#include <M5StickC.h>
#include <Wire.h>

#define CARDKB_ADDR 0x5F

void setup()
{
M5.begin();
Serial.begin(115200);
Wire.begin();
pinMode(5, INPUT);
digitalWrite(5, HIGH);
M5.Lcd.fillScreen(BLACK);
M5.Lcd.setRotation(3);
M5.Lcd.setCursor(1, 10);
M5.Lcd.setTextColor(YELLOW);
M5.Lcd.setTextSize(2);
M5.Lcd.printf("IIC Address: 0x5F\n");
M5.Lcd.printf(">>");
}
void loop()
{
Wire.requestFrom(CARDKB_ADDR, 1);
while(Wire.available())
{
char c = Wire.read(); // re ceive a byte as characterif
if (c != 0)
{
M5.Lcd.printf("%c", c);
Serial.println(c, HEX);
// M5.Speaker.beep();
}
}
// delay(10);
}