How to count until a number with timer peripheral

Question

I'm trying to use the TIM peripheral to count external pulses until a number and throw a interruption. I'm using STM32F429 and HAL library. I am initializing the TIM2 with this code:

void InitializeTimer2()
{
 TIM_SlaveConfigTypeDef sSlaveConfig;
 TIM_MasterConfigTypeDef sMasterConfig;
 htim2.Instance = TIM2;
 htim2.Init.Prescaler = 0;
 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim2.Init.Period = 5;
 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 if(HAL_TIM_Base_Init(&htim2) != HAL_OK)
 {
 /* Initialization Error */
 Error_Mensage("TIM2");
 }
 sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
 sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
 sSlaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_RISING;
 sSlaveConfig.TriggerFilter = 15;
 HAL_TIM_SlaveConfigSynchronization(&htim2, &sSlaveConfig);
 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);
 HAL_TIM_Base_Start_IT(&htim2);
}

But I tried many HAL_TIM functions to get the interruption but with no success.

It will be a pleasure to provide any other helpful code...

• Ignacio Vazquez-Abrams: Have you tried setting an Output Compare register to the desired count?
• Leandro Lima: No, I thought that it would be possible to get something like a interruption informing an overflow.
• Tom Carpenter: Count down from your required value until the counter overflows?
• Leandro Lima: Yeah I tried it before...do you know if is there this kind of thing?

Answer 1

the answer is to use the function HAL_TIM_PeriodElapsedCallback:

/* TIM5 init function */
void MX_TIM5_Init(void)
{
 TIM_SlaveConfigTypeDef sSlaveConfig;
 TIM_MasterConfigTypeDef sMasterConfig;
 htim5.Instance = TIM5;
 htim5.Init.Prescaler = 0;
 htim5.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim5.Init.Period = 10;
 htim5.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 HAL_TIM_Base_Init(&htim5);
 sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
 sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
 sSlaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_RISING;
 sSlaveConfig.TriggerFilter = 15;
 HAL_TIM_SlaveConfigSynchronization(&htim5, &sSlaveConfig);
 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 HAL_TIMEx_MasterConfigSynchronization(&htim5, &sMasterConfig);
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
 if (htim->Instance == TIM5)
 {
 count2++;
 }
}

I initialized the timer with this: HAL_TIM_Base_Start_IT(&htim5).

This code permits to count external pulses and throw an interruption every 10 pulses.

Reggards!!