How DO I switch from TIM4 CCP1 ISR to TIM4 CCP2 ISR

[bluewaters213]

Posted on May 25, 2013 at 17:31

Hello,

I have a program where by after executing TIM4 CCP1 interrupt routine for a specified number of times, I disable TIM4 CCP1 Interrupt and enable  TIM4 CCP2 interrupt in TIM1 CCP4 Routine .TIM1 CCP4 ISR check for flag and knows when to enable TIM4 CCP2 Interrupt. I notice that TIM4 CCP2 ISR get executed even though TIM4 CCP2 Interrupt is not enable yet. Do anybody have idea what could the problem. ============================== void TIM4_IRQHandler(void) {   if (TIM4->SR & TIM_SR_CC1IF)           {                                                 /*ALIGNEMENT TIME EXPIRE, PROCEED TO RAMPUP */                 TIM4->SR = ~TIM_SR_CC1IF;                       /*clear CC1IF flag */                                  TIM4->CCR1 = RAMP_TABLE[Ramp_Index];            /*TIM4 CCP1 Value Set to value in Ramp Table*/         TIM4->CNT = 0;                                  /*Clear TIM4 Counter*/         TIM4->EGR = TIM_EGR_UG;                             /*Reload prescaler and other registers*/                 Commutate();                                      /*Change commuation pattern on MOSFET*/                 TIM1->CCR1 = DutyCycle;                         /*Change CH1 PWM Duty Cycle by 6*/                 TIM1->CCR2 = DutyCycle;                         /*Change CH2 PWM Duty Cycle by 6*/                 TIM1->CCR3 = DutyCycle;                         /*Change CH3 PWM Duty Cycle by 6*/                                          if (Ramp_Index++ > RAMP_LENGTH)                 /*End of Motor Ramp*/                     {                                           /*TIM4 Counter use for ZC Timing*/                         Ramp_Index = 0;                             TIM4->DIER &= ~TIM_DIER_CC1IE;            /*Disable TIM4 CCP1 Interrupt*/                             TIM4->CNT = 0;                            /*Clear TIM4 Counter*/                             TIM2CCP1_Start();                         /*Start TIM2 CCP1 for ADC HOLDOFF of 10us*/     //                             GPIOB->BSRR = (1 << 9);                     }                 }   if (TIM4->SR & TIM_SR_CC2IF)        {            TIM4->SR = ~TIM_SR_CC2IF;              GPIOB->BSRR = (1 << 9);              Commutate();                                 /*Change commuation pattern on MOSFET*/              TIM4->CNT = 0;                            /*Clear TIM4 Counter*/              TIM4->DIER &= ~TIM_DIER_CC2IE;            /*Disable TIM4 CCP1 Interrupt*/              GPIOB->BRR = (1 << 9);        }         } =========================== this is how i enable TIM4 CCP2 interrupt in TIM4 CCP1 ISR                    TIM4->CCR1 =    FilteredCommutation_Time;                                            TIM4->CNT = 0;                    TIM4->EGR = TIM_EGR_UG;                           /*Reload Prescaler and Other Registers*/                    TIM4->DIER = TIM_DIER_CC2IE;                 /*Enable TIM2 CCP2 Interrupt*/ #stm32f103rb-tim4-ccp1-isr