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https://github.com/supleed2/EIE4-FYP.git
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47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include "audio"
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#include <generated/csr.h>
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#include <stdint.h>
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#ifdef CSR_AUDIO_BASE
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// Normalise target frequency from float to (24.4 bit) fixed point
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static inline uint32_t n_tf(float freq) {
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return static_cast<uint32_t>(freq * 16.0f);
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}
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// Set all oscillators to (0Hz, sawtooth)
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void reset_audio(void) {
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for (int i = 0; i < 64; i++) {
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audio_osc_write(i);
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audio_tf_write(0);
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audio_wav_write(0);
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}
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}
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// Set oscillator `osc` to waveform `wave`
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void set_wave(uint32_t osc, wave_t wave) {
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audio_osc_write(osc);
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audio_wav_write(wave);
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}
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// Set oscillator `osc` to frequency `freq`Hz
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void set_freq(uint32_t osc, float freq) {
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audio_osc_write(osc);
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audio_tf_write(n_tf(freq));
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}
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// Set oscillator `osc` to waveform `wave` at frequency `freq`Hz
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void audio(uint32_t osc, wave_t wave, float freq) {
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audio_osc_write(osc);
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audio_wav_write(wave);
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audio_tf_write(n_tf(freq));
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}
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// Set oscillator `osc` to waveform `wave` at frequency `freq`Hz for `ms` milliseconds
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void timed_freq(uint32_t osc, float freq, unsigned int ms) {
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audio_osc_write(osc);
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audio_tf_write(n_tf(freq));
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busy_wait(ms);
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audio_tf_write(0);
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}
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#endif
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