AudioMixer/main.c

#include "pins.h"
#include "encoder.h"
#include "lcd.h"
#include "hid_mixer.h"
#include "ui_mixer.h"
#include "protocol.h"

#include "pico/stdlib.h"
#include "pico/stdio_usb.h"
#include "hardware/adc.h"
#include "hardware/gpio.h"
#include "tusb.h"

#include <stdio.h>
#include <stdlib.h>

#define PIN_ONBOARD_LED 25
#define POT_ADC_INPUT   0
#define POT_DEADBAND_PCT 1

static encoder_t enc1;
static encoder_t enc2;
static int32_t last_pos1;
static int32_t last_pos2;

static void led_init(void) {
    gpio_init(PIN_ONBOARD_LED);
    gpio_set_dir(PIN_ONBOARD_LED, GPIO_OUT);
}

static void pot_init(void) {
    adc_init();
    adc_gpio_init(PIN_POT);
    adc_select_input(POT_ADC_INPUT);
}

static uint8_t pot_read_pct(void) {
    adc_select_input(POT_ADC_INPUT);
    uint32_t sum = 0;
    for (int i = 0; i < 8; i++) {
        sum += adc_read();
    }
    uint32_t raw = sum / 8u;
    return (uint8_t)((raw * 100u) / 4095u);
}

int main(void) {
    led_init();
    stdio_init_all();
    tusb_init();

    /*
     * Pump USB hard until mounted (COM appears). Never sleep 100ms between
     * tud_task — that breaks Windows enumeration again.
     */
    absolute_time_t mount_deadline = make_timeout_time_ms(3000);
    absolute_time_t next_blink = make_timeout_time_ms(80);
    bool led = false;
    while (!time_reached(mount_deadline) && !tud_mounted()) {
        tud_task();
        if (time_reached(next_blink)) {
            led = !led;
            gpio_put(PIN_ONBOARD_LED, led);
            next_blink = make_timeout_time_ms(80);
        }
        tight_loop_contents();
    }

    /* Optional: wait a bit for the serial monitor to open (still pumping). */
    absolute_time_t cdc_deadline = make_timeout_time_ms(8000);
    while (!time_reached(cdc_deadline) && !tud_cdc_connected()) {
        tud_task();
        if (time_reached(next_blink)) {
            led = !led;
            gpio_put(PIN_ONBOARD_LED, led);
            next_blink = make_timeout_time_ms(200);
        }
        tight_loop_contents();
    }
    gpio_put(PIN_ONBOARD_LED, 1);

    printf("\n=== Ausiomixer firmware ===\n");
    printf("FW=ui-v3 %s %s\n", __DATE__, __TIME__);
    printf("VID=0x%04X PID=0x%04X mounted=%d cdc=%d\n",
           AUSIO_USB_VID, AUSIO_USB_PID,
           (int)tud_mounted(), (int)tud_cdc_connected());
    stdio_flush();

    lcd_init();
    /* Skip RDID after init — bitbang read was corrupting the panel (bottom noise). */

    ui_mixer_init();
    hid_mixer_init();

    encoder_pins_t p1 = {
        .clk_gpio = PIN_ENC1_CLK,
        .dt_gpio = PIN_ENC1_DT,
        .sw_gpio = PIN_ENC1_SW,
        .invert_dir = true,
    };
    encoder_pins_t p2 = {
        .clk_gpio = PIN_ENC2_CLK,
        .dt_gpio = PIN_ENC2_DT,
        .sw_gpio = PIN_ENC2_SW,
        .invert_dir = false,
    };
    encoder_init(&enc1, &p1);
    encoder_init(&enc2, &p2);
    pot_init();

    last_pos1 = encoder_get_position(&enc1);
    last_pos2 = encoder_get_position(&enc2);

    mixer_state_t *st = hid_mixer_state();
    ui_mixer_draw(st);

    uint8_t last_pot = 0xFF;
    absolute_time_t next_pot = make_timeout_time_ms(30);

    while (true) {
        hid_mixer_task();

        encoder_poll(&enc1);
        encoder_poll(&enc2);

        int32_t p1pos = encoder_get_position(&enc1);
        int32_t p2pos = encoder_get_position(&enc2);
        if (p1pos != last_pos1) {
            int32_t d = p1pos - last_pos1;
            if (d > 127) {
                d = 127;
            }
            if (d < -127) {
                d = -127;
            }
            hid_mixer_add_enc1((int8_t)d);
            last_pos1 = p1pos;
        }
        if (p2pos != last_pos2) {
            int32_t d = p2pos - last_pos2;
            if (d > 127) {
                d = 127;
            }
            if (d < -127) {
                d = -127;
            }
            hid_mixer_add_enc2((int8_t)d);
            last_pos2 = p2pos;
        }

        if (encoder_btn_was_pressed(&enc1)) {
            hid_mixer_set_e1_sw(true);
        }
        if (encoder_btn_was_pressed(&enc2)) {
            hid_mixer_set_e2_sw(true);
        }

        if (time_reached(next_pot)) {
            uint8_t pct = pot_read_pct();
            if (last_pot == 0xFF || abs((int)pct - (int)last_pot) >= POT_DEADBAND_PCT) {
                hid_mixer_set_pot(pct);
                last_pot = pct;
            }
            next_pot = make_timeout_time_ms(40);
        }

        if (st->ui_dirty || ui_mixer_needs_tick()) {
            ui_mixer_draw(st);
            st->ui_dirty = false;
        }

        tight_loop_contents();
        sleep_us(200);
    }
}