ＬｏＲａモジュール評価ボード　Ｅ２２０－９００Ｔ２２Ｓ（ＪＰ）－ＥＶ１を使ったLoRa通信送信側 M5AtomS3使用

main.cpp

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

#define LORA_RX_PIN   7
#define LORA_TX_PIN   6
#define GPS_RX_PIN    38
#define GPS_TX_PIN    39

#define REC_BUF_SIZE    128

static char gps_rec_buf[REC_BUF_SIZE];
static char gps_rec_buf_idx = 0;

static double rec_time;
static double latitude;
static double longitude;


double to_decimal(double v) {
  int a = v;
  int b = a / 100;
  int c = a % 100;
  double d = v - a;
  return (double)b + ((double)c + d) / 60.0;
}

bool analizeRmc(char *str) {
  int len = strlen(str);
  if (len <66) { return false; } 
  if (str[17] != 'A') { return false; }

  char buf[REC_BUF_SIZE];
  strncpy(buf, str, REC_BUF_SIZE);

  int i = 0;
  char *pt;

  pt = strtok(buf, ",");
  while (pt != NULL) {
    //Serial.println(pt);
    switch (i) {
      case 1:
        rec_time = atof(pt);
      case 3:
        latitude = to_decimal(atof(pt));
        break;
      case 5:
        longitude = to_decimal(atof(pt));
        break;
      default:
        break;
    }
    if (5 <= i++) {
      break;
    }
    pt = strtok(NULL, ",");
  }
  USBSerial.printf("lat: %f, log: %f\r\n", latitude, longitude);
  return true;
}

void display() {
  int w = M5.Display.width();
  int h = M5.Display.height();
  M5.Display.setColor(BLACK);
  M5.Display.fillRect(0, 0, w, h);

  M5.Display.setCursor(1, 1);
  M5.Display.setTextColor(GREEN);
  M5.Display.println("lat:");
  M5.Display.setTextColor(WHITE);
  M5.Display.printf(" %.5f\r\n", latitude);
  M5.Display.setTextColor(GREEN);
  M5.Display.println("log:");
  M5.Display.setTextColor(WHITE);
  M5.Display.printf(" %.5f\r\n", longitude);
}

void setup() {
  auto cfg = M5.config();

  cfg.external_display.module_display = true;

  M5.begin(cfg);
  M5.Display.setTextSize(2);
  display();

  USBSerial.begin(115200);
  Serial1.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
  Serial2.begin(9600, SERIAL_8N1, LORA_RX_PIN, LORA_TX_PIN);
  delay(1000);

  Serial1.println("$PUBX,40,GSA,0,0,0,0,0,0*4E");
  Serial1.println("$PUBX,40,GLL,0,0,0,0,0,0*5C");
  Serial1.println("$PUBX,40,GGA,0,0,0,0,0,0*5A");
  Serial1.println("$PUBX,40,GSV,0,0,0,0,0,0*59");
  Serial1.println("$PUBX,40,VTG,0,0,0,0,0,0*5E");
  Serial1.println("$PUBX,40,RMC,0,3,0,0,0,0*44");
}

void loop() {
  if (Serial1.available()) {
    int ch = Serial1.read();
    if (gps_rec_buf_idx < REC_BUF_SIZE) {
      gps_rec_buf[gps_rec_buf_idx++] = ch;

    }

    USBSerial.write(ch);
    
    // 1行受信
    if (ch == '\n') {
      gps_rec_buf[gps_rec_buf_idx++] = '\0';
      gps_rec_buf_idx = 0;
      if (analizeRmc(gps_rec_buf)) {
        Serial2.printf("%.2f,%.5f,%.5f\r\n", rec_time, latitude, longitude);
      }
      display();
    }
  }
  delay(10);
}

platformio.ini

[env:ATOMS3]
platform = espressif32@5.2.0
framework = arduino
platform_packages = platformio/framework-arduinoespressif32@^3.20005.220925
board = esp32-s3-devkitc-1
lib_ldf_mode = deep
monitor_speed = 115200
upload_speed = 1500000
board_build.f_cpu = 240000000L
board_build.f_flash = 80000000L
board_build.flash_mode = dio
build_flags = 
	-DCORE_DEBUG_LEVEL=3
	-Iinclude
lib_deps =
  m5stack/M5Unified@^0.1.4