cordova_digicdc.js

var cdc_device = function(){


  this.ready = false;
  this.error = false;

  // init device
  this.init = function( callback ){
    digicdc.register(
      (function success(){
        console.log("device is ready");
        this.ready = true;
        if (callback) callback(msg);
      }).bind(this),
      (function error(){
        this.error = true;
      }).bind(this)
    );
  };

  // read and call callback
  var cb_read = function(cb) {
    digicdc.read(
      // success
      function(t){
        cb(t);
      },
      // error
      function(e) {
        cb("");
      }
    );
  };

  // write and call callback
  var cb_write = function(data, cb){
    digicdc.write(
      data,
      function(){
        cb();
      },
      function(){
        cb();
      }
    );
  };

  // public available read
  this.read = function(callback){
    cb_read(
      function(){
        if (callback) callback();
      }
    );
  };

  // public available write
  this.write = function(data, callback){
    cb_write(
      data,
      function(){
        if (callback) callback();
      }
    );
  };

  // read device multiple times
  var read_multiple = function( callback_end, delay, repetitions ){
    var res = "";
    var curr_read = 0;
    read_multiple_cb( callback_end, delay, repetitions, curr_read, res );
  };

  // callback for multiread
  var read_multiple_cb = function(callback_end, delay, repetitions, curr_read, res){
    if (repetitions == curr_read){
      callback_end(res);
      return;
    }
    else {
      cb_read(
        function(r){
          //console.log("read step, count="+curr_read+" data="+r);
          res = res + r;
          curr_read++;
          setTimeout(
            function(){
              read_multiple_cb( callback_end, delay, repetitions, curr_read, res );
            },
            delay
          );
        }
      );
    }
  };

  // write cmd to device and read output
  this.cmd = function(cmd, callback, read_repetitions, read_delay){
    if (read_repetitions) var num_reads = read_repetitions;
    else var num_reads = 4;
    if (read_delay) var delay = read_delay;
    else var delay = 5;
    cb_write(
      cmd,
      function(){
        read_multiple(
          function(data){
            if (callback){
              var u8arr = new Uint8Array(data.length);
              for (i in data){
                u8arr[i] = data.charCodeAt(i);
              }
              callback(u8arr);
            }
          },
          delay,
          num_reads
        );
      }
    );
  };

  return this;
}