Timeout of less than 10ms in setInterval seems to hang

[grgustaf]

Clock ticks on Arduino 101 default to 100 per second, I believe, or 10ms intervals. So this is probably related to that and the fact that we currently sleep for a tick in our main loop.

@jprestwo, you might be interested to look into this.

[grgustaf]

I assume this problem is easily reproducible, but if not, I'm running into it on a Love-o-Meter.js sample that I'll check in shortly.

[jprestwo]

I am not seeing this problem when I tested it (Love-o-Meter.js is not checked in yet). I ran the following code:

var i = 0;
setInterval(function() {
    print("test: " + i++);
}, 1);

Maybe the print is causing enough delay to throw it off? @grgustaf were you just blinking an LED maybe?

[haoxli]

@jprestwo If you add more code in setInterval(), it will be reproduced.
I think this issue occur by the execution time of code block is larger than the timeout, the next loop of setInterval() will hang because the previous one have not finished.

[grgustaf]

Works for me, with timeout of 1, 0.5, 0.1, and even 0. (Not sure if it really pays attention to sub-1ms timeouts.)