USB JTAG adapter for OpenOCD (ARM Debugger)
von Benedikt Sauter, sauter@ixbat.de, 2007
With the USB JTAG adapter you are able to program many ARM-based microcontrollers in-circuit. The adapter allows realtime debugging, the setting of breakpoints and the realization of single steps, so you get the whole range of functions needed for successful application development and for efficient debugging. You can control the adapter with OpenOCD by Dominic Rath. NEW: In the meantime, OpenOCD along with USBprog-support is integrated in the testing sector of Debian Sarge. Meaning, everything you need can easily be installed with the package management.
This adapter isn't the fastest, but the speed is enough for the most simple programmings and debugsessions! A singlestep on the telnet console works almost without any delay. Nevertheless, I am working on a small PCB that can easily be plugged on just like the breadboard shown above. There will be an CPLD on it that will advance the communication drastically.
State Testet with the telnet interface and the console GDB under Linux and Windows.
Download
Support for OpenOCD
On this page, only the support directly for the adapter is provided. If you have any problem with OpenOCD and an ARM controller you are in good hands in the OpenOCD support forum: http://forum.sparkfun.com/viewforum.php?f=18
Pin configuration 10-pole plug
| | Description | Pin | Pin | Description | TDI *
| 1 | 2
| VREF | | SRST | 3 | 4 | TRST | TMS *
| 5 | 6 | | TCK *
| 7 | 8 | | TDO *
| 9 | 10 | GND | * only these IOs are available in version 2.0
|
JP3 (on 3.0) JP2 (on 2.0)
| | Pin | Description | | 1 | VCC (not existing on JP2 in version 2.0)
| | 2 | SRST
| | 3 | TRST | | 4 | GND (not existing on JP2 in version 2.0) |
ATTENTION! There are ARM processors that aren't 5V compatible! (e.g. STR710, STR711, STR712) You have to hook up a circuit for the level conversion! Quote from a user: Please note: Atmel SAM7XC data sheet, page 13: JTAG Port Pins are not 5V tolerant, although the rest is! OpenOCD under Linux Debian (Sarge testing)
- apt-get install openocd
Install from the source code - Download source code archive with subversion:
svn checkout http://svn.berlios.de/svnroot/repos/openocd/trunk - Prepare compilation: ./configure --enable-usbprog
- Compilation: make
- Installing the file system: make install
- Modulate permits : chmod +s /usr/local/bin/openocd (as root)
USBprog and OpenOCD in action: ARM Getting Started with USBprog and OpenOCD
OpenOCD under Windows Michale Fischer is maintaining an installation version of OpenOCD. It is available on the homepage http://www.yagarto.de/. Since USBprog is quite new, there is only a Yagarto OpenOCD USBprog version on my page for now. The file simply has to be downloaded and installed. You can either run OpenOCD from the Dos box or integrate it in an development environment consisting of Eclipse.
Working with the OpenOCD Debugger GNU/Linux
Quite a while ago I wrote a small demo here. It should last for a manual. Developing LPC2103(ARM7) with OpenOCD under Linux
Windows
Since I'm more familiar with Linux I refer directly to the page of Michael Fischer. Here is described how to develop with OpenOCD and the GCC under Windows: http://www.yagarto.de/howto.html Level converter 5V and 3,3 V Possible voltage converters: SN74LVC8T245
8-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and Three-State Outputs 1.65 5.5 Both 8 Dual Supply
TXB0108
8-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing and +/-15-kV ESD Protect 1.2 | 
