How to configure Timer for STM8s as input capture compare and how to get the capture compare values in interrupt handler.?
I have configured the timer as below is its is correct and also in interrupt handler I am not getting time the values.
static void TIM3_Config(void)
{
/* TIM3 configuration:
- TIM3CLK is set to 16 MHz, the TIM2 Prescaler is equal to 16 so the TIM2 counter
clock used is 16 MHz / 16 = 1 000 000 Hz
- With 1 000 000 Hz we can generate time base:
max time base is 256us if TIM2_PERIOD = 255 --> (255 + 1) / 1 000 000 = 256us
min time base is 1us if TIM2_PERIOD = 1 --> ( 1 + 1) / 1 000 000 = 2us
- In this example we need to generate a time base equal to 10us
so TIM2_PERIOD = (0.000010 * 1000000 - 1) = 9 */
/* Time base configuration */
//TIM3_DeInit();//me
//TIM3_TimeBaseInit(TIM3_PRESCALER_16 , 9);
/* Config channel1 as input capture */
//TIM3_ICSELECTION_TRGI
TIM3_ICInit(TIM3_CHANNEL_2,TIM3_ICPOLARITY_RISING,TIM3_ICSELECTION_DIRECTTI,TIM3_ICPSC_DIV8, 0);//TIM3_CHANNEL_1//TIM3_ICPSC_DIV2
/* Clear TIM2 update flag */
TIM3_ClearFlag(TIM3_FLAG_CC2);//TIM3_FLAG_CC1
/* Enable update interrupt */
TIM3_ITConfig(TIM3_FLAG_CC2, ENABLE);//TIM3_IT_CC1
//------------------------------------------------------------
TIM3_UpdateRequestConfig(TIM3_UPDATESOURCE_REGULAR);//UPDATED
// TIM3->IER &= ~TIM3_IER_CC2IE;//Disable OC Compare
// TIM3->SR1 &= ~TIM3_SR1_CC2IF;//Clear Capture comapre flag
TIM3->IER |= TIM3_IER_CC2IE;//Enable Capture Compare
//-------------------------------------------------------------
TIM3_ClearITPendingBit(TIM3_FLAG_UPDATE);//added//TIM3_IT_CC2//TIM3_IT_UPDATE //TIM1_ClearFlag(TIM1_FLAG_CC1 | TIM1_FLAG_UPDATE);
/* enable interrupts */
enableInterrupts();
/* Enable TIM2 */
TIM3_CCxCmd(TIM3_CHANNEL_2, ENABLE);
//TIM3_GenerateEvent(TIM3_EVENTSOURCE_CC2);
TIM3_Cmd(ENABLE);
}
///------------------------Interrupt Handelr--------------------
if((TIM3->SR1 & TIM3_FLAG_CC2)!=0)//sr1
{
if(numberofcapture==0)
{
t1 = TIM3_GetCapture2();
// count_ms1=TIM3_GetCapture2(); //First Capture
numberofcapture=1;
// TIM3_ClearFlag(TIM3_FLAG_CC2);
}
else
{
t2 = TIM3_GetCapture2(); //Second Capture
numberofcapture=0;
}
TIM3_ClearFlag(TIM3_FLAG_CC2);
count_ms1 = ((t2 - t1));
}
}
Is this is correct to configure the timer to get the values as capture compare..?
----------------------------------Please Help------------------------------