Timer Encoder Interface

Posted on December 13, 2014 at 13:01

Thank you Clive but sadly I couldn't get a solution out of that. It looks like the parameters are set correctly in my code (except for a different mapping of the pins made automatically by STCubeMX) but nevertheless it doesn't count.

I'll make some other tests and see if I can figure out the problem; in the meanwhile, I'll paste here the init code:

 void MX_TIM2_Init(void)

{

  TIM_Encoder_InitTypeDef sConfig;

  TIM_MasterConfigTypeDef sMasterConfig;

  htim2.Instance = TIM2;

  htim2.Init.Prescaler = 0;

  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim2.Init.Period = 0;

  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  sConfig.EncoderMode = TIM_ENCODERMODE_TI12;

  sConfig.IC1Polarity = TIM_ICPOLARITY_RISING;

  sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;

  sConfig.IC1Prescaler = TIM_ICPSC_DIV1;

  sConfig.IC1Filter = 0;

  sConfig.IC2Polarity = TIM_ICPOLARITY_RISING;

  sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;

  sConfig.IC2Prescaler = TIM_ICPSC_DIV1;

  sConfig.IC2Filter = 0;

  HAL_TIM_Encoder_Init(&htim2, &sConfig);

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);

}

void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef* htim_encoder)

{

  GPIO_InitTypeDef GPIO_InitStruct;

  if(htim_encoder->Instance==TIM1)

  {

  [...]

  }

  else if(htim_encoder->Instance==TIM2)

  {

  /* USER CODE BEGIN TIM2_MspInit 0 */

  /* USER CODE END TIM2_MspInit 0 */

    /* Peripheral clock enable */

    __TIM2_CLK_ENABLE();

  

    /**TIM2 GPIO Configuration    

    PA1     ------> TIM2_CH2

    PA5     ------> TIM2_CH1 

    */

    GPIO_InitStruct.Pin = GPIO_PIN_1|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);

[...]

}

And in main function:

 int main(void)

{

  /* USER CODE BEGIN 1 */

extern USBD_HandleTypeDef hUsbDeviceFS;

  /* 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_TIM2_Init();

  USB_reset();

  MX_USB_DEVICE_Init();

  /* USER CODE BEGIN 2 */

char outbuf[40]; //buffer for output communication

int count2 = 0;

  /* USER CODE END 2 */

  /* USER CODE BEGIN 3 */

while(UserButton_GetState() != 1); //wait until the button is pressed

sprintf(outbuf, ''test message\n'');

VCP_PutStr(outbuf);

  /* Infinite loop */

  while (1)

  {

count2 = COUNT2;  //COUNT 2 has been defined as TIM2->CNT

sprintf(outbuf, ''\nEncoder 2: %d'', count2);

VCP_PutStr(outbuf);

HAL_GPIO_TogglePin (GPIOE, GPIO_PIN_9); 

HAL_Delay(250);

}

  /* USER CODE END 3 */

}