tim2 interrupt

[novotny]

Posted on June 02, 2011 at 12:23

Hello,

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

[Tesla DeLorean]

Posted on June 02, 2011 at 19:01

Do you see any mistake? or do you have some example, to study how to set timer and interrupt?

Several obvious flaws, and yes several examples have been posted on the forum.     if(TIM2->SR&&TIM_SR_CC1IF){STM32vldiscovery_LEDOn(LED4);}     else{STM32vldiscovery_LEDOn(LED4);} One too many ampersands there to do what you want.   RCC->APB1RSTR=RCC_APB1RSTR_TIM2RST;    //peripheral reset Holding TIM2 in reset, I think. Suggest you use the library, unless you enjoy debugging register minutia. If you want to use register directly, don't write in absolute values, mask in the bits you want to change.

[novotny]

Posted on June 04, 2011 at 11:03

so, you were right, ''RCC->APB1RSTR=RCC_APB1RSTR_TIM2RST;'' holded device in reset. Now it's working:

  RCC->APB1RSTR|=RCC_APB1RSTR_TIM2RST;    //peripheral reset   RCC->APB1RSTR&=~RCC_APB1RSTR_TIM2RST;    //peripheral reset off thanks