/* p11_6.c Dead-time creation with CC0 and CC1 of TCC0
 *
 * See text for detailed description.
 *
 * PA08 = TCC0/WO[0], PA09 = TCC0/WO[1]
 *
 * Tested with Atmel Studio 7 v7.0.1006 and Keil MDK-ARM v5.21a.
 */

#include "samd21.h"

void TCC0_init(void);
void TCC1_init(void);

unsigned char* ARRAY_PORT_PINCFG0 = (unsigned char*)&REG_PORT_PINCFG0;
unsigned char* ARRAY_PORT_PMUX0 = (unsigned char*)&REG_PORT_PMUX0;

int main(void) {
    TCC0_init();

    while (1) {
    }
}

void TCC0_init(void) {
    REG_GCLK_CLKCTRL = 0x401A;      /* GCLK0 -> TCC0, TCC1 */
    REG_PM_APBCMASK |= 0x00000100;  /* enable TCC0 Clock in PM */
    REG_TCC0_CTRLA = 1;             /* reset */
    while (REG_TCC0_CTRLA & 1) {}   /* wait till out of reset */
    REG_TCC0_WAVE = 7;              /* dual-slope TOP PWM */
    REG_TCC0_PER = 5000;            /* period */
    REG_TCC0_CC0 = 2625;            /* pulse width for channel 0 */
    REG_TCC0_CC1 = 2375;            /* pulse width for channel 1 */
    REG_TCC0_DRVCTRL |= 0x00020000; /* invert ch1 output */
    REG_TCC0_CTRLA |= 2;            /* enable */

    ARRAY_PORT_PINCFG0[8] |= 1;     /* make PA08 output for TCC0/WO[0] */
    ARRAY_PORT_PINCFG0[9] |= 1;     /* make PA09 output for TCC0/WO[1] */
ARRAY_PORT_PMUX0[4] = 0x44;     /* PA08 = TCC0/WO[0], PA09 = TCC0/WO[1] */
}