run JavaScript code from SD Card

[espruino-discuss]

Posted at 2015-06-01 by Jorgen

Him,
is it possible to load script files from SD card and execute the code/functions in the current environment?

This would be really helpfull to add additional effect code via WiFi and store it for later use on SD card ;)

[gfwilliams]

Posted at 2015-06-01 by @gfwilliams

Yes, I think it's as easy as eval(require("fs").readFileSync()) - eval should use the current scope.

Maybe a 'nicer' way of doing it is:

var myEffect = new Function("any","args","callback",require("fs").readFileSync());
// file might contain: "console.log(any, args); callback();"
myEffect("Hello","World", function() { 
 ...
});

So then you pass in what you want as arguments, and you load the code in as a function - so it's easy to just delete that function later if you want to free the memory.

... maybe wait for 1v80 before you try writing to the SD card though - @jumjum discovered a bug in 1v73 - 1v79 that could corrupt SD card contents.

[espruino-discuss]

Posted at 2015-06-02 by Jorgen

@gordon you are the man! Thx for the fast reply and the awesome short snippet.
Really good idea to put content to function and execute them directly.
Do you have any hints for me, when the 1v80 will release? Or did the bugfix already exsists on GitHub?

Before I implement this stuff, I have to wait for the ESP12 board from OSHPark and try out the WiFi communication. Next step is to add small library to stream JavaScript content to Pico. Last step is to store this content (effect functions) to SD for later use...

[gfwilliams]

Posted at 2015-06-02 by @gfwilliams

Sounds great!

You can pick up one of the GitHub builds from here

Choose the right binary from the page above, and copy/paste the link into the flasher page in the IDE. That should have the SD card fix...

[espruino-discuss]

Posted at 2015-06-02 by Jorgen

I just try to flash this one:
http://www.espruino.com/binaries/git/commits/a11edb58f9300cf95742ac0611cbabe9ad67ed4c/espruino_1v80_pico_1r3_wiznet.bin
everything worked on flashing progress.
But now my demo-code brings some errors:

function flash_led1(led_on) {
  digitalWrite(LED1, led_on);
}
function pulse_led2() {
  digitalPulse(LED2, 1, 150);
}
// when button is pressed
setWatch(function(e) {
  console.log("Press at "+e.time);
  digitalWrite(LED2, 0);
  flash_led1(1); 
}, BTN, {repeat: true, edge: "rising", debounce: 50});
// when button is pressed
setWatch(function(e) {
  console.log("Release at "+e.time);
  flash_led1(0);
  pulse_led2(); 
}, BTN, {repeat: true, edge: "falling", debounce: 50});

Errors:

Press at
Uncaught Error: Field or method "time" does not already exist, and can't create it on undefined
 at line 2 col 28
  console.log("Press at "+e.time);
                            ^
in function called from system
Release at
Uncaught Error: Field or method "time" does not already exist, and can't create it on undefined
 at line 2 col 30
  console.log("Release at "+e.time);
                              ^
in function called from system

[espruino-discuss]

Posted at 2015-06-02 by DrAzzy

This is a bug with debounce.

See: espruino/Espruino#537

[espruino-discuss]

Posted at 2015-06-03 by Jorgen

thx @drazzy. I can modify the demo code to call getTime() instead...

[gfwilliams]

Posted at 2015-06-03 by @gfwilliams

Yes, sorry - I'll try and get that fixed for the next release.

[gfwilliams]

Posted at 2015-06-03 by @gfwilliams

Fixed now, it'll be in the 1v80 release. Available from www.espruino.com/binaries/git/commits/03bc4de4ed9fee0a7863c0e55040ad79f2a2fa35 in a few minutes

[espruino-discuss]

Posted at 2015-06-03 by Jorgen

@gordon you are Mr.FixitFast ;)
I'll try this later - I'm currently at work...