Bajrangi Bhaijaan

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5 years ago.

Unable to get timer interrupt Nucleo F103RB

Hi , I have used the following code for f103rb but I don't seem to be getting an interrupt. My counter is working fine as verified using the st link utility.

My code is 


#include "stm32f10x.h"
#include "system_stm32f10x.h"
#include "core_cm3.h"


void TIM3_IRQHandler();


int main(void) {
 
  SystemInit();
    RCC->APB1ENR |=0x2; // Timer 3 clk enable
    RCC->APB2ENR |= 0x804; // __PortA_CLK_Enable()
    GPIOA->CRL = (0x00003333); // Port A bits 0 to 3 are in output mode , max speed 50 Mhz
   
    
    TIM3->PSC = 65535;
    TIM3->ARR = 0xFF;
    TIM3->CR1 = TIM_CR1_URS; 
    
    TIM3->DIER = TIM_DIER_UIE ; // enable update interrupts only
    TIM3->EGR = TIM_EGR_UG;     // enable update generation
    TIM3->CR1 |= TIM_CR1_CEN; // enable counter

    NVIC_EnableIRQ(TIM3_IRQn);  
    NVIC_SetVector(TIM3_IRQn, (uint32_t)&TIM3_IRQHandler);
    while (1) ;
}
 
void TIM3_IRQHandler() // interrupt routine
{
    GPIOA->ODR^= 0x0001;
    TIM3->SR &= ~TIM_SR_UIF; // clear UIF flag
}
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