Glasgow Embedded / Glasgow - History

applet.audio.yamaha_opl: flush command stream each 20 ms.

Otherwise, the playback coroutine is starving the record coroutine.
This doesn't seem entirely reliable--other options?

applet.audio.yamaha_opl: disable recording after playback is done.

This was formerly hacked off because of the issues with pipelining
(most likely the start command arriving at an inappropriate time,
but possibly something else), and it is no longer necessary after
commit e59730fb.

access.direct.demultiplexer: pipeline reads and writes.

This significantly improves throughput (up to ~21 MB/s) without any
particular action on behalf of applets.

Hinting is now obsolete. Two applets used hinting:
* memory-floppy: hinting is removed (untested);
* audio-yamaha-opl: hinting and custom pipelining are removed.

The audio-yamaha-opl applet requires explicit flushes now, since
otherwise the playback coroutine will not yield nearly often enough.

The `benchmark loopback` mode also now works, since it was hanging
not because of the arbiter (the arbiter will not, in fact, cause
starvation) but because of a deadlock between read and write
coroutines inherent in the old demultiplexer implementation.

Fixes #73.

device.hardware: only cancel submitted transfers.

Before this commit, cancelling the future after the transfer has
already finished would result in a LIBUSB_ERROR_NOT_FOUND exception
raised in the done callback.

applet.internal.benchmark: make sequence generation much faster.

Also, make the -c argument take a byte count, not an element count;
element count doesn't make any sense in this context.

applet.internal.benchmark: fix throughput for loopback mode.

Loopback mode transfers everything twice, so it's double the value
currently shown.

Also, show values in Mbps as well.

revC1: add inline resistors to AUX/SYNC, add testpoints to rear

cli: suggest valid revisions if --rev fails parsing.