gistfile1.txt

let Max2719SPI = {
  _create: ffi("void *mgos_max7219_create(void *, int)"),
  _set_devices: ffi("bool mgos_max7219_set_num_devices(void *, int)"),
  _set_mode: ffi("bool mgos_max7219_set_mode(void *, bool)"),
  _write_digit: ffi("bool mgos_max7219_write_digit(void *, int, int, int)"),

  create: function(spi) {
    let obj = Object.create(Max2719SPI._proto);
    obj.driver = Max2719SPI._create(spi.spi);
    return driver;
  },
  _proto: {
    setDevices: function(number) {
      return Max2719SPI._set_devices(this.driver, number);
    },
    setMode: function(isRaw) {
      return Max2719SPI._set_mode(this.driver, !isRaw);
    },
    writeDigit: function(digit, value, device) {
      if (!device) {
        device = 0;
      }
      return Max2719SPI._write_digit(this.driver, device, digit, value);
    }
  }
};