#include <M5EPD.h>
#include <TinyGPS++.h>

  static const uint32_t GPSBaud = 9600;

TinyGPSPlus gps;
HardwareSerial ss(2);

M5EPD_Canvas canvas(&M5.EPD);

char latStr[10];
char lonStr[10];
char speedStr[10];

void setup() {

  M5.begin();
  M5.EPD.SetRotation(0);
  M5.EPD.Clear(true);

  ss.begin(GPSBaud, SERIAL_8N1, 19, 18);

  canvas.createCanvas(960, 540);
  canvas.setTextSize(3);
  canvas.clear();
}

void loop() {

  int b = ss.available();

  while (b > 0) {

    gps.encode(ss.read());

    double lat = gps.location.lat();
    double lon = gps.location.lng();
    double speed = gps.speed.kmph();

    dtostrf(lat, 2, 2, latStr);
    dtostrf(lon, 2, 2, lonStr);
    dtostrf(speed, 2, 2, speedStr);

    canvas.clear();
    canvas.drawString("Lat:   " + String(latStr), 50, 100);
    canvas.drawString("Lon:   " + String(lonStr), 50, 150);
    canvas.drawString("Speed: " + String(speedStr), 50, 200);
    canvas.pushCanvas(0, 0, UPDATE_MODE_DU4);
  }
}