void __attribute__ ((interrupt)) TIMER1_IRQHandler() {
// Clear interrupt flag
*TIMER1_IFC = 1;
//check if at end of note, may go to next note
if ( counter >= current_note_length ) {
counter = 0;
note_counter++;
} else {
counter++;
}
//check if at end of song, resets values if true and end function
if ( note_counter >= current_song->length ) {
music_cleanup();
gpio_led_clear();
dac_disable();
timer_disable();
sleep_setup(0b110);
return;
}
//creates temp pointer to note, play that frequency
Note* n_temp = current_song->notes[note_counter];
int offset = (song_iterator % n_temp->length);
music_note_to_dac(n_temp, offset);
song_iterator++;
}
static void dac_setup(void)
{
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO5);
dac_disable(CHANNEL_2);
dac_disable_waveform_generation(CHANNEL_2);
dac_enable(CHANNEL_2);
dac_set_trigger_source(DAC_CR_TSEL2_SW);
}
static void dac_setup(void)
{
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO5);
dac_disable(CHANNEL_2);
dac_disable_waveform_generation(CHANNEL_2);
dac_enable(CHANNEL_2);
dac_set_trigger_source(DAC_CR_TSEL2_SW);
}
void funcgen_plat_output(int channel, bool enable) {
switch (channel) {
case 1: if (enable) {
dac_enable(CHANNEL_2);
} else {
dac_disable(CHANNEL_2);
}
break;
case 0:
default:
if (enable) {
dac_enable(CHANNEL_1);
} else {
dac_disable(CHANNEL_1);
}
break;
}
}
void sound_stop (void)
{
TCC0.INTCTRLA = TC_OVFINTLVL_OFF_gc;
dac_disable();
//Enable power reduction for TCC0
PR.PRPC |= 0x01;
WavFifo = 0; /* Unregister FIFO control structure */
}
void analogout_free(dac_t *obj)
{
MBED_ASSERT(obj);
struct system_pinmux_config pin_conf;
dac_disable(&dac_instance);
pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_UP;
pin_conf.powersave = false;
pin_conf.mux_position = SYSTEM_PINMUX_GPIO;
system_pinmux_pin_set_config(PA02, &pin_conf); /*PA02 is the only DAC pin available*/
}
void analogout_free(dac_t *obj)
{
MBED_ASSERT(obj);
struct system_pinmux_config pin_conf;
dac_disable(&(obj->dac_instance));
pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_UP;
pin_conf.powersave = false;
pin_conf.mux_position = SYSTEM_PINMUX_GPIO;
system_pinmux_pin_set_config(obj->pin, &pin_conf);
}
void dac_init(void)
{
rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_120MHZ]); //nastaveni globalnich hodin
rcc_periph_clock_enable(RCC_GPIOA); //pusteni hodin pro port A
rcc_periph_clock_enable(RCC_DAC); //pusteni hodin pro DAC
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO4); //pin4 portu A nako analogovy bez pullu/pulldown
dac_disable(CHANNEL_1); //zakazani kanalu 1 DAC
dac_disable_waveform_generation(CHANNEL_1); //bastaveni generovani signalu na kanalu 1 DAC
dac_enable(CHANNEL_1); //Povoleni DAC na kanalu 1
dac_set_trigger_source(DAC_CR_TSEL1_SW); //Triger kanalu 1 nastaven na softwarovy
}
//=======================================================================================
// audio dac ramp down
//=======================================================================================
void avi_audio_decode_rampdown(void)
{
dac_disable();
}