stm32 timer captur

[mahdi zamani]

Posted on November 20, 2016 at 07:58

hey all

i configed timer 3 whit this .... formeasurement frecuncy in PA.7

void TIM3_Configuration(void){

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); TIM_ICInitTypeDef TIM_ICInitStructure; TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; 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_ICInit(TIM3, &TIM_ICInitStructure); /* TIM enable counter */ TIM_Cmd(TIM3, ENABLE); /* Enable the CC2 Interrupt Request */ TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE); NVIC_InitTypeDef NVIC_InitStructure; /* Enable the TIM3 global Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); }i read captur whit this code : frq=TIM_GetCapture2(TIM3); but not work :(((please help to me ...thanks

[Tesla DeLorean]

Posted on November 20, 2016 at 08:37

Ok, so what are you seeing when you read the capture register, and what were you expecting to see?

Tends to be a time stamp of the time base, which advances, so you'd need to delta it. Which STM32, they make a few versions these days.

[mahdi zamani]

Posted on November 20, 2016 at 08:55

void TIM3_Configuration(void){

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); TIM_ICInitTypeDef TIM_ICInitStructure; TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; 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_ICInit(TIM3, &TIM_ICInitStructure); /* TIM enable counter */ TIM_Cmd(TIM3, ENABLE); /* Enable the CC2 Interrupt Request */ TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE); NVIC_InitTypeDef NVIC_InitStructure; /* Enable the TIM3 global Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void assert_failed(uint8_t* file, uint32_t line) { /* User can add his own implementation to report the file name and line number, ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */ while (1) {} }    complete programme can edite my program tomeasurement frequncy at PA.6 and write it to ''FRQQ''?  i downloaded sample for this but i cant work on it :( sorry itsthe first my project whit stm32 ... thanks