TIM2_IRQHandler never executes??!!

[srinath3142]

Posted on November 13, 2011 at 12:40

Hello everyone,

I have tried to use GPIO PortB, Pin 10 (which i believe can use AF TIM2_Channel 3) to capture PWM signals on my stm32f2.  I am using the standard peripheral lib. I am having issues with the TIM2_IRQHandler never being called/executed.  Below is the code fragment to setup the GPIO, NVIC and TIM for PWMIN  -      GPIO_InitTypeDef GPIO_InitStructure;     NVIC_InitTypeDef NVIC_InitStructure;     TIM_ICInitTypeDef  TIM_ICInitStructure;     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);     GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_10;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // Unclear on this setting     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;     GPIO_Init(GPIOB, &GPIO_InitStructure);     GPIO_PinAFConfig(GPIOB, GPIO_PinSource10  , GPIO_AF_TIM2);     NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;     NVIC_Init(&NVIC_InitStructure);     TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;     TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;     TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;     TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;     TIM_ICInitStructure.TIM_ICFilter = 0x0;       TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);         TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);       /* Select the slave Mode: Reset Mode */     TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);     TIM_SelectMasterSlaveMode(TIM2,TIM_MasterSlaveMode_Enable);     /* TIM enable counter */     TIM_Cmd(TIM2, ENABLE);     /* Enable the CC2 Interrupt Request */     TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE); The IRQ Handler is as below (note num_vists is a global variable and it never seems to increase ) - void TIM2_IRQHandler(void) {   TIM_ClearFlag(PPM_TIM,TIM_FLAG_CC1);  TIM_ClearFlag(PPM_TIM,TIM_FLAG_CC2);  TIM_ClearFlag(PPM_TIM,TIM_FLAG_CC3);  TIM_ClearFlag(PPM_TIM,TIM_FLAG_CC4);  TIM_ClearITPendingBit(PPM_TIM, TIM_IT_CC2);  TIM_ClearITPendingBit(PPM_TIM, TIM_IT_CC1);  num_vists++;}Can anyone help me figure out what I have done wrong (i.e. why is the IRQ handler never visited).Regards,Srinath #stm32f2-pwm-input-capture

[Tesla DeLorean]

Posted on November 13, 2011 at 13:08

     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // Unclear on this setting

Slew-rate control for pin. ie Drive Strength or SPEED. Not of consequence for an input.     TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;      TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);        /* Enable the CC2 Interrupt Request */      TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);  What CHANNEL are you using/configuring?

[csdominik]

Posted on November 14, 2011 at 01:44 1st change this: TIM_ICInitStructure.TIM_Channel = TIM_Channel_3; to: TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; // because channel 1 and 2 is used to detect a pwm input   Try if it works, if not, try to change :      TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);       TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);       TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);                  TIM_Cmd(TIM2, ENABLE);       TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);