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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/jtag.h | |
parent | 4a64820f230a267b1f2e36d4be567074e5b8cb76 (diff) | |
download | riscv-openocd-a3245bd7cdd2d8c3740c5e8f31efcd78de67837a.zip riscv-openocd-a3245bd7cdd2d8c3740c5e8f31efcd78de67837a.tar.gz riscv-openocd-a3245bd7cdd2d8c3740c5e8f31efcd78de67837a.tar.bz2 |
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/jtag.h')
-rw-r--r-- | src/jtag/jtag.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index 0555754..7e5dc10 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -575,6 +575,8 @@ tap_state_t jtag_get_end_state(void); void jtag_add_sleep(uint32_t us); +int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state t); + /** * Function jtag_add_clocks * first checks that the state in which the clocks are to be issued is @@ -693,7 +695,7 @@ int jtag_error_clear(void); /** * Return true if it's safe for a background polling task to access the * JTAG scan chain. Polling may be explicitly disallowed, and is also - * unsafe while nTRST is active or the JTAG clock is gated off., + * unsafe while nTRST is active or the JTAG clock is gated off. */ bool is_jtag_poll_safe(void); |