Timer Interrupt STM32F4

Posted on June 13, 2013 at 05:44

I'm having difficulty getting a simple timer reload interupt system to work.

Once the initTimer() method is called the MCU appears to stop.  Even when I comment out ''

soloInd->flash();

''

Any help at all would be much appreciated.

#include ''stm32f4xx_tim.h''

Indicators *soloInd;

void Indicators::initTimer()

{

    // Use Timer 5

    TIMx = TIM5;

    NVIC_InitTypeDef NVIC_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);

    // Initialise TimeBaseStructure with default values.

    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

    TIM_TimeBaseInit(TIMx, &TIM_TimeBaseStructure);

    /* Enable timer 5 capture compare Interrupt */

    register_interrupt(TIM5_IRQn, Indicators::IND_IRQ_Handler);

    NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    TIM_ITConfig(TIMx, TIM_IT_Update, ENABLE);

}

void Indicators::IND_IRQ_Handler()

{

    TIM5->SR &= ~TIM_SR_UIF;

    soloInd->flash();

}

// Not sure how this method works, was already written.

inline void register_interrupt(uint8_t vector_offset,  void (*function)())

{

    ((uint32_t*)SCB->VTOR)[(uint16_t)vector_offset + 16] = (uint32_t)function;

}