master_clock/src/main.cpp

#include "Settings.h"
#include "hardware/structs/rosc.h"
#include "pico/multicore.h"
#include "pico/stdlib.h"
#include "pico/time.h"
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <hardware/gpio.h>
#include <math.h>
#include <pico/types.h>
#include <stdio.h>

#include "DisplayHandler.h"
#include "EncoderHandler.h"
#include "Gate.h"
#include "Mod.h"
#include "Settings.h"
#include "globals.h"
#include "hardware/pwm.h"

// Time based operations
struct repeating_timer bpm_timer = {0};
volatile uint8_t BPM = 60;
volatile bool PLAY = true;
volatile uint32_t period_us = 0;
volatile uint32_t MASTER_TICK;
volatile bool RUN = false;
const uint16_t PPQNOPTS[] = {1, 2, 4, 24, 48};
volatile uint8_t EXTPPQNIdx = 0;
volatile uint64_t last_clk_us = 0;
volatile uint64_t last_valid_clk_us;
volatile bool EXTERNAL_CLOCK = false;

ModMatrix matrix;

// Initialize Outputs
Gate out1(OUT_1_PIN, 0, 0, 1);
Gate out2(OUT_2_PIN, 1, 2, 3);
Gate out3(OUT_3_PIN, 2, 4, 5);
Gate out4(OUT_4_PIN, 3, 6, 7);
Gate out5(OUT_5_PIN, 4, 8, 9);
Gate out6(OUT_6_PIN, 5, 10, 11);
Gate out7(OUT_7_PIN, 6, 12, 13);
Gate out8(OUT_8_PIN, 7, 14, 15);

static Gate *outputs[] = {&out1, &out2, &out3, &out4,
                          &out5, &out6, &out7, &out8};

// Initialize Handlers
static DisplayHandler display_handler(outputs);
static EncoderHandler encoder_handler(&display_handler);

bool timer_callback(struct repeating_timer *t) {
  if (PLAY == 1) {
    MASTER_TICK += 1;
  }
  return true;
}

void init_timer(uint32_t period_us) {
  cancel_repeating_timer(&bpm_timer);
  add_repeating_timer_us(-(int64_t)period_us, timer_callback, NULL, &bpm_timer);
}

void update_period() {
  period_us = (uint32_t)(MINUTE_US / (uint32_t)BPM / PPQN);
  init_timer(period_us);
}

void update_BPM(bool up) {
  if (up) {
    BPM++;
  } else {
    BPM--;
  }

  update_period();

  for (auto g : outputs) {
    g->setWidth(g->width);
  }

  if (!EXTERNAL_CLOCK) {
    init_timer(period_us);
  } else {
    cancel_repeating_timer(&bpm_timer);
  }
}

void core1_entry() {
  multicore_fifo_pop_blocking();
  multicore_lockout_victim_init();

  char buffer[32];

  while (true) {
    display_handler.render();
  }
}

void full_save() {
  for (int i = 0; i < 8; i++) {
    outputs[i]->pack(globalSettings.configs[i]);
  }

  globalSettings.bpm = BPM;
  globalSettings.play = PLAY;
  globalSettings.run = RUN;
  globalSettings.ppqnidx = EXTPPQNIdx;

  memcpy(globalSettings.slots, matrix.slots, sizeof(ModSlot) * 16);

  save();
}

void setup_outs() {

  for (auto g : outputs) {
    gpio_init(g->pin);
    gpio_set_dir(g->pin, GPIO_OUT);

    gpio_set_function(g->pin, GPIO_FUNC_PWM);
    uint slice_num = pwm_gpio_to_slice_num(g->pin);
    pwm_set_wrap(slice_num, 1023);
    pwm_set_clkdiv(slice_num, 1.0f);

    pwm_set_gpio_level(g->pin, 0);
    pwm_set_enabled(slice_num, true);
    g->setLen(period_us);
    g->setupPatches();
  }
}

void handle_outs() {
  matrix.process(outputs, 8);
  for (Gate *g : outputs) {
    g->turnOn();
    g->update();
  }
}

void gpio_callback(uint gpio, uint32_t events) {
  // CLK LOGIC
  if (gpio == IN_CLK_PIN && (events & GPIO_IRQ_EDGE_RISE)) {
    uint64_t now = to_us_since_boot(get_absolute_time());

    if (now - last_valid_clk_us < 5000) {
      return;
    }
    last_valid_clk_us = now;

    uint16_t incomingPPQN;
    if (last_clk_us > 0) {
      uint64_t diff = now - last_clk_us;
      incomingPPQN = PPQNOPTS[EXTPPQNIdx];
      float calculatedBPM = 60000000.0f / (float)(diff * incomingPPQN);

      if (calculatedBPM >= 30 && calculatedBPM <= 255) {
        if (fabsf((float)BPM - calculatedBPM) > 0.5f) {
          BPM = (uint8_t)(calculatedBPM + 0.5f);

          update_period();
          for (auto g : outputs) {
            g->setWidth(g->width);
          }
        }
      }
    }
    MASTER_TICK += (PPQN / incomingPPQN);
    last_clk_us = now;
  }

  if (gpio == IN_RUN_PIN) {
    if (RUN) {
      if (events & GPIO_IRQ_EDGE_RISE) {
        PLAY = true;
      } else if (events & GPIO_IRQ_EDGE_FALL) {
        PLAY = false;
      }
    }
  }

  if (gpio == ENCODER_SW_PIN) {
    uint64_t now = to_us_since_boot(get_absolute_time());
    static uint64_t last_sw_time = 0;
    if (now - last_sw_time > 200000) { // 200ms debounce
      display_handler.handleClick();
      last_sw_time = now;
    }
  }
}

void setup_ins() {
  // SETUP RUN
  gpio_init(IN_RUN_PIN);
  gpio_set_dir(IN_RUN_PIN, GPIO_IN);
  gpio_pull_down(IN_RUN_PIN);
  gpio_set_irq_enabled_with_callback(IN_RUN_PIN,
                                     GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL,
                                     true, &gpio_callback);

  // SETUP CLOCK
  gpio_init(IN_CLK_PIN);
  gpio_set_dir(IN_CLK_PIN, GPIO_IN);
  gpio_pull_down(IN_CLK_PIN);
  // Add to existing callback
  gpio_set_irq_enabled(IN_CLK_PIN, GPIO_IRQ_EDGE_RISE, true);

  // SETUP CV INS
}

int main() {
  stdio_init_all();
  sleep_ms(200);

  bool loaded_defaults = load();

  display_handler.setup();
  encoder_handler.setup();

  setup_outs();

  if (!loaded_defaults) {
    for (int i = 0; i < 16; i++) {
      matrix.slots[i] = globalSettings.slots[i];
    }

    BPM = globalSettings.bpm;
    PLAY = globalSettings.play;
    RUN = globalSettings.run;
    EXTPPQNIdx = globalSettings.ppqnidx;
  }

  for (int i = 0; i < 8; i++) {
    outputs[i]->unpack(globalSettings.configs[i]);
  }

  multicore_launch_core1(core1_entry);
  multicore_fifo_push_blocking(1);

  update_period();
  srand(rosc_hw->randombit);

  bool lastPlayState = false;

  setup_ins();

  if (RUN) {
    PLAY = false;
  }

  while (true) {
    encoder_handler.update();

    if (PLAY) {
      handle_outs();
    } else {
      for (Gate *g : outputs) {
        g->turnOff();
      }
    }

    lastPlayState = PLAY;
  }
}