Debugging sampler issues

Device Code
#1

It seems that on some of our imps a sampler we had running is no longer running. Do they eventually time out? Any suggestions on how to debug this issue when it’s intermittent.

Thanks

#2

Here is the code I’m using if that helps.

`
class SampleManager {
static SAMPLE_HZ = 50;

_buffer = blob(100);

constructor() {
    hardware.sampler.configure(hardware.pinH, SAMPLE_HZ, [_buffer], function(buffer, length){ _processSamples(buffer, length); }.bindenv(this));
    hardware.sampler.start();
}

function _processSamples(buffer, length) {
    if (length > 0) {
        for (local i = 0; i < SAMPLE_HZ; ++i) {
            local sample = buffer.readn('s');
        }
    }
}

}
`

#3

You only have a single buffer queued, which means if your callback takes longer than 1/50th of a second to run, you’ll overrun.

It’s worth printing the buffer length in your callback (especially if it’s not full) - if there’s an overrun then you’ll see that here.

#4

Thanks. So if an over-run occurs do you need to stop and start the sampler?

#5

I’m pretty sure that’s what happens.