TC waveform output on SAM3X

TC waveform.c

void init_TC0_waveform()
{
  sysclk_enable_peripheral_clock(ID_TC0);
	tc_init(TC0, 0,
    TC_CMR_TCCLKS_TIMER_CLOCK4 |  // select clock source
    TC_CMR_WAVE |          // waveform mode
    TC_CMR_EEVT_XC0 |      // external event selection - enables TIOB output!
          
    TC_CMR_ASWTRG_SET |    // set A on timer start
    TC_CMR_ACPA_CLEAR |    // clear A on compare event A
    TC_CMR_ACPC_SET |      // set A on compare event C
          
    TC_CMR_BSWTRG_SET |    // set B on timer start
    TC_CMR_BCPB_CLEAR |    // clear B on compare event B
    TC_CMR_BCPC_SET |      // set B on compare event C
          
    TC_CMR_WAVSEL_UP_RC    // reset timer on event C
	);
	
	tc_write_ra(TC0, 0, 900000);
	tc_write_rb(TC0, 0, 700000);
	tc_write_rc(TC0, 0, 1000000);

	ioport_set_pin_mode(PIO_PB27_IDX, IOPORT_MODE_MUX_B); // TIOB0 - D13
	ioport_disable_pin(PIO_PB27_IDX);
  
	ioport_set_pin_mode(PIO_PB25_IDX, IOPORT_MODE_MUX_B); // TIOA0 - D2
	ioport_disable_pin(PIO_PB25_IDX);
  
  tc_start(TC0, 0);
}