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ftdi: Added a method to read the signal values

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Change-Id: Ie32a372bbc57249b4802d900234a0e8e7d1d1830
Signed-off-by: Stephen Tridgell <stephen.tridgell@exablaze.com>
Reviewed-on: http://openocd.zylin.com/2556
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins
This commit is contained in:
Stephen Tridgell
2015-02-25 19:18:27 +11:00
committed by Andreas Fritiofson
parent e3ccae3ed7
commit 2cc1c6daf2
2 changed files with 82 additions and 4 deletions
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13
doc/openocd.texi
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@@ -2515,7 +2515,8 @@ The driver uses a signal abstraction to enable Tcl configuration files to
define outputs for one or several FTDI GPIO. These outputs can then be
controlled using the @command{ftdi_set_signal} command. Special signal names
are reserved for nTRST, nSRST and LED (for blink) so that they, if defined,
will be used for their customary purpose.
will be used for their customary purpose. Inputs can be read using the
@command{ftdi_get_signal} command.
Depending on the type of buffer attached to the FTDI GPIO, the outputs have to
be controlled differently. In order to support tristateable signals such as
@@ -2582,7 +2583,7 @@ minimal impact on the target system. Avoid floating inputs, conflicting outputs
and initially asserted reset signals.
@end deffn
@deffn {Config Command} {ftdi_layout_signal} name [@option{-data}|@option{-ndata} data_mask] [@option{-oe}|@option{-noe} oe_mask] [@option{-alias}|@option{-nalias} name]
@deffn {Config Command} {ftdi_layout_signal} name [@option{-data}|@option{-ndata} data_mask] [@option{-input}|@option{-ninput} input_mask] [@option{-oe}|@option{-noe} oe_mask] [@option{-alias}|@option{-nalias} name]
Creates a signal with the specified @var{name}, controlled by one or more FTDI
GPIO pins via a range of possible buffer connections. The masks are FTDI GPIO
register bitmasks to tell the driver the connection and type of the output
@@ -2590,7 +2591,9 @@ buffer driving the respective signal. @var{data_mask} is the bitmask for the
pin(s) connected to the data input of the output buffer. @option{-ndata} is
used with inverting data inputs and @option{-data} with non-inverting inputs.
The @option{-oe} (or @option{-noe}) option tells where the output-enable (or
not-output-enable) input to the output buffer is connected.
not-output-enable) input to the output buffer is connected. The options
@option{-input} and @option{-ninput} specify the bitmask for pins to be read
with the method @command{ftdi_get_signal}.
Both @var{data_mask} and @var{oe_mask} need not be specified. For example, a
simple open-collector transistor driver would be specified with @option{-oe}
@@ -2620,6 +2623,10 @@ Set a previously defined signal to the specified level.
@end itemize
@end deffn
@deffn {Command} {ftdi_get_signal} name
Get the value of a previously defined signal.
@end deffn
@deffn {Command} {ftdi_tdo_sample_edge} @option{rising}|@option{falling}
Configure TCK edge at which the adapter samples the value of the TDO signal