diff options
Diffstat (limited to 'doc/manual/primer/tcl.txt')
| -rw-r--r-- | doc/manual/primer/tcl.txt | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/doc/manual/primer/tcl.txt b/doc/manual/primer/tcl.txt index c10c364..9be4a05 100644 --- a/doc/manual/primer/tcl.txt +++ b/doc/manual/primer/tcl.txt @@ -115,7 +115,7 @@ Exception: The arrays. set x "2 * 6" set foo([expr $x]) "twelve" - + ************************************************** *************************************************** === TCL TOUR === @@ -133,7 +133,7 @@ This means it is evaluated when the file is parsed. In TCL, "FOR" is a funny thing, it is not what you think it is. Syntactically - FOR is a just a command, it is not language -construct like for(;;) in C... +construct like for(;;) in C... The "for" command takes 4 parameters. (1) The "initial command" to execute. @@ -215,7 +215,7 @@ All memory regions must have 2 things: (2) NAME( array ) And the array must have some specific names: ( <idx>, THING ) - Where: THING is one of: + Where: THING is one of: CHIPSELECT BASE LEN @@ -224,7 +224,7 @@ All memory regions must have 2 things: RWX - the access ability. WIDTH - the accessible width. - ie: Some regions of memory are not 'word' + ie: Some regions of memory are not 'word' accessible. The function "address_info" - given an address should @@ -237,14 +237,14 @@ tell you about the address. MAJOR FUNCTION: == -proc memread32 { ADDR } -proc memread16 { ADDR } -proc memread8 { ADDR } +proc memread32 { ADDR } +proc memread16 { ADDR } +proc memread8 { ADDR } All read memory - and return the contents. [ FIXME: 7/5/2008 - I need to create "memwrite" functions] - + ************************************************** *************************************************** === TCL TOUR === @@ -265,13 +265,13 @@ In a makefile or shell script you may have seen this: FOO_linux = "Penguins rule" FOO_winXP = "Broken Glass" FOO_mac = "I like cat names" - + # Pick one BUILD = linux #BUILD = winXP #BUILD = mac FOO = ${FOO_${BUILD}} - + The "double [set] square bracket" thing is the TCL way, nothing more. ---- @@ -290,7 +290,7 @@ Notice this IF COMMAND - (not statement) is like this: The "IF" command expects either 2 params, or 4 params. === Sidebar: About "commands" === - + Take a look at the internals of "jim.c" Look for the function: Jim_IfCoreCommand() And all those other "CoreCommands" @@ -298,10 +298,10 @@ The "IF" command expects either 2 params, or 4 params. You'll notice - they all have "argc" and "argv" Yea, the entire thing is done that way. - + IF is a command. SO is "FOR" and "WHILE" and "DO" and the others. That is why I keep using the phase it is a "command" - + === END: Sidebar: About "commands" === Parameter 1 to the IF command is expected to be an expression. @@ -315,7 +315,7 @@ CATCH - is an error catcher. You give CATCH 1 or 2 parameters. The first 1st parameter is the "code to execute" The 2nd (optional) is where to put the error message. - + CATCH returns 0 on success, 1 for failure. The "![catch command]" is self explaintory. @@ -325,7 +325,7 @@ above, the IF command can take many parameters they just have to be joined by exactly the words "else" or "elseif". The 4th parameter contains: - + "error [format STRING....]" This lets me modify the previous lower level error by tacking more @@ -346,7 +346,7 @@ string, then using "dlopen()" and "dlsym()" to look it up - and get a function pointer - and calling the function pointer. In this case - I execute a dynamic command. You can do some cool -tricks with interpretors. +tricks with interpretors. ---------- @@ -380,7 +380,7 @@ Some assumptions: The "CHIP" file has defined some variables in a proper form. -ie: AT91C_BASE_US0 - for usart0, +ie: AT91C_BASE_US0 - for usart0, AT91C_BASE_US1 - for usart1 ... And so on ... @@ -419,9 +419,9 @@ with the generated list of commands for the entire USART. With that little bit of code - I now have a bunch of functions like: show_US0, show_US1, show_US2, .... etc ... - + And show_US0_MR, show_US0_IMR ... etc... - + And - I have this for every USART... without having to create tons of boiler plate yucky code. |