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remote_bitbang: Add SWD support

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This adds new command characters to make SWD work with the new split
jtag and swd operations of bitbang.

The command characters are as follows:
    O - SWDIO drive 1
    o - SWDIO drive 0
    c - SWDIO read request
    d - SWD write 0 0
    e - SWD write 0 1
    f - SWD write 1 0
    g - SWD write 1 1

Documentation has been updated accordingly. The new commands will be
used by an adapted version of the jtag-openocd applet of the "Glasgow
Debug Tool" (https://github.com/glasgowEmbedded/Glasgow). It has been
tested against an stm32f103 and an at91samd21 target.

contrib/remote/bitbang/remote_bitbang_sysfsgpio.c has also been adapted
to support SWD via the new command set. Some limited testing has been
done using a Raspberry Pi 2 with an stm32f103 and an at91samd21 target
attached.

Change-Id: I8e998a2cb36905142cb16e534483094cd99e8fa7
Signed-off-by: Manuel Wick <manuel@matronix.de>
Signed-off-by: David Ryskalczyk <david.rysk@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6044
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Manuel Wick
2021-01-30 22:46:50 +01:00
committed by Tomas Vanek
parent 119a533862
commit 0f70c6c325
5 changed files with 230 additions and 60 deletions
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6
doc/openocd.texi
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@@ -2810,9 +2810,9 @@ If not specified, default 0xFFFF is used.
@end deffn
@deffn {Interface Driver} {remote_bitbang}
Drive JTAG from a remote process. This sets up a UNIX or TCP socket connection
with a remote process and sends ASCII encoded bitbang requests to that process
instead of directly driving JTAG.
Drive JTAG and SWD from a remote process. This sets up a UNIX or TCP socket
connection with a remote process and sends ASCII encoded bitbang requests to
that process instead of directly driving JTAG and SWD.
The remote_bitbang driver is useful for debugging software running on
processors which are being simulated.