Faces Keyboard3 Arduino Tutorial

#include <Arduino.h>
#include <M5Faces.h>
#include <M5Unified.h>

M5Faces_Keyboard3 faces;
String screen_text;

void redraw_screen()
{
    M5.Display.fillScreen(TFT_BLACK);
    M5.Display.setCursor(0, 0);
    M5.Display.print(">");
    M5.Display.print(screen_text);
}

void setup()
{
    Serial.begin(115200);
    screen_text.reserve(256);

    auto config           = M5.config();
    config.fallback_board = m5::board_t::board_M5StackCoreS3;
    M5.begin(config);

    const int i2c_sda = M5.getPin(m5::pin_name_t::in_i2c_sda);
    const int i2c_scl = M5.getPin(m5::pin_name_t::in_i2c_scl);
    if (!M5.In_I2C.isEnabled()) {
        M5.In_I2C.begin(I2C_NUM_1, i2c_sda, i2c_scl);
    }

    M5.Display.setRotation(1);
    M5.Display.setTextColor(TFT_GREEN, TFT_BLACK);
    M5.Display.setFont(&fonts::FreeMonoBold12pt7b);
    M5.Display.setTextSize(1);
    M5.Display.setTextWrap(true);
    M5.Display.setTextScroll(true);
    redraw_screen();

    if (faces.begin(&M5.In_I2C) != M5FACES_OK) {
        Serial.println("Keyboard3 init failed");
        M5.Display.print(" init failed");
        return;
    }

    Serial.println("Keyboard3 ready");
}

void loop()
{
    if (faces.update()) {
        const uint8_t raw = faces.getKey();
        const char value  = faces.getChar();
        const char* name  = M5Faces_Keyboard3::keyboard3_code_parse(raw);

        if (faces.isPrintable()) {
            Serial.printf("raw=0x%02X key='%c'\n", raw, value);
            screen_text += value;
            redraw_screen();
        } else {
            Serial.printf("raw=0x%02X key=%s\n", raw, name ? name : "UNKNOWN");
            if ((value == '\b' || raw == KEYBOARD3_KEY_DEL) && screen_text.length() > 0) {
                screen_text.remove(screen_text.length() - 1);
                redraw_screen();
            } else if (value == '\n') {
                screen_text += '\n';
                redraw_screen();
            } else if (value == '\t') {
                screen_text += "    ";
                redraw_screen();
            }
        }
    }
    delay(5);
}