+struct DacHardware
+{
+ uint16_t channels;
+ bool end;
+};
+
+struct DacHardware dac_hw;
+
+#if CONFIG_DAC_TIMER == DACC_TRGSEL_TIO_CH0 /* Select Timer counter TIO Channel 0 */
+ #define DAC_TC_ID TC0_ID
+ #define DAC_TC_CCR TC0_CCR0
+ #define DAC_TC_IDR TC0_IDR0
+ #define DAC_TC_CMR TC0_CMR0
+ #define DAC_TC_SR TC0_SR0
+ #define DAC_TC_RA TC0_RA0
+ #define DAC_TC_RC TC0_RC0
+#elif CONFIG_DAC_TIMER == DACC_TRGSEL_TIO_CH1 /* Select Timer counter TIO Channel 1 */
+ #define DAC_TC_ID TC1_ID
+ #define DAC_TC_CCR TC0_CCR1
+ #define DAC_TC_IDR TC0_IDR1
+ #define DAC_TC_CMR TC0_CMR1
+ #define DAC_TC_SR TC0_SR1
+ #define DAC_TC_RA TC0_RA1
+ #define DAC_TC_RC TC0_RC1
+#elif CONFIG_DAC_TIMER == DACC_TRGSEL_TIO_CH2 /* Select Timer counter TIO Channel 2 */
+ #define DAC_TC_ID TC2_ID
+ #define DAC_TC_CCR TC0_CCR2
+ #define DAC_TC_IDR TC0_IDR2
+ #define DAC_TC_CMR TC0_CMR2
+ #define DAC_TC_SR TC0_SR2
+ #define DAC_TC_RA TC0_RA2
+ #define DAC_TC_RC TC0_RC2
+#elif CONFIG_DAC_TIMER == DACC_TRGSEL_PWM0 || CONFIG_DAC_TIMER == DACC_TRGSEL_PWM1
+ #error unimplemented pwm triger select.
+#endif
+
+INLINE void tc_setup(uint32_t freq)
+{
+ pmc_periphEnable(DAC_TC_ID);
+
+ /* Disable TC clock */
+ DAC_TC_CCR = TC_CCR_CLKDIS;
+ /* Disable interrupts */
+ DAC_TC_IDR = 0xFFFFFFFF;
+ /* Clear status register */
+ volatile uint32_t dummy = DAC_TC_SR;
+ (void)dummy;
+
+ /*
+ * Setup the timer counter:
+ * - select clock TCLK1
+ * - enable wave form mode
+ * - RA compare effect SET
+ * - RC compare effect CLEAR
+ * - UP mode with automatic trigger on RC Compare
+ */
+ DAC_TC_CMR = BV(TC_TIMER_CLOCK1) | BV(TC_CMR_WAVE) | TC_CMR_ACPA_SET | TC_CMR_ACPC_CLEAR | BV(TC_CMR_CPCTRG);
+
+ /* Compute the sample frequency */
+ uint32_t rc = (CPU_FREQ / 8) / (freq * 1000);
+ DAC_TC_RC = rc;
+ DAC_TC_RA = 50 * rc / 100;
+}