this fixes an issue reported on MatekH743, but also applies to other
boards. When not using DMA if there have been bytes written before the
auto flow control detection was enabled then these must be cleared
from _total_written so the flow control detection can work correctly
This reverts commit 5de6c690d8.
That commit broke the build for the affected board as the chibios
headers rely on the name of the file matching a ifdef
this fixes an issue found by Andy Piper where the H743 bootloader gets
a hard fault in the DCache enable code when SRAM1 is primary memory.
This is the simplest fix I could think of, and avoids the problem by
making DTCM the first segment in the bootloader.
Note that we can't use DTCM as first segment for main firmware since
we went to double precision EKF as the static variables don't fit
this changes the heuristics for UART TX DMA allocation to greatly
reduce the chances of DMA contention causing long delays on other
devices
This fixes issues with FETTec driver output and gimbal status messages
as reported by Amilcar and OlliW. The problem is particularly bad when
no GPS is connected to GPS1 on fmuv3 and derived boards (such as
CubeBlack)
key changes:
- remember the contention_counter across begin() calls, as the GPS
calls begin with new baudrates regularly
- added a is_shared() API to Shared_DMA, allowing the UART driver to
avoid TX DMA on shared streams when at low baudrates.
this avoids an issue with the ChibiOS 20.3 virtual timer
implementation that can result in a scheduling slip equal to the
system timer period.
Andy has been suggesting this change for a while. I resisted it as I
thought it would impact on soft-serial parsing, but it turns out it
doesn't.
Fixes issue #18383
Hwurzburg
Iampete1
Andrew Tridgell
mateksys
Andy Piper
bugobliterator
Marek Łukasiewicz
Peter Barker
Randy Mackay
Dr.-Ing. Amilcar do Carmo Lucas