There are several things you should keep in mind when choosing a dongle.
-@enumerate
+@enumerate
@item @b{Voltage} What voltage is your target - 1.8, 2.8, 3.3, or 5V?
Does your dongle support it? You might need a level converter.
@item @b{Pinout} What pinout does your target board use?
wires, or an "octopus" connector, to convert pinouts.
@item @b{Connection} Does your computer have the USB, printer, or
Ethernet port needed?
-@item @b{RTCK} Do you require RTCK? Also known as ``adaptive clocking''
+@item @b{RTCK} Do you require RTCK? Also known as ``adaptive clocking''
@end enumerate
@section Stand alone Systems
@item @b{USBprog}
@* Link: @url{http://www.embedded-projects.net/usbprog} - which uses an Atmel MEGA32 and a UBN9604
-@item @b{USB - Presto}
+@item @b{USB - Presto}
@* Link: @url{http://tools.asix.net/prg_presto.htm}
@item @b{Versaloon-Link}
@option{srst_gates_jtag} indicates that asserting SRST gates the
JTAG clock. This means that no communication can happen on JTAG
-while SRST is asserted.
+while SRST is asserted.
The optional @var{trst_type} and @var{srst_type} parameters allow the
driver mode of each reset line to be specified. These values only affect
The target specific "dangerous" optimisation tweaking options may come and go
as more robust and user friendly ways are found to ensure maximum throughput
-and robustness with a minimum of configuration.
+and robustness with a minimum of configuration.
Typically the "fast enable" is specified first on the command line:
@deffn Command {armv4_5 reg}
Display a table of all banked core registers, fetching the current value from every
core mode if necessary. OpenOCD versions before rev. 60 didn't fetch the current
-register value.
+register value.
@end deffn
@subsection ARM7 and ARM9 specific commands
@deffn Command {arm7_9 dbgrq} (@option{enable}|@option{disable})
Control use of the EmbeddedIce DBGRQ signal to force entry into debug mode,
instead of breakpoints. This should be
-safe for all but ARM7TDMI--S cores (like Philips LPC).
+safe for all but ARM7TDMI--S cores (like Philips LPC).
This feature is enabled by default on most ARM9 cores,
including ARM9TDMI, ARM920T, and ARM926EJ-S.
@end deffn
Enable or disable memory writes and reads that don't check completion of
the operation. This provides a huge speed increase, especially with USB JTAG
cables (FT2232), but might be unsafe if used with targets running at very low
-speeds, like the 32kHz startup clock of an AT91RM9200.
+speeds, like the 32kHz startup clock of an AT91RM9200.
@end deffn
@deffn {Debug Command} {arm7_9 write_core_reg} num mode word
gdb_memory_map disable
@end example
For this to function correctly a valid flash configuration must also be set
-in OpenOCD. For faster performance you should also configure a valid
+in OpenOCD. For faster performance you should also configure a valid
working area.
Informing GDB of the memory map of the target will enable GDB to protect any
information as an argument to each proc.
There are three main types of return values: single value, name value
-pair list and lists.
+pair list and lists.
Name value pair. The proc 'foo' below returns a name/value pair
-list.
+list.
@verbatim
puts "Name: $name, Value: $value"
}
@end verbatim
-
+
Lists returned must be relatively small. Otherwise a range
should be passed in to the proc in question.
variables. JimTCL, as implemented in OpenOCD creates $HostOS which
holds one of the following values:
-@itemize @bullet
+@itemize @bullet
@item @b{winxx} Built using Microsoft Visual Studio
@item @b{linux} Linux is the underlying operating sytem
@item @b{darwin} Darwin (mac-os) is the underlying operating sytem.
that ``deep sleeps'' at 32kHz between every keystroke. It can be
painful.
-@b{Solution #1 - A special circuit}
+@b{Solution #1 - A special circuit}
In order to make use of this, your JTAG dongle must support the RTCK
feature. Not all dongles support this - keep reading!
@item @b{Win32 Pathnames} Why don't backslashes work in Windows paths?
OpenOCD uses Tcl and a backslash is an escape char. Use @{ and @}
-around Windows filenames.
+around Windows filenames.
@example
> echo \a
@item @b{Data Aborts} When debugging with OpenOCD and GDB (plain GDB, Insight, or Eclipse),
I get lots of "Error: arm7_9_common.c:1771 arm7_9_read_memory():
-memory read caused data abort".
+memory read caused data abort".
The errors are non-fatal, and are the result of GDB trying to trace stack frames
beyond the last valid frame. It might be possible to prevent this by setting up
@b{Also note:} If you have a multi-threaded operating system, they
often do not @b{in the intrest of saving memory} waste these few
-bytes. Painful...
+bytes. Painful...
@item @b{JTAG Reset Config} I get the following message in the OpenOCD console (or log file):
@node Tcl Crash Course
@chapter Tcl Crash Course
-@cindex Tcl
+@cindex Tcl
Not everyone knows Tcl - this is not intended to be a replacement for
learning Tcl, the intent of this chapter is to give you some idea of
Commands are executed like this:
-@enumerate
+@enumerate
@item Parse the next line into (argc) and (argv[]).
@item Look up (argv[0]) in a table and call its function.
@item Repeat until End Of File.
@enumerate
@item The SET command creates 2 variables, X and Y.
@item The double [nested] EXPR command performs math
-@* The EXPR command produces numerical result as a string.
+@* The EXPR command produces numerical result as a string.
@* Refer to Rule #1
@item The format command is executed, producing a single string
@* Refer to Rule #1.
#4 DANGER DANGER DANGER
$_TARGETNAME configure -event foo "puts \"Time: [date]\""
@end example
-@enumerate
+@enumerate
@item The $_TARGETNAME is an OpenOCD variable convention.
@*@b{$_TARGETNAME} represents the last target created, the value changes
each time a new target is created. Remember the parsing rules. When
OpenOCD comes with a target configuration script library. These scripts can be
used as-is or serve as a starting point.
-The target library is published together with the OpenOCD executable and
+The target library is published together with the OpenOCD executable and
the path to the target library is in the OpenOCD script search path.
-Similarly there are example scripts for configuring the JTAG interface.
+Similarly there are example scripts for configuring the JTAG interface.
The command line below uses the example parport configuration script
that ship with OpenOCD, then configures the str710.cfg target and
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