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Diffstat (limited to 'doc/openocd.texi')
| -rw-r--r-- | doc/openocd.texi | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index a65244a6..8ee328bd 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -2462,6 +2462,7 @@ No arguments: print status. @end deffn @section Transport Configuration +@cindex Transport As noted earlier, depending on the version of OpenOCD you use, and the debug adapter you are using, several transports may be available to @@ -2479,6 +2480,7 @@ No arguments: returns name of session's selected transport. @end deffn @subsection JTAG Transport +@cindex JTAG JTAG is the original transport supported by OpenOCD, and most of the OpenOCD commands support it. JTAG transports expose a chain of one or more Test Access Points (TAPs), @@ -2486,13 +2488,28 @@ each of which must be explicitly declared. JTAG supports both debugging and boundary scan testing. Flash programming support is built on top of debug support. @subsection SWD Transport +@cindex SWD +@cindex Serial Wire Debug SWD (Serial Wire Debug) is an ARM-specific transport which exposes one Debug Access Point (DAP, which must be explicitly declared. (SWD uses fewer signal wires than JTAG.) SWD is debug-oriented, and does not support boundary scan testing. Flash programming support is built on top of debug support. (Some processors support both JTAG and SWD.) +@deffn Command {swd newdap} ... +Declares a single DAP which uses SWD transport. +Parameters are currently the same as "jtag newtap" but this is +expected to change. +@end deffn +@deffn Command {swd wcr trn prescale} +Updates TRN (turnaraound delay) and prescaling.fields of the +Wire Control Register (WCR). +No parameters: displays current settings. +@end deffn + @subsection SPI Transport +@cindex SPI +@cindex Serial Peripheral Interface The Serial Peripheral Interface (SPI) is a general purpose transport which uses four wire signaling. Some processors use it as part of a solution for flash programming. |