obniz/parts/TemperatureSensor/i2c/AMG8833/index.js

obniz sdk for javascript

class AMG8833 {
  constructor() {
    this.requiredKeys = [];
    this.keys = ['vcc', 'gnd', 'sda', 'scl', 'address'];

    this.ioKeys = ['vcc', 'gnd', 'sda', 'scl'];
    this.commands = {};
    this.commands.mode_normal = [0x00, 0x00];
    this.commands.reset_flag = [0x01, 0x30];
    this.commands.reset_initial = [0x01, 0x3f];
    this.commands.frameRate_10fps = [0x02, 0x00];
    this.commands.frameRate_1fps = [0x02, 0x01];
    this.commands.int_disable = [0x03, 0x00];
    this.commands.int_absVal = [0x03, 0x03];
    this.commands.int_diff = [0x03, 0x01];
    this.commands.stat = [0x04];
    this.commands.statClr_ovs = [0x05, 0x04];
    this.commands.statClr_int = [0x05, 0x02];
    this.commands.average_disable = [0x07, 0x00];
    this.commands.average_enable = [0x07, 0x10];
  }

  static info() {
    return {
      name: 'AMG8833',
    };
  }

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

    this.address = 0x69;
    if (this.params.address === 0x69) {
      this.address = 0x69;
    } else if (this.params.addressmode === 0x68) {
      this.address = 0x68;
    } else if (this.params.address !== undefined) {
      throw new Error('address must be 0x68 or 0x69');
    }

    this.params.clock = this.params.clock || 400 * 1000; //for i2c
    this.params.mode = this.params.mode || 'master'; //for i2c
    this.params.pull = this.params.pull || null; //for i2c
    this.i2c = obniz.getI2CWithConfig(this.params);
    this.obniz.wait(50);

    obniz.i2c0.write(this.address, this.commands.mode_normal);
    obniz.i2c0.write(this.address, this.commands.reset_flag);
    obniz.i2c0.write(this.address, this.commands.frameRate_10fps);
    obniz.i2c0.write(this.address, this.commands.int_disable);
  }

  async getOnePixWait(pixel) {
    let pixelAddrL = 0x80;
    let pixelAddrH = 0x81;
    if (pixel >= 0 && pixel <= 63) {
      pixelAddrL = 0x80 + pixel * 2;
      pixelAddrH = 0x81 + pixel * 2;
    } else {
      throw new Error('pixel number must be range of 0 to 63');
    }
    this.i2c.write(this.address, [pixelAddrL]);
    let dataL = await this.i2c.readWait(this.address, 1);
    this.i2c.write(this.address, [pixelAddrH]);
    let dataH = await this.i2c.readWait(this.address, 1);
    let temp12bit = (dataH << 8) | dataL;
    if (dataH & 0x08) {
      // negative temperature
      temp12bit = temp12bit - 1;
      temp12bit = 0xfff - temp12bit; // bit inverting
      return temp12bit * -0.25;
    } else {
      // positive temperature
      return temp12bit * 0.25;
    }
  }

  async getAllPixWait() {
    let tempArray = new Array(64);
    this.i2c.write(this.address, [0x80]);
    const datas = await this.i2c.readWait(this.address, 64 * 2);

    for (let i = 0; i < 64; i++) {
      let temp12bit = (datas[i * 2 + 1] << 8) | datas[i * 2];
      let temp = 0;
      if (datas[i * 2 + 1] & 0x08) {
        // negative temperature
        temp12bit = temp12bit - 1;
        temp12bit = 0xfff - temp12bit; // bit inverting
        temp = temp12bit * -0.25;
      } else {
        // positive temperature
        temp = temp12bit * 0.25;
      }
      tempArray[i] = temp;
    }

    return tempArray;
  }
}

if (typeof module === 'object') {
  module.exports = AMG8833;
}