22 lines
428 B
C
22 lines
428 B
C
#include <hardware/pwm.h>
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#include <pico/types.h>
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#include "const.h"
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#include "pwm.h"
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void pwm_isr(void) {
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static uint slice = -1, chan = -1;
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if (slice == -1) slice = pwm_gpio_to_slice_num(AUDIO_OUT);
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if (chan == -1) chan = pwm_gpio_to_channel(AUDIO_OUT);
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pwm_clear_irq(slice);
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// TODO:
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float sample = 0.0f;
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uint16_t level = (uint16_t)((sample + 1.0f) * 0.5f * 3400.0f);
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pwm_set_chan_level(slice, chan, level);
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}
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