Arduino delayMicroseconds equivalent

I've been "porting" an Arduino code example and been successfully converting it so far (not much to change other than removing the datatypes) and the code uses delayMicroseconds. Is there a similar way to achieve this in Espruino?

The code is basically:

method() {
  digitalWrite(pin, 1);
  delayMicroseconds(350);
  digitalWrite(pin, 0);
  delayMicroseconds(350);
}

At the moment there isn't a direct replacement. You can do:

digitalWrite(pin, 1);
setTimeout(function() {
  digitalWrite(pin, 0);
  setTimeout(function() {
   ...
  }, 0.35);
},0.35);

or you can do:

digitalPulse(pin,1,0.35); 

Which will be substantially more accurate. This actually starts executing subsequent commands (apart from other digitalPulses) before the pulse has ended, so for something more accurate, you could try:

digitalPulse(pin,1,0.35); 
digitalPulse(pin,0,0.35); 

I'm trying to discourage people from writing code that delays (because then they start to get annoyed that Espruino isn't multithreaded), however I think delays do need to be added for this kind of thing - I've put a bug in for it, so hopefully I'll get around to it at some point.

Awesome! Worked like a charm! Thank you!

Now I can toggle an RF-controlled light switch using my HY board and Espruino \o/

Great! Could you post up some details about it? I'd love to get a list of 'stuff you can do' going :)

Sure. A tiny disclaimer though, I don't know anything about this, I'm learning about microcontrollers as I go ;) Therefore, I might use the wrong terminology :)

My board is the HYSTM32 3.2". It's currently running the 1v41 of Espruino (if that matters).
I have two separate modules for RF signals, one receiver and one transmitter. Sorry for these links leading to a swedish shop, they can probably be found in other online stores as well (probably cheaper too).

Any way.

I soldered some headers onto my board so that I easily can connect and disconnect stuff while learning about these things. I tried connecting the modules using a breadboard, but the antenna pin seems to act up when doing so. So I just use male-female connector wires from the transmitter into the board. Connected ground and power (3v3) and the data pin to A2.

I had found examples online to receive and transmit rf signals, but they were either for arduino or for raspberry pi. I ended up using the rc-switch library as a base.

The example TypeA_WithDIPSwitches_Lightweight seemed to be the easiest way to start. My cheap RF-plugs is using this setup, 5dip on the remote and 2x5 dip on the plug. This example is more or less directly translatable into Espruino. Though I tweaked it a little bit:

var thePin = A2;

function send(numberHigh, numberLow) {
  digitalPulse(thePin, 1, 0.35 * numberHigh);
  digitalPulse(thePin, 0, 0.35 * numberLow);
}

function sendCode(code) {
  for (repeat=0; repeat < 6; repeat++) {
    for (i=4; i < 16; i++) {
      send(1, 3);
      if (((code << (i-4)) & 2048) > 0) {
        send(1, 3);
      } else {
        send(3, 1);
      }
    }
    send(1,31);
  }
}

function on() {
  sendCode(0b101010100010);
}

function off() {
  sendCode(0b101010100001);
} 

As my plugs and remote is set with the following system code:

1   2    3   4    5
on  off  on  off  on

and the plug in the above code has the following dips set:

a    b    c    d    e
off  on   off  off  off

I therefore use the code 1010101000 and append 10 for turning on and 01 for turning off.

Theres a pretty good explanation on the rc-switch wikipages for how these plugs operate.

My next goal is to port the receiving code so that my rf-receiver can react to the remote that comes along with the plugs.

Hi,

Thanks, this is awesome! So you can now control all your plugs from the touchscreen?

I actually bought a 433Mhz TX/RX pair a few days ago because I wanted to be able to read my heating oil level, but this is really neat. Do you have a link to the plugs/remote that you used?

The receiving code might be a bit tricky - I'm not sure, but when I looked at the signal from my receiver there was a huge amount of data being sent (maybe it's where I live). I think it's possible that the amount of data (4,000 pulses/sec non-stop) might be too much for Espruino at the moment :(

In theory, yes! I bought them at a cheap store here in Sweden quite some time ago so do't have a link for them, sorry. They are just some "noname" super cheap versions.

I noticed the spam in the receiver as well, haven't gotten that far yet though, got stuck experimenting with a gui on the touchscreen :)