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driver/ftdi: skip trst in swd mode 

When using the adapter olimex arm-jtag-swd (to convert to SWD a
JTAG-only FTDI adapter), the pin trst on JTAG side is re-used to
control the direction of pin SWDIO on SWD side.
There is a single reset API at adapter driver to assert/deassert
either srst and/or trst. A request to assert/deassert srst can
cause also trst to change value, hanging the SWD communication.

In SWD mode, ignore the value passed to trst.

Change-Id: I5fe1eed851177d405d77ae6079da9642dc1a08f1
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6006
Tested-by: jenkins
This commit is contained in:
Antonio Borneo 2020-03-05 17:00:50 +01:00
parent 2dc9c1df81
commit 0b248e04c1
1 changed files with 13 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/jtag/drivers/ftdi.c
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@ -524,17 +524,19 @@ static int ftdi_reset(int trst, int srst)
LOG_DEBUG_IO("reset trst: %i srst %i", trst, srst);
if (trst == 1) {
if (sig_ntrst)
ftdi_set_signal(sig_ntrst, '0');
else
LOG_ERROR("Can't assert TRST: nTRST signal is not defined");
} else if (sig_ntrst && jtag_get_reset_config() & RESET_HAS_TRST &&
trst == 0) {
if (jtag_get_reset_config() & RESET_TRST_OPEN_DRAIN)
ftdi_set_signal(sig_ntrst, 'z');
else
ftdi_set_signal(sig_ntrst, '1');
if (!swd_mode) {
if (trst == 1) {
if (sig_ntrst)
ftdi_set_signal(sig_ntrst, '0');
else
LOG_ERROR("Can't assert TRST: nTRST signal is not defined");
} else if (sig_ntrst && jtag_get_reset_config() & RESET_HAS_TRST &&
trst == 0) {
if (jtag_get_reset_config() & RESET_TRST_OPEN_DRAIN)
ftdi_set_signal(sig_ntrst, 'z');
else
ftdi_set_signal(sig_ntrst, '1');
}
}
if (srst == 1) {