audio underrun check?

[SanZamoyski]

Hi!

I'm working on project with BLE. I have some problems with underrun (sometimes sound gets coppy - i do not know how to explain it better). I'm already on custom board and I't inconvinient to connect to serial, so I try to debug everything via BLE.
Can I ask audio to tell me if underrun occured (i.e. loop was too long)?

Best regards!

[schreibfaul1]

This is difficult, there is nothing to recognise empty DMA. If you have a sample rate of 44.1KHz and the DMA memory has a size of 8KBytes then you can bridge 0.05s in the best case (4Bytes per sample * 41KHz results in about 160K samples/s) audio.loop() should therefore be called more than 20 times per second, in practice about 30 ... 100 times per second.

[SanZamoyski]

I'll try to work with that info.

Thanks!

[SanZamoyski]

I'm getting about 4k (and 300-400 with web serwer on), so this is not software problem (I believe).
Best regards!