Posted on June 02, 2011 at 12:23Hello,
i try get interrupt from timer 2 in compare mode. I want up count mode and generate interrupt in case match compare_register and counter and in case overflow counter. I'm using TrueStudio.
Here is my code:
void EXTI0_IRQHandler(void)
{
/*-----LOCAL-VARIABLES-----------------*/
int i=100000;
if(EXTI_GetITStatus(USER_BUTTON_EXTI_LINE) != RESET)
{
if(k){SetFreqViaHSI(24);k=0;}
else{SetFreqViaHSI(2);k=1;}
while(i){i--;}
/* Clear the User Button EXTI line pending bit */
EXTI_ClearITPendingBit(USER_BUTTON_EXTI_LINE);
}
}
void TIM2_IRQHandler(void)
{
if(TIM2->SR&&TIM_SR_CC1IF){STM32vldiscovery_LEDOn(LED4);}
else{STM32vldiscovery_LEDOn(LED4);}
TIM2->SR=0x0000;
TIM2->CR1|=0X0001;
}
/*-----MAIN-FUNCTION-------------------*/
int main(void)
{
/*-----LOCAL-VARIABLES-----------------*/
unsigned long int i=0;
/*-----CONFIGURACE---------------------*/
SetFreqViaHSI(24); //set HSI and PLL to 24MHz
STM32vldiscovery_LEDInit(LED3); //init LED3 (0)
STM32vldiscovery_LEDInit(LED4); //init LED4 (1)
STM32vldiscovery_LEDOn(LED3);
STM32vldiscovery_LEDOff(LED4);
RCC->APB1RSTR=RCC_APB1RSTR_TIM2RST; //peripheral reset
RCC->APB2ENR=RCC_APB2ENR_IOPCEN; //portc Clock enable
RCC->APB1ENR=RCC_APB1ENR_TIM2EN; //peripheral enable
NVIC_EnableIRQ(TIM2_IRQn); //nvic configure
TIM2->DIER=TIM_DIER_CC1IE|TIM_DIER_UIE; //enable interrupt
TIM2->CCMR1=TIM_CCMR1_OC1M_0;
TIM2->EGR=TIM_EGR_UG; //Update Generation
TIM2->CCR1=0xBF;
TIM2->CCER=TIM_CCER_CC1E; //Capture/Compare 1 output enable
TIM2->CR1=TIM_CR1_CEN; //enable counter
STM32vldiscovery_PBInit(BUTTON_USER, BUTTON_MODE_EXTI); // init button - interrupt
/*-----MAIN-LOOP-----------------------*/
while (1)
{
}
}
void SetFreqViaHSI(int freq)
{
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
int i=400;
RCC_DeInit(); //default settings
RCC_HSICmd(ENABLE); //enable HSI
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI); //HSI - clock source
while (RCC_GetSYSCLKSource() != 0x00) //check HSI is clock source
{
}
while(i){i--;} //delay
FLASH_SetLatency(FLASH_Latency_0); //flash 0 wait state
RCC_HCLKConfig(RCC_SYSCLK_Div1); //HCLK = SYSCLK
RCC_PCLK2Config(RCC_HCLK_Div1); //PCLK2 = HCLK
RCC_PCLK1Config(RCC_HCLK_Div1); //PCLK1 = HCLK
RCC_PLLConfig(RCC_PLLSource_HSI_Div2, RCC_PLLMul_6);
RCC->CFGR&=0xFFFFFF0F;
RCC->CFGR|=RCC_SYSCLK_Div1;
RCC_PLLCmd(ENABLE); //Enable PLL
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) //Wait till PLL is ready
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Select PLL as system clock source
while (RCC_GetSYSCLKSource() != 0x08) //Wait till PLL is used as system clock source
{
}
}
so that is it. I have breakpoint on ''void TIM2_IRQHandler(void)'' but it newer fall in tim2 interrupt. Do you see any mistake? or do you have some example, to study how to set timer and interrupt?
thanks
