New Espruino IDE

I've just pushed out a new IDE (0.68.5) - across Chrome, Native, Website and NPM.

There are a few nice improvements:

• There's a new intro screen which looks a bit better, and which will show you up to date news.
  
• If a device is running new firmware (cutting edge, or 1v96 when released) then it'll report back which modules are included in it - and these will be used when figuring out which new modules to get off the internet.
  
• The longstanding issue with Blockly blocks being misshapen on first startup is now fixed, and you can choose which blocks are shown in settings with a nicer UI.
  
• The Assembler now supports templated strings, so you can do one big multiline blob of assembly
  
• The Assembler itself supports a few more operations and has one or two ops fixed
  
• The compiler service for compiled functions has had a whole bunch of improvements, and is now available for Nordic devices (like Puck.js) with 1v96 (or cutting edge) firmware as well - just right now not through the website-based IDE until the compiler service gets upgraded to HTTPS.
  
  

Leaving the best till last:

You can now dynamically add C functions into Espruino, as part of JS code

As a totally random example, here's a function to calculate Fibonacci numbers, written in C, JavaScript, and compiled JavaScript:

var c = E.compiledC(`
// int fibo(int)

int fibo(int n){
 if(n <= 1){
  return n;
 }
 int fibo = 1;
 int fiboPrev = 1;
 for(int i = 2; i < n; ++i){
  int temp = fibo;
  fibo += fiboPrev;
  fiboPrev = temp;
 }
 return fibo;
}
`);


function fibo(n){
 if(n <= 1){
  return n;
 }
 var fibo = 1;
 var fiboPrev = 1;
 for(var i = 2; i < n; ++i){
  var temp = fibo;
  fibo += fiboPrev;
  fiboPrev = temp;
 }
 return fibo;
}

function compiled_fibo(n){
  "compiled";
 if(n <= 1){
  return n;
 }
 var fibo = 1;
 var fiboPrev = 1;
 for(var i = 2; i < n; ++i){
  var temp = fibo;
  fibo += fiboPrev;
  fiboPrev = temp;
 }
 return fibo;
}

This is still extremely early days, so expect some things not to work. However importantly you can upload multiple C functions that can interact... You just put the prototype (as used for the Assembler) for each function you want to export at the top:

var c = E.compiledC(`
// void press(bool)
// int get()

int data;

void press(bool state){
  data++;
}

int get() {
 int r = data;
 data = 0;
 return r;
}
`);

setWatch(c.press, BTN1, {repeat:true, edge:"both", irq:true});

setInterval(function() {
  print(c.get());
}, 10000);

In the example above, a C function is called from an interrupt when a pin changes state (so runs very quickly), and it then changes a variable which can then be read back with normal JavaScript.

You can even access data stored in flat strings:

var c = E.compiledC(`
// int sum(int, int)

int sum(int len, unsigned char *data){
  int s = 0;
  while (len--)
    s += *(data++);
  return s;
}
`);


var str  = E.toString("\1\2\3\4\5\6"); // create a flat string
print(c.sum(str.length, E.getAddressOf(str,true)));

Hope you have fun with this! It could potentially be used to create modules for all kind of things - for example MP3 decoders, realtime audio effects, or accessing on-chip peripherals that aren't exposed in Espruino normally.

Neat! Best of both worlds! ...and answer to some performance challenges.

Oh shit, that's something I didn't see coming! Inline motherfucking c!

It's been possible for a while but I never enabled it because there didn't seem to be a nice way of mixing C with JS - but templated strings are perfect as backtick and dollar aren't part of the C language, so you can just paste code in verbatim - you just have to be a bit careful about using them in strings.

Very nice and usefull.
New post opend in main forum.

Post above was moved.

IF ANYONE HAS TROUBLE WITH THIS, PLEASE POST IN THE MAIN FORUM - I'd prefer this news thread didn't turn into a massive troubleshooting thread :)

I'm using Raspberry Pi and EspruinoHub to connect to Puck, if I understand it correctly I should update EspruinoHub to get the new IDE on my browser (Chrome). What's the safest way to do that without breaking anything? Thanks.

Yes - if you followed the GitHub instructions to install then on the Pi you want:

cd EspruinoHub
git pull
cd EspruinoWebIDE
git pull
cd EspruinoTools
git pull

Then restart and you're sorted!