Chain Series Devices Bus Communication Tutorial

#include "M5Chain.h"

#define RXD_PIN GPIO_NUM_5  // 47 for the other side of Chain DualKey
#define TXD_PIN GPIO_NUM_6  // 48 for the other side of Chain DualKey

Chain M5Chain;

chain_status_t chain_status;
device_list_t *device_list = NULL;
uint16_t device_count = 0;
uint8_t opr_status = 0;
uint8_t rgb_test[] = { 255, 255, 255 };

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("======================");
  Serial.println("M5Stack Chain Bus Test");

  M5Chain.begin(&Serial2, 115200, RXD_PIN, TXD_PIN);
  if (M5Chain.isDeviceConnected()) {
    Serial.println("Device is connected");
  } else {
    Serial.println("Device is NOT connected");
    return;
  }

  chain_status = M5Chain.getDeviceNum(&device_count);
  if (chain_status == CHAIN_OK) {
    device_list = (device_list_t *)malloc(sizeof(device_list_t));
    device_list->count = device_count;
    device_list->devices = (device_info_t *)malloc(sizeof(device_info_t) * device_count);
    Serial.println("Get device count succeeded");
  } else {
    Serial.printf("Get device count failed, chain status: %d\r\n", chain_status);
    return;
  }

  if (M5Chain.getDeviceList(device_list)) {
    Serial.println("Get device list succeeded\r\n");
  } else {
    Serial.println("Get device list failed");
    return;
  }

  if (device_list == NULL) {
    Serial.println("Device list is NULL");
    return;
  }
}

void loop() {
  Serial.print("Device count: ");
  Serial.println(device_list->count);

  for (int i = 0; i < device_list->count; i++) {
    Serial.print("- Device ID: ");
    Serial.print(device_list->devices[i].id);
    Serial.print(", type: ");
    switch (device_list->devices[i].device_type) {
      case CHAIN_UNKNOWN_TYPE_CODE:
        Serial.println("Unknown");
        break;
      case CHAIN_ENCODER_TYPE_CODE:
        Serial.println("Chain Encoder");
        break;
      case CHAIN_ANGLE_TYPE_CODE:
        Serial.println("Chain Angle");
        break;
      case CHAIN_KEY_TYPE_CODE:
        Serial.println("Chain Key");
        break;
      case CHAIN_JOYSTICK_TYPE_CODE:
        Serial.println("Chain Joystick");
        break;
      case CHAIN_TOF_TYPE_CODE:
        Serial.println("Chain ToF");
        break;
      case CHAIN_UART_TYPE_CODE:
        Serial.println("Chain UART");
        break;
      case CHAIN_SWITCH_TYPE_CODE:
        Serial.println("Chain Switch");
        break;
      case CHAIN_PEDAL_TYPE_CODE:
        Serial.println("Chain Pedal");
        break;
      case CHAIN_PIR_TYPE_CODE:
        Serial.println("Chain PIR");
        break;
      case CHAIN_MIC_TYPE_CODE:
        Serial.println("Chain Mic");
        break;
      case CHAIN_BUZZER_TYPE_CODE:
        Serial.println("Chain Buzzer");
        break;
    }

    chain_status = M5Chain.setRGBLight(device_list->devices[i].id, 100, &opr_status);
    // Device ID, LED brightness (0-100), operation status pointer
    if (chain_status == CHAIN_OK && opr_status) {
      Serial.println("Set RGB light succeeded");
    } else {
      Serial.printf("Set RGB light failed, chain status: %d, operation status: %d\r\n", chain_status, opr_status);
    }

    rgb_test[0] = random(0, 256);  // [0, 255]
    rgb_test[1] = random(0, 256);  // [0, 255]
    rgb_test[2] = random(0, 256);  // [0, 255]

    chain_status = M5Chain.setRGBValue(device_list->devices[i].id, 0, 1, rgb_test, 3, &opr_status);
    // Device ID, LED start index, LED count, RGB color, size of RGB color, operation status pointer
    if (chain_status == CHAIN_OK && opr_status) {
      Serial.println("Set RGB color succeeded");
    } else {
      Serial.printf("Set RGB color failed, chain status: %d, operation status: %d\r\n", chain_status, opr_status);
    }
  }

  Serial.println();
  delay(2000);
}