Question
STM32F103 PWM Interrupt not working (UPDATED)
Posted on August 06, 2015 at 09:43
Hi all
I have a problem. I am trying to update the PWM duty cycle using TIM1 update interrupt. In the interrupt I write values to the TIM1 CCR1, CCR2 and CCR3 registers. When I run the code nothing happens.Have I misconfigured the interrupt or is there something else wrong?Thank you for your time.Christiaan&sharpinclude ''stm32f10x.h''TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;TIM_OCInitTypeDef TIM_OCInitStructure;TIM_BDTRInitTypeDef TIM_BDTRInitStructure;NVIC_InitTypeDef NVIC_InitStructure;int TimerPeriod = 0, n = 0;int Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0;uint16_t pulse_width = 0;void RCC_Configuration(void);void GPIO_Configuration(void);void TIM1_IRQHandler(void);void PWM_SetDC(uint16_t dutycycle);void Delay(__IO uint32_t nCount);int main(void){ /* System Clocks Configuration */ SystemInit(); RCC_Configuration(); /* GPIO Configuration */ GPIO_Configuration(); /* TIM1 Configuration --------------------------------------------------- */ /* Compute the value to be set in ARR regiter to generate signal frequency at 10 Khz */ TimerPeriod = (SystemCoreClock / 22500); /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */ Channel1Pulse = (TimerPeriod / 6); /* Compute CCR2 value to generate a duty cycle at 50% for channel 2 and 2N with 60 degree phase shift*/ Channel2Pulse = (TimerPeriod / 6) + (TimerPeriod / 3); /* Compute CCR3 value to generate a duty cycle at 50% for channel 3 and 3N with 120 degree phase shift*/ Channel3Pulse = (TimerPeriod / 6) + ((TimerPeriod * 2) / 3); /* Interrupt configuration */ NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* Time Base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = TimerPeriod - 1; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); /* Channel 1, 2,3 and 4 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; TIM_OC1Init(TIM1, &TIM_OCInitStructure); TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; TIM_OC2Init(TIM1, &TIM_OCInitStructure); TIM_OCInitStructure.TIM_Pulse = Channel3Pulse; TIM_OC3Init(TIM1, &TIM_OCInitStructure); /* Dead time configuration (3.7 us) */ TIM_BDTRInitStructure.TIM_DeadTime = 183; TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); /* TIM1 IT Enable */ TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE); /* TIM1 counter enable */ TIM_Cmd(TIM1, ENABLE); /* TIM1 Main Output Enable */ TIM_CtrlPWMOutputs(TIM1, ENABLE); while (1) { PWM_SetDC(pulse_width++); if (pulse_width >= 200) { pulse_width = 0; } Delay(100); }}void RCC_Configuration(void){ /* TIM1, GPIOA, GPIOB and AFIO clocks enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); RCC_APB2PeriphResetCmd(RCC_APB2Periph_TIM1,DISABLE);}/* Configure the TIM1 Pins. */void GPIO_Configuration(void){ GPIO_InitTypeDef GPIO_InitStructure; /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* GPIOB Configuration: Channel 1N, 2N and 3N as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_Init(GPIOB, &GPIO_InitStructure);}void TIM1_IRQHandler(void){ if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit(TIM1, TIM_IT_Update); }}void PWM_SetDC(uint16_t dutycycle){ TIM1->CCR1 = dutycycle; TIM1->CCR2 = dutycycle; TIM1->CCR3 = dutycycle;}void Delay(__IO uint32_t nCount){ while(nCount--) { }} #tim1 #pwm #interrupt #stm32f103