Posted on August 31, 2012 at 11:22Many thanks Clive1..!!
I am using IAR workbench.
Do i need to use Remapping as you said in some earlier posts regarding timer input capture mode.
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); Heres te code for stm32l1xx_it
void TIM4_IRQHandler(void)
{
if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET)
{
/* Clear TIM4 Capture compare interrupt pending bit */
TIM_ClearITPendingBit(TIM4, TIM_IT_CC2);
if(CaptureNumber == 0)
{
/* Get the Input Capture value */
IC4ReadValue1 = TIM_GetCapture2(TIM4);
CaptureNumber = 1;
}
else if(CaptureNumber == 1)
{
/* Get the Input Capture value */
IC4ReadValue2 = TIM_GetCapture2(TIM4);
/* Capture computation */
if (IC4ReadValue2 > IC4ReadValue1)
{
Capture = (IC4ReadValue2 - IC4ReadValue1) - 1;
}
else if (IC4ReadValue2 < IC4ReadValue1)
{
Capture = ((0xFFFF - IC4ReadValue1) + IC4ReadValue2) - 1;
}
else
{
Capture = 0;
}
/* Frequency computation */
TIM4Freq = (uint32_t) SystemCoreClock / Capture;
CaptureNumber = 0;
}
}
}
