Avoid long time execution when sending midiusb packet

[YruamaLairba]

trafficstars

I just discovered that sometimes, sending a midiusb packet take more than 250ms. Typically this happen when the Arduino is connected to the computer, but no app to get the midi data. Is there a simple way to avoid or reduce this delay from the arduino side ?

[facchinm]

Hi @YruamaLairba , probably what you are seeing is the USB_send timeout if the interface is not yet configured. Do you also experience the long delay if you open the serial port?

[YruamaLairba]

Yes, the long delay is here when the serial port is open. This how i report the 250ms delay. The USB_send timeout seems a good way, can you tell me more about it or indicate some documentation ?

[franky47]

Related to #46.

[DisasterAreaDesigns]

Edit - I was having this issue, mostly due to my use of an outdated core for production devices. I backported the timeout counter from usb.send() from the current core and I'm no longer experiencing this issue.

[DanielRudrich]

There's an easy way to check, if the port is ready. See my reply here: https://github.com/arduino-libraries/MIDIUSB/issues/46