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adapter: Add support for 'exit state' of GPIO signal

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In addition to a signal's 'init state', add support to configure its
'exit state'. This option determines the state and configuration of a
pin when the adapter terminates its operation.

Change-Id: I0577ed9e3bc79715290b4e6a21e3f64c66f2ff9a
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9087
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Marc Schink
2025-06-15 10:52:49 +00:00
committed by Antonio Borneo
parent fcff4b712c
commit d02389bbfa
3 changed files with 77 additions and 18 deletions
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14
doc/openocd.texi
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@@ -2447,6 +2447,7 @@ dict get [adapter list] ftdi
@option{-push-pull} | @option{-open-drain} | @option{-open-source} | @
@option{-pull-none} | @option{-pull-up} | @option{-pull-down} | @
@option{-init-inactive} | @option{-init-active} | @option{-init-input} @
@option{-exit-inactive} | @option{-exit-active} | @option{-exit-input} | @option{-exit-no-change} @
] ]}
Define the GPIO mapping that the adapter will use. The following signals can be
@@ -2481,11 +2482,14 @@ equivalent to issuing the single command @command{gpio led 7 -chip 1
signals which are inputs. The drive mode for the srst and trst signals must be
set with the @command{adapter reset_config} command. It is not permissible to
set the initial state of swdio_dir as it is derived from the initial state of
swdio. The command @command{adapter gpio} prints the current configuration for
all GPIOs while the command @command{adapter gpio gpio_name} prints the current
configuration for gpio_name. Not all adapters support this generic GPIO mapping,
some require their own commands to define the GPIOs used. Adapters that support
the generic mapping may not support all of the listed options.
swdio. Accordingly, the final state before the adapter terminates its operation,
so-called “exit state”, can be set. By default the state and configuration of an
output pin is not changed when the driver terminates its operation. The
command @command{adapter gpio} prints the current configuration for all GPIOs
while the command @command{adapter gpio gpio_name} prints the current configuration
for gpio_name. Not all adapters support this generic GPIO mapping, some require
their own commands to define the GPIOs used. Adapters that support the generic
mapping may not support all of the listed options.
@end deffn
@deffn {Command} {adapter name}