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| author | Antonio Borneo <borneo.antonio@gmail.com> | 2020-03-05 17:00:50 +0100 |
|---|---|---|
| committer | Antonio Borneo <borneo.antonio@gmail.com> | 2021-01-18 15:32:21 +0000 |
| commit | 0b248e04c1e58b374e82bad0361e42a5e8a96b77 (patch) | |
| tree | bf22a6531e4387e09616429450cd5757eea61f02 | |
| parent | 2dc9c1df81b6458875233fc3710ab9d3e871743d (diff) | |
| download | riscv-openocd-0b248e04c1e58b374e82bad0361e42a5e8a96b77.zip riscv-openocd-0b248e04c1e58b374e82bad0361e42a5e8a96b77.tar.gz riscv-openocd-0b248e04c1e58b374e82bad0361e42a5e8a96b77.tar.bz2 | |
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
| -rw-r--r-- | src/jtag/drivers/ftdi.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c index 9d1c85c..9e47d3c 100644 --- a/src/jtag/drivers/ftdi.c +++ b/src/jtag/drivers/ftdi.c @@ -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) { |