tree 98aa11ff12be1c2dc721115c06584ea11c5ddee9
parent 383b7fe197a781792d4eb42abe1e84551c2b5d0b
author Nico Huber <nico.h@gmx.de> 1676160347 +0100
committer Nico Huber <nico.h@gmx.de> 1709981441 +0000

serprog: Refine flushing before synchronization

We used to wait for 1s before flushing buffers of the tty layer.
However, if the programmer had more data to send than would fit
into these buffers, it would continue to send after flushing the
latter. So we try to read all the data instead. The added loop
reads up to 512KiB and stops when no data is received for 10ms.
Overall, it should time out after at most 10s.

Tests show that an stm32-vserprog can be re-synchronized after
interrupted reads, where the old implementation failed. In case
synchronization is necessary, it also succeeds without notice-
able delay.

Change-Id: Iaa5dfceac0629381ca0924bb59b988525bacba3f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/72996
Reviewed-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>