Interrupt help anyone?...[stm32]

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Kam Bansal

• March 24, 2010 01:37

Hi all,

 

I'm just trying to get TIM3 to call my IRQ handler every one second...Was wondering if anyone could point out the issues etc...

I know I need to adjust my PSC and ARR values...

Thoughts? Pointers?

Thanks in advance!

 

~Kam (^8*

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#include "stdint.h"
#include "targets/STM32F10x.h"

// LED1 is on PC12
// The button is on PA0

#define SET_BIT(REG, BIT)     ((REG) |= (BIT))
#define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
#define READ_BIT(REG, BIT)    ((REG) & (BIT))
#define CLEAR_REG(REG)        ((REG) = (0x0))
#define WRITE_REG(REG, VAL)   ((REG) = (VAL))
#define READ_REG(REG)         ((REG))
#define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))

volatile uint32_t flag=1;

// init's the LED on RA12
void initLED(void)
{
    // configure LED ports
    RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
    uint32_t pin = 4;
    uint32_t mode = (uint32_t)0x05 << (pin * 4);
    uint32_t mask = (uint32_t)0x0f << (pin * 4);
    uint32_t temp = GPIOC_CRH & ~mask;
    GPIOC_CRH = temp | mode;
}

// crossworks handler name
void TIM3_IRQHandler(void)
{
    if(flag==1)
    {
        GPIOC_BSRR  = (1<<12);   // turn on LED
        flag=0;
    }
    else
    {
        GPIOC_BRR = (1<<12);    // turn off LED
        flag=1;
    }

    CLEAR_BIT(TIM3_SR, TIM3_SR_UIF_MASK);
    SET_BIT(Irq_0_to_31_Clear_Pending, 1 << 29);
}

// I'm running at 72MHz
// I want a one second "beat"
void initTim3()
{
    SET_BIT(RCC_APB1ENR, RCC_APB1ENR_TIM3EN);
    CLEAR_BIT(TIM3_CR1, TIM3_CR1_CEN_MASK);
    SET_BIT(TIM3_CR1, TIM3_CR1_ARPE);
    WRITE_REG(TIM3_PSC, 1000);
    WRITE_REG(TIM3_ARR, 70);
    WRITE_REG(TIM3_CNT, 0);
    SET_BIT(TIM3_DIER, TIM3_DIER_UIE);
    SET_BIT(Irq_0_to_31_Clear_Pending, 1 << 29);
    SET_BIT(Irq_0_to_31_Set_Enable, 1 << 29);
}

void main(void)
{
    initLED();
    initTim3();

    while(1)
    {
    }
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

0

• 

  Kam Bansal

  • March 24, 2010 01:43

  ooops, forgot to enable timer! Still does not work...boooo...

   

  #include "stdint.h"
  #include "targets/STM32F10x.h"
  
  // LED1 is on PC12
  // The button is on PA0
  
  #define SET_BIT(REG, BIT)     ((REG) |= (BIT))
  #define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
  #define READ_BIT(REG, BIT)    ((REG) & (BIT))
  #define CLEAR_REG(REG)        ((REG) = (0x0))
  #define WRITE_REG(REG, VAL)   ((REG) = (VAL))
  #define READ_REG(REG)         ((REG))
  #define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))
  
  volatile uint32_t flag=1;
  
  // init's the LED on RA12
  void initLED(void)
  {
      // configure LED ports
      RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
      uint32_t pin = 4;
      uint32_t mode = (uint32_t)0x05 << (pin * 4);
      uint32_t mask = (uint32_t)0x0f << (pin * 4);
      uint32_t temp = GPIOC_CRH & ~mask;
      GPIOC_CRH = temp | mode;
  }
  
  // crossworks handler name
  void TIM3_IRQHandler(void)
  {
      if(flag==1)
      {
          GPIOC_BSRR  = (1<<12);   // turn on LED
          flag=0;
      }
      else
      {
          GPIOC_BRR = (1<<12);    // turn off LED
          flag=1;
      }
  
      CLEAR_BIT(TIM3_SR, TIM3_SR_UIF_MASK);
      SET_BIT(Irq_0_to_31_Clear_Pending, 1 << 29);
  }
  
  // I'm running at 72MHz
  // I want a one second "beat"
  void initTim3()
  {
      SET_BIT(RCC_APB1ENR, RCC_APB1ENR_TIM3EN);       // enable clock to timer
      CLEAR_BIT(TIM3_CR1, TIM3_CR1_CEN_MASK);         // disable tim3
      SET_BIT(TIM3_CR1, TIM3_CR1_ARPE);               // auto reload counter value
      WRITE_REG(TIM3_PSC, 1000);                      // set PSC
      WRITE_REG(TIM3_ARR, 70);                        // set ARR
      WRITE_REG(TIM3_CNT, 0);                         // clear counter value
      SET_BIT(TIM3_DIER, TIM3_DIER_UIE);              // enable int on overflow
      SET_BIT(Irq_0_to_31_Clear_Pending, 1 << 29);    // clear pending int
      SET_BIT(Irq_0_to_31_Set_Enable, 1 << 29);       // enable int
      SET_BIT(TIM3_CR1, TIM3_CR1_CEN);                // enable tim3
  }
  
  void main(void)
  {
      initLED();
      initTim3();
  
      while(1)
      {
      }
  }
  
  

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