t* file, uint32_t line)

{

  /* USER CODE BEGIN 6 */

  /* User can add his own implementation to report the file name and line number,

   ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* USER CODE END 6 */



}



#endif



/**

 * @}

 */



/**

 * @}

 */



/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/