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STM32F429 Discovery - PWM input capture

Question asked by klemm.felix on May 26, 2016
Latest reply on May 27, 2016 by klemm.felix
Hey Guys,
I'm trying to deal with "PWM input capture" with TIM1.
Datasheet STM32F4
"17.3.7 PWM input mode"

If i know apply a constant PWM-signal at the E9 PIN my output at CCR1 and CCR2 aren't promising. 

My main routine looks like this:

main.c:

/**
 *
 * GPIO SPEED 2MHZ! VERY HIGH
 * /**
  ******************************************************************************
  * File Name          : main.c
  * Description        : Main program body
  ******************************************************************************
  *
  * COPYRIGHT(c) 2016 STMicroelectronics
  *
  * 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 "stm32f4xx_hal.h"
 
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
 
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim1;
TIM_HandleTypeDef htim3;
 
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
extern volatile int rx[7];
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM3_Init(void);
static void MX_TIM1_Init(void);
 
void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
 
 
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
 
/* USER CODE END PFP */
 
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
int main(void)
{
 
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration----------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_TIM3_Init();
  MX_TIM1_Init();
 
  /* USER CODE BEGIN 2 */
  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);
  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_2);
  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_3);
  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_4);
 
  TIM3->CCR1 = 2048;
  TIM3->CCR2 = 2048;
  TIM3->CCR3 = 2048;
  TIM3->CCR4 = 2048;
 
  TIM_CCxChannelCmd(TIM1, TIM_CHANNEL_1, TIM_CCx_ENABLE);
  TIM_CCxChannelCmd(TIM1, TIM_CHANNEL_2, TIM_CCx_ENABLE);
 
  __HAL_TIM_ENABLE_IT(&htim1, TIM_IT_CC1);
  __HAL_TIM_ENABLE(&htim1);
 
  while (1)
  {
     trace_printf("%x | %x | %x | %x | %d | %d\n", TIM1->SMCR, TIM1->CCER, TIM1->CCMR1, TIM1->DIER, rx[0], rx[1]);
     HAL_Delay(1000);
  }
}
 
/** System Clock Configuration
*/
void SystemClock_Config(void)
{
 
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
 
  __HAL_RCC_PWR_CLK_ENABLE();
 
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);
 
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV4;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
 
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
 
/* TIM1 init function */
void MX_TIM1_Init(void)
{
      TIM_SlaveConfigTypeDef sSlaveConfig;
      TIM_IC_InitTypeDef sConfigIC;
 
      htim1.Instance = TIM1;
      htim1.Init.Prescaler = 41;
      htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
      htim1.Init.Period = 65535;
      htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
      htim1.Init.RepetitionCounter = 0;
      HAL_TIM_Base_Init(&htim1);
 
      HAL_TIM_IC_Init(&htim1);
 
      sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;
      sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
      sSlaveConfig.TriggerPolarity = TIM_INPUTCHANNELPOLARITY_BOTHEDGE;
      sSlaveConfig.TriggerFilter = 0;
      HAL_TIM_SlaveConfigSynchronization(&htim1, &sSlaveConfig);
 
      // CC2NP & CC2P = 1
      sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
      sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
      sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
      HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_1);
 
      sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_BOTHEDGE;
      sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;
      sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
      HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_2);
}
 
/* TIM3 init function */
void MX_TIM3_Init(void)
{
 
  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;
 
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 41;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 4095;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  HAL_TIM_PWM_Init(&htim3);
 
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);
 
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
 
  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2);
 
  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3);
 
  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_4);
 
  HAL_TIM_MspPostInit(&htim3);
 
}
 
/** Configure pins as
        * Analog
        * Input
        * Output
        * EVENT_OUT
        * EXTI
*/
void MX_GPIO_Init(void)
{
 
  GPIO_InitTypeDef GPIO_InitStruct;
 
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOG, GPIO_PIN_13|GPIO_PIN_14, GPIO_PIN_RESET);
 
  /*Configure GPIO pins : PG13 PG14 */
  GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
 
/* USER CODE END 4 */
 
#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****/

stm32f4xx_it.c: 

01.void TIM1_CC_IRQHandler(void)
02.{
03.    if(__HAL_TIM_GET_FLAG(&htim1, TIM_FLAG_CC1) != RESET) {
04. 
05.        __HAL_TIM_CLEAR_IT(&htim1, TIM_IT_CC1);
06.            rx[0] = __HAL_TIM_GET_COMPARE(&htim1, TIM_CHANNEL_1);
07.            rx[1] = __HAL_TIM_GET_COMPARE(&htim1, TIM_CHANNEL_2);
08. 
09.    }
10.    HAL_TIM_IRQHandler(&htim1);
11.    /* USER CODE BEGIN TIM1_CC_IRQn 1 */
12.    /* USER CODE END TIM1_CC_IRQn 1 */
13. 
14. 
15.}

Well this will generate the following wrong output:

01.54 | b1 | 201 | 2 | 4095 | -->2047<--
02.54 | b1 | 201 | 2 | 4095 | -->4095<--
03.54 | b1 | 201 | 2 | 4095 | -->4095<--
04.54 | b1 | 201 | 2 | 4095 | -->2047<--
05.54 | b1 | 201 | 2 | 4095 | -->2047<--
06.54 | b1 | 201 | 2 | 4095 | -->4095<--
07.54 | b1 | 201 | 2 | 4095 | -->2047<--
08.54 | b1 | 201 | 2 | 4095 | -->2047<--
09.54 | b1 | 201 | 2 | 4095 | -->4095<--

rx[1] is toggling between the duty-cycle and the period value, but this should be the constant value of the duty-cycle. The values (count values) are correct.

Can someone help me with this problem?

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