From 2cca6fcb8b8d58c27ad8517952f5c24c70801e2a Mon Sep 17 00:00:00 2001 From: zwelch Date: Wed, 20 May 2009 08:16:50 +0000 Subject: Move scripting overview from source tree to doxygen manual. git-svn-id: svn://svn.berlios.de/openocd/trunk@1852 b42882b7-edfa-0310-969c-e2dbd0fdcd60 --- doc/manual/scripting.txt | 80 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 doc/manual/scripting.txt (limited to 'doc') diff --git a/doc/manual/scripting.txt b/doc/manual/scripting.txt new file mode 100644 index 00000000..e62cba6d --- /dev/null +++ b/doc/manual/scripting.txt @@ -0,0 +1,80 @@ +/** @page scripting OpenOCD Scripting Overview + +@section What scripting will not do + +The scripting support is intended for developers of OpenOCD. +It is not the intention that normal OpenOCD users will +use tcl scripting extensively, write lots of clever scripts, +or contribute back to OpenOCD. + +Target scripts can contain new procedures that end users may +tinker to their needs without really understanding tcl. + +Since end users are not expected to mess with the scripting +language, the choice of language is not terribly important +to those same end users. + +Jim Tcl was chosen as it was easy to integrate, works +great in an embedded environment and Øyvind Harboe +had experience with it. + +@section Uses of scripting + +Default implementation of procedures in tcl/procedures.tcl. + +- Polymorphic commands for target scripts. + - there will be added some commands in Tcl that the target + scripts can replace. + - produce . Default implementation + is to ignore serial number and write a raw binary file + to beginning of first flash. Target script can dictate + file format and structure of serialnumber. Tcl allows + an argument to consist of e.g. a list so the structure of + the serial number is not limited to a single string. + - reset handling. Precise control of how srst, trst & + tms is handled. +- replace some parts of the current command line handler. + This is only to simplify the implementation of OpenOCD + and will have no externally visible consequences. + Tcl has an advantage in that it's syntax is backwards + compatible with the current OpenOCD syntax. +- external scripting. Low level tcl functions will be defined + that return machine readable output. These low level tcl + functions constitute the tcl api. flash_banks is such + a low level tcl proc. "flash banks" is an example of + a command that has human readable output. The human + readable output is expected to change inbetween versions + of OpenOCD. The output from flash_banks may not be + in the preferred form for the client. The client then + has two choices a) parse the output from flash_banks + or b) write a small piece of tcl to output the + flash_banks output to a more suitable form. The latter may + be simpler. + + +@section External scripting + +The embedded Jim Tcl interpreter in OpenOCD is very limited +compared to any full scale PC hosted scripting language. + +The goal is to keep the internal Jim Tcl interpreter as +small as possible and allow any advanced scripting, +especially scripting that interacts with the host, +run on the host and talk to OpenOCD via the TCP/IP +scripting connection. + +Another problem with Jim Tcl is that there is no debugger +for it. + +With a bit of trickery it should be possible to run Jim +Tcl scripts under a Tcl interpreter on a PC. The advantage +would be that the Jim Tcl scripts could be debugged using +a standard PC Tcl debugger. + +The rough idea is to write an unknown proc that sends +unknown commands to OpenOCD. + +Basically a PC version of startup.tcl. Patches most +gratefully accepted! :-) + + */ -- cgit v1.2.3