diff options
| author | Patrick Stewart <patstew@gmail.com> | 2014-08-27 17:17:27 +0100 |
|---|---|---|
| committer | Paul Fertser <fercerpav@gmail.com> | 2018-01-13 11:37:13 +0000 |
| commit | 1003bc7be7c471d28794280be69632c5f074789f (patch) | |
| tree | d0a1fcb0e107eceda5fdbb77d420d30d95705550 /src | |
| parent | ab25205bbfaa73b33d3510086c44cfe06c1ca006 (diff) | |
ftdi swd: disable SWD output pin during input
* Disables the data output pin while SWD is reading, so that a simple FTDI
SWD interface can be made by connecting TCK to SWD_CLK and TDI+TDO directly
to SWDIO. Enabled by setting SWDIO_OE to 0.
Change-Id: I7d3b71cf3f4eea163cb320aff69ed95d219190bd
Signed-off-by: Patrick Stewart <patstew@gmail.com>
Signed-off-by: Roger Lendenmann <roger.lendenmann@intel.com>
Reviewed-on: http://openocd.zylin.com/2274
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins
Diffstat (limited to 'src')
| -rw-r--r-- | src/jtag/drivers/ftdi.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c index 32876bac..e69707e5 100644 --- a/src/jtag/drivers/ftdi.c +++ b/src/jtag/drivers/ftdi.c @@ -1064,8 +1064,19 @@ static int ftdi_swd_init(void) static void ftdi_swd_swdio_en(bool enable) { struct signal *oe = find_signal_by_name("SWDIO_OE"); - if (oe) - ftdi_set_signal(oe, enable ? '1' : '0'); + if (oe) { + if (oe->data_mask) + ftdi_set_signal(oe, enable ? '1' : '0'); + else { + /* Sets TDI/DO pin (pin 2) to input during rx when both pins are connected + to SWDIO */ + if (enable) + direction |= jtag_direction_init & 0x0002U; + else + direction &= ~0x0002U; + mpsse_set_data_bits_low_byte(mpsse_ctx, output & 0xff, direction & 0xff); + } + } } /** |