Posted on October 28, 2014 at 06:58Hello,
I have some problems to initialise the Low power timer correctly. I'm using the STM32Cube firmware and a STM32L053R8 chip. To start with the LPTIM, I will only toggle a GPIO but I'll never enter the interrupt handler of the LPTIM.
Probably someone has any ideas what's wrong with my code...
int main()
{
HAL_Init();
__GPIOA_CLK_ENABLE();
GPIO_InitTypeDef gpioOutputStructure1;
gpioOutputStructure1.Pin = GPIO_PIN_8;
gpioOutputStructure1.Mode = GPIO_MODE_OUTPUT_PP;
gpioOutputStructure1.Pull = GPIO_PULLDOWN;
gpioOutputStructure1.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init( GPIOA, &gpioOutputStructure1 );
HAL_GPIO_WritePin( GPIOA, GPIO_PIN_8, GPIO_PIN_SET );
initLPTIM();
while( 1 );
}
void initLPTIM( void )
{
uint32_t lptimTicks = 327;
/* Enable External Low Speed Clock (LSE) */
RCC_OscInitTypeDef RCC_OscInitStructure;
RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStructure.LSEState = RCC_LSE_ON;
HAL_RCC_OscConfig( &RCC_OscInitStructure );
/* Select the LSE clock as LPTIM peripheral clock */
RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStructure;
RCC_PeriphCLKInitStructure.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
RCC_PeriphCLKInitStructure.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig( &RCC_PeriphCLKInitStructure );
/* Initialise LPTIM peripheral */
LPTIM_InitStructure.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
LPTIM_InitStructure.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
LPTIM_InitStructure.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
LPTIM_InitStructure.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
LPTIM_InitStructure.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
LPTIM_InitStructure.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
/* Initialise LPTIM peripheral according to the passed paramters */
if( HAL_LPTIM_Init( &LPTIM_InitStructure ) != HAL_OK )
{
while( 1 );
}
/* Start the Timeout function in interrupt mode */
if( HAL_LPTIM_COUNTER_Start_IT( &LPTIM_InitStructure, 99, 49 ) != HAL_OK )
{
while( 1 );
}
}
void LPTIM1_IRQHandler(void)
{
/* Autoreload match interrupt */
if( __HAL_LPTIM_GET_FLAG( &LPTIM_InitStructure, LPTIM_FLAG_ARRM ) != RESET )
{
if( __HAL_LPTIM_GET_ITSTATUS( &LPTIM_InitStructure, LPTIM_IT_ARRM ) != RESET )
{
/* Clear Autoreload match flag */
__HAL_LPTIM_CLEAR_FLAG( &LPTIM_InitStructure, LPTIM_FLAG_ARRM );
HAL_GPIO_TogglePin( GPIOA, GPIO_PIN_8 );
//timer.interruptServiceMethod();
}
}
}
#lptim #stm32cube-stm32l0xx
