ATOMS3のMACアドレスをQRコードと文字列で表示する

m5atoms3-mac-address.cpp

#include <M5AtomS3.h>

const size_t ETH_ALEN = 6;
const uint16_t SPACING = 4;
const uint8_t FONT = 1;
const uint8_t FONT_HEIGHT = 8;
const uint8_t QR_VERSION = 1;

uint8_t macAddr[ETH_ALEN] = {0};
char macStr[ETH_ALEN * 3 + 1] = {0};

void setup(void) {
    esp_read_mac(macAddr, ESP_MAC_WIFI_STA);
    snprintf(macStr, sizeof(macStr), "%02X:%02X:%02X:%02X:%02X:%02X",
             macAddr[0], macAddr[1], macAddr[2], macAddr[3], macAddr[4],
             macAddr[5]);

    M5.begin();
    M5.Lcd.setRotation(2);
    M5.Lcd.fillScreen(TFT_WHITE);
    M5.Lcd.setTextColor(TFT_BLACK);
    M5.Lcd.qrcode(macStr, SPACING, SPACING / 2, M5.Lcd.width() - SPACING * 2,
                  QR_VERSION);
    M5.Lcd.drawCentreString(macStr, M5.Lcd.width() / 2,
                            M5.Lcd.height() - (FONT_HEIGHT + SPACING / 2),
                            FONT);
}

void loop(void) {
    M5.update();
}