TIM3 interrupt crashes then being initialized

[malikkleist]

Posted on October 19, 2011 at 11:53

Hi,

Can any please help me out here. I'm trying to set up a timer-interrupt, TIM3, for every second. But when I'm trying to initialize the TIM3 interrupt my system crashes :(I'm running @ 72MHzHere is my code for initializing the TIM3 interrupt:void initTIM3Irq(void){    NVIC_InitTypeDef NVIC_InitStructure;    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;    GPIO_InitTypeDef GPIO_InitStructure;    /* Enable clock for TIM3 - otherwise we can't configure it */    RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM3, ENABLE);    TIM_DeInit (TIM3);            // Deinitialize TIM3 to its default reset values.    // Basic timer initialization    TIM_TimeBaseStructInit (&TIM_TimeBaseInitStruct);        TIM_TimeBaseInitStruct.TIM_Period = 9999;     .    TIM_TimeBaseInitStruct.TIM_Prescaler = 7199;  // Prescaler value: Set to 1MHz = 1us clocking    TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Down;        TIM_TimeBaseInit (TIM3, &TIM_TimeBaseInitStruct);    /* TIM3 enable counter */    TIM_Cmd( TIM3, ENABLE );        /* Enable TIM3 Update interrupt */    TIM_ITConfig (TIM3, TIM_IT_Update, ENABLE);    /* Enable the TIM3 global interrupt */    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // changed from 0    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 15; // changed from 15    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    NVIC_Init (&NVIC_InitStructure);      /* Disable TIM3 clocks - to save power */    RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM3, DISABLE);         }Best regardsAMK

[domen23]

Posted on October 19, 2011 at 13:24

''crashes'' is unacceptable problem description from a coder.

You forgot to include the interrupt handler.

[Tesla DeLorean]

Posted on October 19, 2011 at 13:36

Need to enable the NVIC before enabling interrupts.

Need to leave the TIM3 clock enabled, otherwise it STOPS. Prescaler gets you to 10 KHz, not 1 MHz, update interrupt once per second. No interrupt handler provided.