mmc_front_display/main/main.ino

#include <TFT_eSPI.h>
#include "config.h"
#include "display.h"

static TFT_eSPI tft = TFT_eSPI();
static bool lastSelectState = false;

// ---------------------------------------------------------------------------
// Show the correct screen for the current input state
// ---------------------------------------------------------------------------
static void applyState(bool sysSelect) {
    // HIGH = System A
    // LOW  = System B
    if (sysSelect) {
        displayShowSystemA(tft);
    } else {
        displayShowSystemB(tft);
    }
}

void setup() {
    // System select input — internal pull-up so the pin has a defined level
    // when nothing is connected (defaults to HIGH = System A)
    pinMode(PIN_SYS_SELECT, INPUT_PULLUP);

    // Backlight on
    pinMode(PIN_TFT_BL, OUTPUT);
    digitalWrite(PIN_TFT_BL, HIGH);

    displayInit(tft);
    displayShowLogo(tft); // animation handles its own 10 s timing

    lastSelectState = digitalRead(PIN_SYS_SELECT);
    applyState(lastSelectState);
}

void loop() {
    bool state = digitalRead(PIN_SYS_SELECT);
    if (state != lastSelectState) {
        lastSelectState = state;
        applyState(state);
    }
    delay(POLL_INTERVAL_MS);
}