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This probably wouldn't actually cause a problem, but it seems more
reliable to wait for a packet interrupt before re-reading the packet
OUT len register. This could avoid spinning while waiting for a USB
packet, which seems like a good thing.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This splits the packet code into master/slave halves and hooks the
slave side up to the getchar/putchar/flush logic in ao_stdio.c
Signed-off-by: Keith Packard <keithp@keithp.com>
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__reentrant causes the compiler to place args and locals on the stack
instead of in the data segment.
Signed-off-by: Keith Packard <keithp@keithp.com>
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USB bulk transfers are a sequence of maximum-sized packets followed by
a short packet, which signals the end of the transfer. When the last
packet of the transfer would be a full-sized packet, an additional
packet of zero length is sent to signal the transfer end.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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