Workflow

Enable the TC module's capture pin:

ioport_set_pin_mode(PIN_TC_CAPTURE, PIN_TC_CAPTURE_MUX);
ioport_disable_pin(PIN_TC_CAPTURE);

Initialize the capture channel to the following:

• Load RA on the rising edge of TIOA

• Load RB on the falling edge of TIOA

• Set the external trigger to TIOA

• Set the external trigger to falling edge

  tc_capture_initialize();
  

Enable the TC interrupt using NVIC:

NVIC_DisableIRQ(TC_IRQn);
NVIC_ClearPendingIRQ(TC_IRQn);
NVIC_SetPriority(TC_IRQn, 0);
NVIC_EnableIRQ(TC_IRQn);

Enable the capture channel interrupt:

tc_enable_interrupt(TC, TC_CHANNEL_CAPTURE, TC_IER_LDRBS);

In the TC_Handler() function, the load. RB interrupt can be checked by:

if ((tc_get_status(TC, TC_CHANNEL_CAPTURE) & TC_SR_LDRBS) == TC_SR_LDRBS) {

} 

In the TC_Handler() function, the RA value. can be read by:

uint32_t gs_ul_captured_ra; 

gs_ul_captured_ra = tc_read_ra(TC, TC_CHANNEL_CAPTURE);

In the TC_Handler() function, the RB value. can be read by:

uint32_t gs_ul_captured_rb; 

gs_ul_captured_rb = tc_read_rb(TC, TC_CHANNEL_CAPTURE);