rp2040_polysynth/pico_polysynth_2.c at master · audiobird/rp2040_polysynth · GitHub

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#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/multicore.h"
#include "midi_input_driver.h"
#include "voice_allocator.h"

#include "mcp4921.h"

#include "voice.h"

#define dac_init mcp4921_init

volatile bool wait = 1;

void midi_handle_note_on(struct midi_message * message)
{
    uint8_t voice = 0;

    if(!voice_allocator_note_on(message->channel, message->data.note_on.note, &voice))
    return;

    //yea. trigger da note
    voice_note_on(voice, message->channel, message->data.note_on.note, message->data.note_on.velocity);
}

void midi_handle_note_off(struct midi_message * message)
{
    uint8_t voice = 0;

    if (!voice_allocator_note_off(message->channel, message->data.note_off.note, &voice))
    return;

    //trigger the note off.
    voice_note_off(voice);
}

void midi_handle_cc(struct midi_message * message)
{
   voice_handle_cc(message->channel, message->data.control_change.controller, message->data.control_change.value);
}

void midi_handle_pitch_bend(struct midi_message * message)
{
    voice_handle_pitch_bend(message->channel, message->data.pitch_bend.value - 8192);
}

int32_t core_0_process_audio_rate()
{
    int32_t sample = 0;

    for (int x = 0; x < SYNTH_NUM_VOICES; x++)
    sample += voice_process_audio(x);

    return sample / SYNTH_NUM_VOICES;
}

void core_0_process_audio_params()
{
    for(int x = 0; x < SYNTH_NUM_VOICES; x++)
    voice_process_params(x);
}

void core_0()
{
    dac_init();

    int32_t audio_buffer[SAMPLE_BUFFER_SIZE];

    while(wait)
    ;

    wait = 1;

    while(1)
    {
        core_0_process_audio_params();

        for (int x = 0; x < SAMPLE_BUFFER_SIZE; x++)
        audio_buffer[x] = core_0_process_audio_rate();

        mcp4921_send_buffer(audio_buffer);
    }
}

void core_1()
{
    midi_input_driver_init();

    for(int voice = 0; voice < SYNTH_NUM_VOICES; voice++)
    {
        for (int timbre = 0; timbre < SYNTH_NUM_TIMBRES; timbre++)
        {
            voice_init(voice, timbre, 0);
        }
    }

    wait = 0;

    while(!wait)
    ;

    while(1)
    {
        midi_input_driver_read();
    }
}

int main()
{
    //set_sys_clock_khz(250, 1);
    /* do general setup here, leds and whatnot */
    multicore_launch_core1(core_1);
    core_0();
    return 0;
}