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doc: mention SWD multidrop 

Change-Id: I361dc351c407b67613eadef4d29e27ed0e00bd05
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/6744
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
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Tomas Vanek 2021-11-23 13:17:47 +01:00 committed by Antonio Borneo
parent 57d9fd9bbc
commit af723387be
1 changed files with 12 additions and 0 deletions
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doc/openocd.texi
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@ -3433,6 +3433,17 @@ Parameters are currently the same as "jtag newtap" but this is
expected to change. expected to change.
@end deffn @end deffn
@cindex SWD multi-drop
The newer SWD devices (SW-DP v2 or SWJ-DP v2) support the multi-drop extension
of SWD protocol: two or more devices can be connected to one SWD adapter.
SWD transport works in multi-drop mode if @ref{dap_create,DAP} is configured
with both @code{-dp-id} and @code{-instance-id} parameters regardless how many
DAPs are created.
Not all adapters and adapter drivers support SWD multi-drop. Only the following
adapter drivers are SWD multi-drop capable:
cmsis_dap (use an adapter with CMSIS-DAP version 2.0), ftdi, all bitbang based.
@subsection SPI Transport @subsection SPI Transport
@cindex SPI @cindex SPI
@cindex Serial Peripheral Interface @cindex Serial Peripheral Interface
@ -4346,6 +4357,7 @@ instead of "@option{-chain-position} @var{dotted.name}" when the target is creat
The @command{dap} command group supports the following sub-commands: The @command{dap} command group supports the following sub-commands:
@anchor{dap_create}
@deffn {Command} {dap create} dap_name @option{-chain-position} dotted.name configparams... @deffn {Command} {dap create} dap_name @option{-chain-position} dotted.name configparams...
Declare a DAP instance named @var{dap_name} linked to the JTAG tap Declare a DAP instance named @var{dap_name} linked to the JTAG tap
@var{dotted.name}. This also creates a new command (@command{dap_name}) @var{dotted.name}. This also creates a new command (@command{dap_name})