ＬｏＲａモジュール評価ボード　Ｅ２２０－９００Ｔ２２Ｓ（ＪＰ）－ＥＶ１の伝送レート変更。M5Atom Lite使用

main.cpp

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


#define LORA_M0_PIN   21
#define LORA_M1_PIN   25
#define LORA_RX_PIN   23
#define LORA_TX_PIN   19

#define BAUDRATE_1200     0x00
#define BAUDRATE_2400     0x20
#define BAUDRATE_4800     0x40
#define BAUDRATE_9600     0x60
#define BAUDRATE_19200    0x80
#define BAUDRATE_38400    0xa0
#define BAUDRATE_57600    0xc0
#define BAUDRATE_115200   0xe0

#define BW_125            0x00
#define BW_250            0x01
#define BW_500            0x02

#define SF_5              0x00
#define SF_6              0x04
#define SF_7              0x08
#define SF_8              0x0c
#define SF_9              0x10
#define SF_10             0x14
#define SF_11             0x18


void setLoraMode(int mode) {
  pinMode(LORA_M0_PIN, OUTPUT);
  pinMode(LORA_M1_PIN, OUTPUT);
  digitalWrite(LORA_M0_PIN, mode & 0x1 != 0);
  digitalWrite(LORA_M1_PIN, mode & 0x2 != 0);
}

void write_register(uint8_t addr, uint8_t* params, int length) {
  Serial.printf("write addr: %d\r\n", addr);
  Serial.printf(">> C0 %02X %02X", addr, length);
  Serial2.write(0xc0);
  Serial2.write(addr);
  Serial2.write(length);
  for (int i = 0; i < length; i++) {
    char ch = params[i];
    Serial2.write(ch);
    Serial.printf(" %02X", ch);
  }

  char n = 3 + length;
  char buf[n];
  char *pt = buf;
  char c = 0;

  Serial.printf("\r\n>>");
  while (c < n ){
    if (Serial2.available()) {
      char ch = Serial2.read();
      Serial.printf(" %02X", ch);
      *pt++ = ch;
      c++;
    }
  }
  Serial.println("");
}

void read_register(uint8_t addr, uint8_t* params, int length) {
  Serial.printf("read addr: %d\r\n", addr);
  Serial.printf(">> C1 %02X %02X", addr, length);
  Serial2.write(0xc1);
  Serial2.write(addr);
  Serial2.write(length);

  char n = 3 + length;
  char buf[n];
  char *pt = buf;
  char c = 0;

  Serial.printf("\r\n>>");
  while (c < n ){
    if (Serial2.available()) {
      char ch = Serial2.read();
      Serial.printf(" %02X", ch);
      *pt++ = ch;
      c++;
    }
  }
  Serial.println("");
}

void setup() {
  M5.begin();
  Serial.begin(115200);
  Serial2.begin(9600, SERIAL_8N1, LORA_RX_PIN, LORA_TX_PIN);
  setLoraMode(3);

  delay(20000);

  uint8_t params[10];
  read_register(2, params, 1);

  params[0] = BAUDRATE_9600 | BW_125 | SF_5;
  write_register(2, params, 1);
}

void loop() {
  delay(10);
}

platformio.ini

[env:m5stack-atom]
platform = espressif32
board = m5stack-atom
framework = arduino
monitor_speed = 115200
lib_deps =
  m5stack/M5Unified@^0.1.4
  ArduinoJson@^6.21.0