9.1.3.3 Workflow

  1. Enable the TC module's capture pin: 
    ioport_set_pin_mode(PIN_TC_CAPTURE, PIN_TC_CAPTURE_MUX);
ioport_disable_pin(PIN_TC_CAPTURE);
  2. 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();
  3. Enable the TC interrupt using NVIC: 
    NVIC_DisableIRQ(TC_IRQn);
NVIC_ClearPendingIRQ(TC_IRQn);
NVIC_SetPriority(TC_IRQn, 0);
NVIC_EnableIRQ(TC_IRQn);
  4. Enable the capture channel interrupt: 
    tc_enable_interrupt(TC, TC_CHANNEL_CAPTURE, TC_IER_LDRBS);
  5. 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) {

    }
  6. 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);
  7. 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);