EIE4-FYP/demo/audio.cpp

#include "audio"
#include <generated/csr.h>
#include <stdint.h>

#ifdef CSR_AUDIO_BASE
// Set all oscillators to (0Hz, sawtooth)
void reset_audio(void) {
	for (int i = 0; i < 32; i++) {
		audio_osc_write(i);
		audio_tf_write(0);
		audio_wav_write(0);
	}
}

// Set oscillator `osc` to waveform `wave`
void set_wave(uint32_t osc, uint32_t wave) {
	audio_osc_write(osc);
	audio_wav_write(wave);
}

// Set oscillator `osc` to frequency `freq`Hz
void set_freq(uint32_t osc, uint32_t freq) {
	audio_osc_write(osc);
	audio_tf_write(freq);
}

// Set oscillator `osc` to waveform `wave` at frequency `freq`Hz
void audio(uint32_t osc, uint32_t wave, uint32_t freq) {
	audio_osc_write(osc);
	audio_wav_write(wave);
	audio_tf_write(freq);
}

// Set oscillator `osc` to waveform `wave` at frequency `freq`Hz for `ms` milliseconds
void timed_freq(uint32_t osc, uint32_t freq, unsigned int ms) {
	audio_osc_write(osc);
	audio_tf_write(freq);
	busy_wait(ms);
	audio_tf_write(0);
}
#endif