timer interrupt

[arunl4g]

Posted on December 02, 2015 at 14:05

hi

i have configurd to get an interrupt nce the timer update . But it did not work, can anyone knows whats the problem.I am using stm32f429 discovery board... void timer_init() { /**** clock for the timer *****/ RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, ENABLE); // RCC->AHB2RSTR  |= timer2_RCC_Enable; /*** timebase init and nested vector init *****/ TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct; /**** timer has the delay of 45MHz *****/ TIM_TimeBaseStruct.TIM_ClockDivision = 0; TIM_TimeBaseStruct.TIM_CounterMode = TIM_CounterMode_Up ; TIM_TimeBaseStruct.TIM_Period =  1000000-1; // 1Mhz to 1hz  which equals to  1s TIM_TimeBaseStruct.TIM_Prescaler = 45-1;  //45 Mhz to 1 Mhz which equals to 1us TIM_TimeBaseStruct.TIM_RepetitionCounter = 0 ; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStruct); /**** Enable the timer ****/ /* start timer */ TIM_Cmd(TIM2, ENABLE); /**** interrupt ****/ NVIC_InitTypeDef NVIC_IntStruct; NVIC_IntStruct.NVIC_IRQChannel = TIM2_IRQn; NVIC_IntStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_IntStruct.NVIC_IRQChannelPreemptionPriority = 0; NVIC_IntStruct.NVIC_IRQChannelSubPriority = 1 ; NVIC_Init(&NVIC_IntStruct); /*** interrupt on nvic ******/ TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); }

[Tesla DeLorean]

Posted on December 02, 2015 at 17:24

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); // Enable the clock, not hold the peripheral in reset?

[arunl4g]

Posted on December 04, 2015 at 12:31

ok clive, i just wanna know whats mean holding the pheripheralin reset?... does it mean, stop giving clocks to pheriperal?

[arunl4g]

Posted on December 04, 2015 at 14:07

clive, 

could you give me what the  

RCC_APB1PeriphResetCmd do?

and what you mean by 

not hold the peripheral in reset?

i am newbie and learn on my own.

[Tesla DeLorean]

Posted on December 04, 2015 at 14:23

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //  Start the engine

RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, ENABLE); // Standing of the brakes RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, DISABLE); // Remove foot from brake Nothing is going to happen in the timer if you keep it in the reset state, and being synchronous logic, you need to have it's clock enabled.

[arunl4g]

Posted on December 04, 2015 at 14:31thank you clive.what happens when i give RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);and after that RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, DISABLE); ?any power saving ?. if possible please tell me when do i need to use pheripheral  reset command ?