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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
Download Patch File Download Diff File Expand all files Collapse all files

31
src/jtag/drivers/remote_bitbang.c
View File

@@ -3,6 +3,8 @@
/***************************************************************************
* Copyright (C) 2011 by Richard Uhler *
* ruhler@mit.edu *
* *
* Copyright (C) 2021 by Manuel Wick <manuel@matronix.de> *
***************************************************************************/
#ifdef HAVE_CONFIG_H
@@ -220,11 +222,35 @@ static int remote_bitbang_blink(int on)
return remote_bitbang_queue(c, FLUSH_SEND_BUF);
}
static void remote_bitbang_swdio_drive(bool is_output)
{
char c = is_output ? 'O' : 'o';
if (remote_bitbang_queue(c, FLUSH_SEND_BUF) == ERROR_FAIL)
LOG_ERROR("Error setting direction for swdio");
}
static int remote_bitbang_swdio_read(void)
{
if (remote_bitbang_queue('c', FLUSH_SEND_BUF) != ERROR_FAIL)
return remote_bitbang_read_sample();
else
return BB_ERROR;
}
static int remote_bitbang_swd_write(int swclk, int swdio)
{
char c = 'd' + ((swclk ? 0x2 : 0x0) | (swdio ? 0x1 : 0x0));
return remote_bitbang_queue(c, NO_FLUSH);
}
static struct bitbang_interface remote_bitbang_bitbang = {
.buf_size = sizeof(remote_bitbang_recv_buf) - 1,
.sample = &remote_bitbang_sample,
.read_sample = &remote_bitbang_read_sample,
.write = &remote_bitbang_write,
.swdio_read = &remote_bitbang_swdio_read,
.swdio_drive = &remote_bitbang_swdio_drive,
.swd_write = &remote_bitbang_swd_write,
.blink = &remote_bitbang_blink,
};
@@ -349,6 +375,8 @@ COMMAND_HANDLER(remote_bitbang_handle_remote_bitbang_host_command)
return ERROR_COMMAND_SYNTAX_ERROR;
}
static const char * const remote_bitbang_transports[] = { "jtag", "swd", NULL };
static const struct command_registration remote_bitbang_subcommand_handlers[] = {
{
.name = "port",
@@ -401,7 +429,7 @@ static struct jtag_interface remote_bitbang_interface = {
struct adapter_driver remote_bitbang_adapter_driver = {
.name = "remote_bitbang",
.transports = jtag_only,
.transports = remote_bitbang_transports,
.commands = remote_bitbang_command_handlers,
.init = &remote_bitbang_init,
@@ -409,4 +437,5 @@ struct adapter_driver remote_bitbang_adapter_driver = {
.reset = &remote_bitbang_reset,
.jtag_ops = &remote_bitbang_interface,
.swd_ops = &bitbang_swd,
};