Question
can't use TIM21 as pulse counter STM32L051
I try to count pulses from PA1 as TIM21_ETR, seems like all setting is OK, but no counting what soever. What am I missing?
Thanks
/* TIM21 init function */
void MX_TIM21_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
htim21.Instance = TIM21;
htim21.Init.Prescaler = 0;
htim21.Init.CounterMode = TIM_COUNTERMODE_UP;
htim21.Init.Period = 0;
htim21.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim21) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_ETRMODE2;
sClockSourceConfig.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED;
sClockSourceConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1;
sClockSourceConfig.ClockFilter = 0;
if (HAL_TIM_ConfigClockSource(&htim21, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim21, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
HAL_TIM_Base_MspInit(&htim21);
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(tim_baseHandle->Instance==TIM21)
{
/* USER CODE BEGIN TIM21_MspInit 0 */
/* USER CODE END TIM21_MspInit 0 */
/* TIM21 clock enable */
__HAL_RCC_TIM21_CLK_ENABLE();
/**TIM21 GPIO Configuration
PA1 ------> TIM21_ETR
*/
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_TIM21;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USER CODE BEGIN TIM21_MspInit 1 */
/* USER CODE END TIM21_MspInit 1 */
}
}