Delay in imp

Squirrel Code
1

Hello I’m trying to do a delay to generate code of an IR control in a function with imp.sleep() but I need that the delay are the most exactly possible and when I use imp.sleep(.009) for example, the real result is 1.5 ms or imp.sleep(.000560) the result is .000984 seg, and the control doesn´t work. So my question is if exist some way to improve the precision or if exist another way to do a delay with more exactly this problem

thanks!! :slight_smile:

2

Can you show us (or describe) the wave form you’re trying to create?

You might be able to this with PWM or SPI?

EDIT: I’m actually writing some code that might be applicable, and if I know what you’re trying to do I can probably give a better example :slight_smile:

3

Sounds like something that may be possible with some clever use of the FixedFrequencyDAC Class?

4

I’m trying to reproduce the code of a IR control in my case I use a NEC protocol this is my code

function Start(){
hardware.pin9.write(0.25);
imp.sleep(0.009);
hardware.pin9.write(0.0);
imp.sleep(0.0045);
}

function Uno(){
hardware.pin9.write(0.25);
imp.sleep(0.000560);
hardware.pin9.write(0.0);
imp.sleep(0.00169);
}

function Cero(){
hardware.pin9.write(0.25);
imp.sleep(0.000560);
hardware.pin9.write(0.0);
imp.sleep(0.000560);
}

but the times in imp.sleep() are higher and causes that the control doesn’t work
thank you for your previous answers

5

As squirrel is an interpreted language, this isn’t going to work; you can’t hold timings that tight. I’d suggest you build your waveform as a bitstream, and use SPI to clock it out of a MOSI pin at a suitable rate; you can then hold much better timings.

Either that, or use the fixedfrequencydac to do a similar job.