ADC preventing SysTick timer Interrupt (Why?)

[bluewaters213]

Posted on March 10, 2013 at 17:56

Hello,

Once I initailize ADC in my program, it stop the SysTick timer Interrupt from working while ADC work correctly.I want ADC Interrutp to have higher priority than SysTick timer Interrupt.How do I set the priority Level correctly so that the SysTick timer & AD will work correctly?. ======SYSTEM TICK DOES NOT WORK WHILE ADC IS ENABLE================= int main(void) {               Init_SysClock();              /*Initialize GPIO & Peripherals Clocks*/   Init_RCC();                   /*Initialize GPIO*/   Init_ADC();                   /*Initialized ADC in dual Mode*/   Init_PWM();                   /*Initialize 17.5KHz PWM on CH 1-3*/   StartUp();                    /*Align & RampUP BLDC Motor*/         if (SysTick_Config(SystemCoreClock / 1000))         {          while(1);/* Capture error */         }         NVIC_SetPriority(SysTick_IRQn,35);    //Assign SysTick_IRQn = 30 | ADC interrupt Priority = 25(default)              while(1)     {     } } ======SYSTEM TICK DOES WORK WHILE ADC IS DISABLE================= int main(void) {               Init_SysClock();              /*Initialize GPIO & Peripherals Clocks*/   Init_RCC();                   /*Initialize GPIO*/   //Init_ADC();                   /*Initialized ADC in dual Mode*/   Init_PWM();                   /*Initialize 17.5KHz PWM on CH 1-3*/   StartUp();                    /*Align & RampUP BLDC Motor*/         if (SysTick_Config(SystemCoreClock / 1000))         {          while(1);/* Capture error */         }           NVIC_SetPriority(SysTick_IRQn,35);    //Assign SysTick_IRQn = 30 | ADC interrupt Priority = 25(default)                   while(1)     {     } } =============================================================== //======================================================================== // ADC Configuration for CH10(PC0) - CH13(PC3) in Dual Simultaneous Injected Mode //======================================================================== void Init_ADC(void) {   RCC-> CFGR |= RCC_CFGR_ADCPRE_DIV6;   //ADC divided by 4 (12MHz) //Scan Enable| Injected Simultaneous Dual Mode Only |Discontinuous mode on injected channels Enable //Injected Interrupt Enable     ADC1->CR1 = ADC_CR1_SCAN | INJECTED_DUAL_MODE_ONLY |ADC_CR1_JEOCIE;      //ADC2 Config=>Interrupt enable for injected channels | Scan Mode*/   ADC2->CR1 = ADC_CR1_SCAN | ADC_CR1_JEOCIE;      //Power Up ADC1 |Conversion on External Event Enabled | Enable TIM1 CC4 Trigger   ADC1->CR2 = ADC_CR2_ADON | ADC_CR2_JEXTTRIG | TIM1_CC4_TRIG; //Power Up ADC2 |Conversion on External Event Enabled | Enable Software Trigger   ADC2->CR2 = ADC_CR2_ADON | ADC_CR2_JEXTTRIG | SOFTWARE_TRIG;   ADC1->SMPR1 = ((uint32_t)0x00000000); //CH10 - CH11 Sample Time = 239.5 cycles   ADC2->SMPR1 = ((uint32_t)0x00000000); //CH12 - CH13 Sample Time = 239.5 cycles   ADC1->JSQR = ADC_JSQR_JL_0 | Inject_CH10_CH11;  //2 Injected conversions (CH10 & CH11)   ADC2->JSQR = ADC_JSQR_JL_0 | Inject_CH12_CH13;  //2 Injected conversions (CH12 & CH13)   ADC1->CR2 |= ADC_CR2_RSTCAL;   //Initialize ADC1 calibration register   while ( ADC1->CR2 & ADC_CR2_RSTCAL );   ADC2->CR2 |= ADC_CR2_RSTCAL;   //Initialize ADC2 calibration register   while( ADC2->CR2 & ADC_CR2_RSTCAL );   ADC1->CR2 |= ADC_CR2_CAL;   //Start ADC2 calibration   while ( ADC1->CR2 & ADC_CR2_CAL );//Calibration Completed   ADC2->CR2 |= ADC_CR2_CAL;   //Start ADC2 calibration   while( ADC2->CR2 & ADC_CR2_CAL );//Calibration Completed        NVIC_EnableIRQ(ADC1_2_IRQn);//Enable ADC1_2 Interrupt in NVIC } void SysTick_Handler(void)  {        GPIOB->ODR ^= (1 << 8);   } Regards

[Tesla DeLorean]

Posted on March 10, 2013 at 18:59

On might hazard that there is a problem with your ADC interrupt handler, not shown, or the rate at which it is called. If you saturate the processor it will stay in the handler continuously.

[bluewaters213]

Posted on March 10, 2013 at 20:44

Hello,

Thanks for your response. I configure TIM1 PWM running at 17.5KHz to trigger the ADC in center align mode.The Code for the adc handler is shown below.Do you have any idea of how I can fix the problem?. void ADC1_2_IRQHandler(void) {   if (ADC1->SR & ADC_SR_JEOC)  /*ADC Injected channel end of conversion Completed*/     {                         if (BEMF_DETECTION_FLAG == TRUE)               /*ZERO CROSSING DETECTION ENABLE*/         {          GPIOB->BSRR |= (1 << 9);                               BEMF[2] = BEMF[5] = ADC1->JDR1;          /*Read Phase A BEMF Value*/           BEMF[1] = BEMF[4] = ADC1->JDR2;          /*Read Phase B BEMF Value*/           BEMF[0] = BEMF[3] = ADC2->JDR1;          /*Read Phase C BEMF Value*/                        Neutral_Voltage = (BEMF[0] + BEMF[1] + BEMF[2])/3;/*Compute Motor Neutral Voltage */           temp = BEMF[CurrentCommutationStep];                              /*ZeroCrossing Evaluation*/     if (((ZC_Polarity == EDGE_RISING) && (temp > Neutral_Voltage)) ||              ((ZC_Polarity == EDGE_FALLING) && (temp < Neutral_Voltage)))           {                                 CommutationTime = TIM4->CNT;             /*Store ZeroCrossing Time*/                                /*Filter the Current Zero Crossing Time with earlier measurements through an IIR filter*/                    FiltererdCommutationTime = (IIR_COEFF_A * CommutationTime + IIR_COEFF_B * FiltererdCommutationTime)/                                      (IIR_COEFF_A + IIR_COEFF_B);                                 Commutation_TIM3_CCP1(FiltererdCommutationTime);/*Set TIM4 CCR1 to the Time of the Next Commutation*/                                 BEMF_DETECTION_FLAG = FALSE;             /*Disable BEMF Evaluation*/                                 }        }     GPIOB->BRR |= (1 << 9);            Current = ADC2->JDR2;                          /*Read Motor Current*/      ADC1->SR = ~ADC_SR_JEOC;                       /*Clear Injected channel Flag*/                   } } Thanks

[waclawek.jan]

Posted on March 11, 2013 at 10:39

Shouldn't the ADC2's interrupt source (JEOC) be checked/cleared, too?

JW