InputCapture.h

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#ifndef __INPUTCAPTURE_H__
#define __INPUTCAPTURE_H__
 
 
 
#define INPUTCAPTUREUSELFCLK 2
#define INPUTCAPTUREUSEMFCLK 4
#define INPUTCAPTUREUSEBUSCLK 8
 
void InputCapture_Init(uint32_t timerClkSrc, uint32_t timerClkPrescale, uint32_t priority);
 
 
// Power Domain PD1
// dual signal waves connected to
//   PB8  ELA  TA0_C0
//   PB12 ERA  TA0_C1
// initialize A0 for rising edge input capture interrupt
// for 32MHz bus clock, Timer clock is 32MHz
// for 40MHz bus clock, Timer clock is MCLK 40MHz
// for 80MHz bus clock, Timer clock is MCLK 80MHz
// Arm interrupts on rising edge of PB8, PB12
// interrupts will be enabled in main after all initialization
// timerClkSrc = 2 for 32768 Hz LFCLK
//             = 4 for 4MHz MFCLK
//             = 8 for 80/32/4 BUSCLK
// prescale divide clock by prescale+1, 0 to 255
// priority is 0(highest),1,2 or 3(lowest)
  /*
   * timerClkSrc could be 80 MHz, 40MHz, 32MHz, 4MHz, or 32767Hz
   * timerClkDivRatio = 1
   * timerClkFreq = (timerClkSrc / (timerClkDivRatio * (timerClkPrescale + 1)))
   * resolution = (timerClkDivRatio * (timerClkPrescale + 1)))/timerClkSrc
   * For example, source=LFCLK, prescale=255, resolution = 7.8125ms
   * For example, source=BUSCLK, prescale=79, resolution = 1us
   */
void InputCapture_InitDual(uint32_t timerClkSrc, uint32_t timerClkPrescale, uint32_t priority);
 
#endif // __INPUTCAPTURE_H__