How to deal with midi notes accumulated in the transmission buffer

[piwicode]

When a midi device is mounted (tud_midi_mounted() == true) but the events are not consumed by the host (no aseqdump -p 20:0 or equivalent running), it looks like midi events sent with tud_midi_packet_write accumulates in a buffer.

When the host finally starts to consume event, all the notes are received at the same time which can be an issue for a instrument.

What is the standard way to deal with that?

Is there a way to detect that the host is not consuming events earlier than observing the buffer is full with tud_midi_packet_write return value?

Is there a way to clear the buffer when it is clogged for a while?

[hathach]

we can add midi write_flush() similar to cdc.

[piwicode]

Thank you for the prompt answer.

It is not clear to me from the documentation if tud_cdc_n_write_flush drop the content of the buffer if the transmission to the host fails.

[hathach]

written data is accumulated until ep mps is reached (64/512 bytes). flush() force tinyusb to send it out immediately. If it is mounted(), typically transfer would succeeded and PC will buffered data even though it isn't used yet. In short, flush() will allow application to manage how much data in the buffer.