A CCR3 issue on all timers

[kTC30]

Hello everyone,

I am starting to program with a stm32f103c8 and I have a problem when I want to update the compare output on channel 3. The output is either 0V or 3.3V depending on the polarity.

The rest of the outputs work correctly.

Here I leave the interrupt where I update the value of the register:

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim)
{
 
	if (htim == &htim2)
 
	{
 
		R=2000*factor*sin(i*paso)+2000;
 
		i++;
 
		if(i>n){
 
		i=0;
 
		}
 
		TIM2->CCR1=R;
 
		TIM2->CCR2=(4000-R);
 
		TIM2->CCR3=R;
 
		TIM2->CCR4=(4000-R);
 
	}
}

[KnarfB]

How are the channels configured? Check the register bits.

hth

KnarfB

[kTC30]

Hello, thanks for answering, I leave here all the timer settings:

HAL_TIM_Base_Start_IT(&htim2);
  HAL_TIM_OC_Start(&htim2, TIM_CHANNEL_1);
  HAL_TIM_OC_Start(&htim2, TIM_CHANNEL_2);
  HAL_TIM_OC_Start(&htim2, TIM_CHANNEL_3);
  HAL_TIM_OC_Start(&htim2, TIM_CHANNEL_4);
 
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
 
  /** Initializes the CPU, AHB and APB buses clocks
  */
  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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
  PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}
 
 
static void MX_TIM2_Init(void)
{
 
  /* USER CODE BEGIN TIM2_Init 0 */
 
  /* USER CODE END TIM2_Init 0 */
 
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};
 
  /* USER CODE BEGIN TIM2_Init 1 */
 
  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 4000;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_OC_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */
 
  /* USER CODE END TIM2_Init 2 */
  HAL_TIM_MspPostInit(&htim2);
 
}
 
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim)
{
	if (htim == &htim2)
	{
		R=2000*factor*sin(i*paso)+2000;
		i++;
		if(i>n){
		i=0;
		}
		TIM2->CCR1=R;
		TIM2->CCR2=(4000-R);
		TIM2->CCR3=R;
		TIM2->CCR4=(4000-R);
	}
 
}

[gbm]

Are you sure it's real ST? AFAIK, one of Chinese F103 clones has a problem with one of timer channels.

[Tesla DeLorean]

Hard to replicate with missing code, and no break-down of the pin usage.

Show image of board/chip.

Show signals from pins on scope.

[kTC30]

Yes, unfortunately it is a clone due to my lack of knowledge in the purchase. If what you tell me is true, I can only buy an original plate... thanks for your answer

I can't send all the code for you to replicate because it's "too long" and the web doesn't allow it, sorry