STM32 HAL timer interrupt isn't triggered
I'm trying to periodically send and Serial string from my STM32F746ZG device, using an interrupt. Most of the code is auto generated by stm32cubemx. I have hardware breakpoints (jlink) set at each interrupt but I only enter the period elapse function once, at initialization. When I randomly pause the debugger I see the counter values between 0 and 1000 as expected. So I know the counter resets every second. The internal clock runs at 16MHz.
My experience with embedded devices is limited to BBB, Raspberry and Arduino's. I tried different examples and tutorials, but at the moment I just don't know anymore. Any help or suggestions is much appreciated.
my main function:
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_RTC_Init();
MX_TIM1_Init();
if (HAL_TIM_Base_Start(&htim1) != HAL_OK) {
Error_Handler();
}
if (HAL_TIM_Base_Start_IT(&htim1) != HAL_OK) {
Error_Handler();
}
while (1) {
cnt = __HAL_TIM_GetCounter(&htim1);
}
}
TIM1 init:
static void MX_TIM1_Init(void) {
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
htim1.Instance = TIM1;
htim1.Init.Prescaler = 16000;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 1000;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0x0;
if (HAL_TIM_Base_Init(&htim1) != HAL_OK) {
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK) {
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig)
!= HAL_OK) {
Error_Handler();
}
}
My Base_MspInit function:
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(htim_base->Instance==TIM1)
{
/* Peripheral clock enable */
__HAL_RCC_TIM1_CLK_ENABLE();
/* Peripheral interrupt init */
HAL_NVIC_SetPriority(TIM1_BRK_TIM9_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_BRK_TIM9_IRQn);
HAL_NVIC_SetPriority(TIM1_UP_TIM10_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);
HAL_NVIC_SetPriority(TIM1_TRG_COM_TIM11_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_TRG_COM_TIM11_IRQn);
HAL_NVIC_SetPriority(TIM1_CC_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_CC_IRQn);
}
}
My TIM IRQ handler function:
void TIM1_UP_TIM10_IRQHandler(void)
{
HAL_TIM_IRQHandler(&htim1);
}
HAL IRQ Handler which calls the HAL_TIM_PeriodElapsedCallback:
void HAL_TIM_IRQHandler(TIM_HandleTypeDef *htim)
{
/* Capture compare 1 event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC1) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC1) !=RESET)
{
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_CC1);
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_1;
/* Input capture event */
if((htim->Instance->CCMR1 & TIM_CCMR1_CC1S) != 0x00)
{
HAL_TIM_IC_CaptureCallback(htim);
}
/* Output compare event */
else
{
HAL_TIM_OC_DelayElapsedCallback(htim);
HAL_TIM_PWM_PulseFinishedCallback(htim);
}
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
}
}
}
/* Capture compare 2 event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC2) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC2) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_CC2);
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_2;
/* Input capture event */
if((htim->Instance->CCMR1 & TIM_CCMR1_CC2S) != 0x00)
{
HAL_TIM_IC_CaptureCallback(htim);
}
/* Output compare event */
else
{
HAL_TIM_OC_DelayElapsedCallback(htim);
HAL_TIM_PWM_PulseFinishedCallback(htim);
}
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
}
}
/* Capture compare 3 event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC3) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC3) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_CC3);
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_3;
/* Input capture event */
if((htim->Instance->CCMR2 & TIM_CCMR2_CC3S) != 0x00)
{
HAL_TIM_IC_CaptureCallback(htim);
}
/* Output compare event */
else
{
HAL_TIM_OC_DelayElapsedCallback(htim);
HAL_TIM_PWM_PulseFinishedCallback(htim);
}
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
}
}
/* Capture compare 4 event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC4) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC4) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_CC4);
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_4;
/* Input capture event */
if((htim->Instance->CCMR2 & TIM_CCMR2_CC4S) != 0x00)
{
HAL_TIM_IC_CaptureCallback(htim);
}
/* Output compare event */
else
{
HAL_TIM_OC_DelayElapsedCallback(htim);
HAL_TIM_PWM_PulseFinishedCallback(htim);
}
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
}
}
/* TIM Update event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_UPDATE) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_UPDATE) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_UPDATE);
HAL_TIM_PeriodElapsedCallback(htim);
}
}
/* TIM Break input event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_BREAK) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_BREAK) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_BREAK);
HAL_TIMEx_BreakCallback(htim);
}
}
/* TIM Break input event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_BREAK2) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_BREAK) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_BREAK);
HAL_TIMEx_BreakCallback(htim);
}
}
/* TIM Trigger detection event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_TRIGGER) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_TRIGGER) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_TRIGGER);
HAL_TIM_TriggerCallback(htim);
}
}
/* TIM commutation event */
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_COM) != RESET)
{
if(__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_COM) !=RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_FLAG_COM);
HAL_TIMEx_CommutationCallback(htim);
}
}
}
My callback function:
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (htim->Instance == TIM1) {
char frame[20] = "123456789012345678\r\n";
HAL_UART_Transmit(&huart1, frame, 20, 10);
}
}
Answer
The code above was correct. The break points were "temporary hardware" breakpoints, when I changed them to "hardware" breakpoints they where hit when there was a counter overflow indicating that the period was reached.
Typical case of staring at the same code for far too long ;-)