Redirecting the USB port for use by a program

Loopback2.js 22 Aug 2016
Used the Loopback devices to allow the USB port to act as program input.
Commands sent to the USB port trigger sub commands that get sent to the Espruino console.
0: Exit,
1: LEDon
2: LEDoff
The left pane of the WebIde or a terminal program connected to the USB port can be used to send the commands.

//Loopback2.js
//22 Aug 2016

//use the left pane of the WebIde or
//use putty or other termial program on com assigned to USB
//use webide to load and run the program
//disconnect webide
//start putty on com port at 115200,8 no flow control
//typing in putty should appear followed by connect in putty screen


var Sp1=USB;
var Sp2=LoopbackA;


Sp1.setup(115200);
Sp2.setup(115200);
LoopbackB.setup(115200);
LoopbackB.setConsole();

Sp1.print("Enter 1 to turn the LED on:\n\r");
Sp1.print("Enter 2 to turn the LED off:\n\r");
Sp1.print("Enter 0 to Exit:\n\r");


Sp1.on('data', function (data) {
  Sp1.print(data+"\n\r"); 
  switch(data){
    case "1"://LED on
     Sp2.print("digitalWrite(B12,1);\n\r");
     Sp1.print("digitalWrite(B12,1);\n\r");
    break;
    case "2"://LED off
     Sp2.print("digitalWrite(B12,0);\n\r");
     Sp1.print("digitalWrite(B12,0);\n\r");
    break;
    case"0"://Exit
     Sp2.print("reset();\n\r");
     Sp2.print("USB.setConsole();\n\r");
     Sp1.print("USB.setConsole();\n\r");
  }//end switch
});

The output:

>echo(0);
Enter 1 to turn the LED on:
Enter 2 to turn the LED off:
Enter 0 to Exit:
echo(1)
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
1
digitalWrite(B12,1);
2
digitalWrite(B12,0);
0
USB.setConsole();

1 Attachment

• loopback2.js