I want to use Timer 1 as capture input for frequency measurement: ( STM32F207ZG)
void STMF2Timer_Configure(
void)
{
TIM_TimeBaseInitTypeDef sTIM_TimeBaseInitStruct;
TIM_ICInitTypeDef sTIM_ICInitTypeDef;
NVIC_InitTypeDef NVIC_InitStructure;
//! - TIM1 setup ------------------------------------------------------
//! Setup interrupt for TIM1.
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn; // Set config for TIM1_IRQ
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = STMF2PLATFORMCFG_TIM1_PREEMPTION_PRIORITY; //configLIBRARY_KERNEL_INTERRUPT_PRIORITY - 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = STMF2PLATFORMCFG_TIM1_SUB_PRIORITY;
NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE; // Enable
NVIC_Init(&NVIC_InitStructure); // ...
//! Enable clock for the timer TIM1.
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_DeInit(TIM1);
sTIM_ICInitTypeDef.TIM_Channel = TIM_Channel_1;
sTIM_ICInitTypeDef.TIM_ICPolarity = TIM_ICPolarity_Rising;
sTIM_ICInitTypeDef.TIM_ICSelection = TIM_ICSelection_DirectTI;
sTIM_ICInitTypeDef.TIM_ICPrescaler = TIM_ICPSC_DIV1;
sTIM_ICInitTypeDef.TIM_ICFilter = 0;
TIM_ICInit(TIM1,&sTIM_ICInitTypeDef);
sTIM_TimeBaseInitStruct.TIM_Prescaler = 99; // Period is frequency/(prescaler+1).
sTIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
sTIM_TimeBaseInitStruct.TIM_Period = 0;
sTIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
sTIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1,&sTIM_TimeBaseInitStruct);
//! Enable TIM1event interrupt generation.
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
/*! \brief Handles the timer TIM1 capture interrupt
*
* \return None
*
* \pre STMF2Timer_Configure() has been successfully called.
*/
void TIM1_CC_IRQHandler(
void)
{
Uint32 u32NewTimeStampus = 0u;
Uint32 u32LastTimeStampus = 0u;
Uint32 u8captureNumber = 0u;
/* Uint8 u8Port = 'G';
Uint32 u32Pin = 1;
//! Configure the pin as output
STMF2GPIO_ConfigurePin(u8Port, (Uint16) u32Pin, OUTPUT_PUSHPULL);
// Set pin
STMF2GPIO_SetPin(u8Port, (Uint16) u32Pin);
*/
if(TIM_GetFlagStatus(TIM1,TIM_FLAG_CC1) == 1)
{
TIM_ClearFlag(TIM1,TIM_FLAG_CC1);
if(u8captureNumber == 0)
{
u32NewTimeStampus = TIM_GetCapture1(TIM1); //The first capture
u32LastTimeStampus = u32NewTimeStampus;
u8captureNumber = 1;
}
else if(u8captureNumber == 1) //Treatment of second capture
{
if(TIM_GetFlagStatus(TIM1,TIM_FLAG_Update) != 1)//Treatment of two capture no overflow occurs
{
u32NewTimeStampus = TIM_GetCapture1(TIM1);
u32AbsTimeStampDiff = u32NewTimeStampus - u32LastTimeStampus; //If the calculation mode update events
}
else
{
TIM_ClearFlag(TIM1,TIM_FLAG_Update); //The update event
u32NewTimeStampus = TIM_GetCapture1(TIM1); //The second capture
u32AbsTimeStampDiff = 0xFFFF - u32LastTimeStampus + u32NewTimeStampus; //The second capture
}
}
}
u8captureNumber = 0;
}
I am expecting time stamp diff for further calculating frequency?
but I am not getting it right now
