obniz/parts/Grove/Grove_MP3/index.js

obniz sdk for javascript

class Grove_MP3 {
  constructor() {
    this.keys = ['vcc', 'gnd', 'mp3_rx', 'mp3_tx'];
    this.requiredKeys = ['mp3_rx', 'mp3_tx'];

    this.ioKeys = this.keys;
    this.displayName = 'MP3';
    this.displayIoNames = { mp3_rx: 'MP3Rx', mp3_tx: 'MP3Tx' };
  }

  static info() {
    return {
      name: 'Grove_MP3',
    };
  }

  wired(obniz) {
    this.obniz = obniz;
    obniz.setVccGnd(this.params.vcc, this.params.gnd, '5v');

    this.my_tx = this.params.mp3_rx;
    this.my_rx = this.params.mp3_tx;

    this.uart = this.obniz.getFreeUart();
  }

  async initWait(strage) {
    this.uart.start({
      tx: this.my_tx,
      rx: this.my_rx,
      baud: 9600,
    });
    await this.obniz.wait(100);
    this.uartSend(0x0c, 0);
    await this.obniz.wait(500);
    this.uartSend(0x0b, 0);
    await this.obniz.wait(100);

    if (strage) {
      if (strage == 'usb') {
        this.uartSend(0x09, 1);
      } else if (strage == 'sd') {
        this.uartSend(0x09, 2);
      }
    } else {
      this.uartSend(0x09, 2);
    }
    await this.obniz.wait(200);
  }

  setVolume(vol) {
    if (vol >= 0 && vol <= 31) {
      this.uartSend(0x06, vol);
    }
  }

  volUp() {
    this.uartSend(0x04, 0);
  }

  volDown() {
    this.uartSend(0x05, 0);
  }

  play(track, folder) {
    //if (!folder) folder = {};
    if (folder) {
      this.uart.send([0x7e, 0xff, 0x06, 0x0f, 0x00, folder, track, 0xef]);
    } else {
      // Play 'MP3' folder
      this.uartSend(0x12, track);
    }
  }

  stop() {
    this.uartSend(0x16, 0);
  }

  pause() {
    this.uartSend(0x0e, 0);
  }

  resume() {
    this.uartSend(0x0d, 0);
  }

  next() {
    this.uartSend(0x01, 0);
  }

  prev() {
    this.uartSend(0x02, 0);
  }

  uartSend(command, param) {
    let paramM = param >> 8;
    let paramL = param & 0xff;
    this.uart.send([0x7e, 0xff, 0x06, command, 0x01, paramM, paramL, 0xef]);
    let response = this.uart.readBytes();
    return response;
    //return response;
  }
}
if (typeof module === 'object') {
  module.exports = Grove_MP3;
}