X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fscripting.txt;fp=src%2Fscripting.txt;h=0000000000000000000000000000000000000000;hp=cc8f59713cc42cd28461ad10b576df95787d45f3;hb=2cca6fcb8b8d58c27ad8517952f5c24c70801e2a;hpb=64faff8f9ca599d00807d2df59e8852aaf687fbe

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-Plan for hosted scripting support in OpenOCD
-============================================
-
-What scripting will not do
-==========================
-It is not the intention that normal OpenOCD users will
-use tcl scripting extensively, write lots of clever scripts,
-or contribute back to OpenOCD. 
-
-The scripting support is intended for developers of 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.
-
-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 <productionfile> <serialnumber>. 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.
-  
-  
-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! :-)