diff options
author | David Brownell <dbrownell@users.sourceforge.net> | 2010-02-27 00:12:38 -0800 |
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committer | David Brownell <dbrownell@users.sourceforge.net> | 2010-02-27 00:12:38 -0800 |
commit | a3245bd7cdd2d8c3740c5e8f31efcd78de67837a (patch) | |
tree | 37448ab9163c86ea221c821b956be11ebd06ebe8 /src/jtag/zy1000/zy1000.c | |
parent | 4a64820f230a267b1f2e36d4be567074e5b8cb76 (diff) |
interface: define TMS sequence command
For support of SWD we need to be able to clock out special bit
sequences over TMS or SWDIO. Create this as a generic operation,
not yet called by anything, which is split as usual into:
- upper level abstraction ... here, jtag_add_tms_seq();
- midlayer implementation logic hooking that to the lowlevel code;
- lowlevel minidriver operation ... here, interface_add_tms_seq();
- message type for request queue, here JTAG_TMS.
This is done slightly differently than other operations: there's a flag
saying whether the interface driver supports this request. (In fact a
flag *word* so upper layers can learn about other capabilities too ...
for example, supporting SWD operations.)
That approach (flag) lets this method *eventually* be used to eliminate
pathmove() and statemove() support from most adapter drivers, by moving
all that logic into the mid-layer and increasing uniformity between the
various drivers. (Which will in turn reduce subtle bugginess.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Diffstat (limited to 'src/jtag/zy1000/zy1000.c')
-rw-r--r-- | src/jtag/zy1000/zy1000.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/jtag/zy1000/zy1000.c b/src/jtag/zy1000/zy1000.c index d920c30b..e21104c7 100644 --- a/src/jtag/zy1000/zy1000.c +++ b/src/jtag/zy1000/zy1000.c @@ -804,7 +804,16 @@ int interface_jtag_add_pathmove(int num_states, const tap_state_t *path) return ERROR_OK; } - +int interface_add_tms_seq(unsigned num_bits, const uint8_t *seq) +{ + /* FIXME just implement this, like pathmove but without + * JTAG-specific state transition checking. Then update + * zy1000_interface to report that it's supported. + * + * Eventually interface_jtag_add_pathmove() could vanish. + */ + return ERROR_JTAG_NOT_IMPLEMENTED; +} void embeddedice_write_dcc(struct jtag_tap *tap, int reg_addr, uint8_t *buffer, int little, int count) { |