A simple USB-JTAG interface implemented using LUFA library running AT90USB162 based on Open Hardware board opendous. Primary reason is to create a cheap replacement for the parallel port JTAG adapter "Wiggler" and alike.

Connecting pins to JTAG interface

PORTB is used for JTAG communications, with following pins configuration:

|Pin|Function| |:--|:-------| |0 |TDI | |1 |TMS | |2 |TRST | |3 |SRST | |4 |TCK | |5 |TDO |

Various JTAG cable pin outs are available here: http://www.jtagtest.com/pinouts/

Configuring openocd

get the patched openocd-0.4.0: wget http://opendous-jtag.googlecode.com/files/openocd-0.4.0.opendous.estick.tar.bz2 tar jxf openocd-0.4.0.opendous.estick.tar.bz2

Run the ./configure --enable-opendous or ./configure --enable-estick it is synonym cd openocd-0.4.0.opendous.estick ./configure --prefix=/opt/arm --enable-opendous make make install

make sure that PATH includes /opt/arm/bin directory, run openocd: openocd -f interface/opendous -f target/<your cpu target>

Testing flash write speed using LM3S2965

Test of loading a eLua project ( http://www.eluaproject.net/en_downloads.html#binaries ) on a Stellaris LM3S2965 demo kit, opendous-jtag was running on ATMEGA32U4 mcu, but using only 360 bytes memory buffer (similar to AT90USB162 setting)

```

openocd -f interface/opendous.cfg -f target/lm3s6965.cfg Open On-Chip Debugger 0.4.0 (2010-04-19-22:29) Licensed under GNU GPL v2 For bug reports, read http://openocd.berlios.de/doc/doxygen/bugs.html 500 kHz jtag_nsrst_delay: 100 jtag_ntrst_delay: 100 srst_only separate srst_gates_jtag srst_open_drain Info : eStick JTAG Interface ready Info : clock speed 500 kHz Info : JTAG tap: lm3s6965.cpu tap/device found: 0x3ba00477 (mfg: 0x23b, part: 0xba00, ver: 0x3) Info : lm3s6965.cpu: hardware has 6 breakpoints, 4 watchpoints Now running command through telnet telnete localhost 4444

halt target state: halted target halted due to debug-request, current mode: Handler PendSV xPSR: 0x6100000e pc: 0x0000b1ac msp: 0x20008390

stellaris mass_erase 0 stellaris mass erase complete

flash write_image elua0.7_lua_lm3s6965.bin 0 bin not enough working area available(requested 8192, free 8152) wrote 226136 bytes from file /home/vfonov/downloads/elua0.7_lua_lm3s6965.bin in 22.894466s (9.646 kb/s)

reset JTAG tap: lm3s6965.cpu tap/device found: 0x3ba00477 (mfg: 0x23b, part: 0xba00, ver: 0x3) shutdown shutdown command invoked ```

Then trying to see if eLua is working: ``` $ picocom /dev/ttyUSB0 -b 115200 picocom v1.4

port is : /dev/ttyUSB0 flowcontrol : none baudrate is : 115200 parity is : none databits are : 8 escape is : C-a noinit is : no noreset is : no nolock is : no send_cmd is : ascii_xfr -s -v -l10 receive_cmd is : rz -vv

Terminal ready

eLua# help Shell commands: exit - exit from this shell help - print this help ls or dir - lists ROMFS files and sizes cat or type - lists file contents lua [args] - run Lua with the given arguments recv - receive a file (XMODEM) and execute it ver - print eLua version eLua# ver eLua version 0.7 For more information go to http://www.eluaproject.net eLua# lua /rom/info.lua Press CTRL+Z to exit Lua I'm running on platform LM3S The CPU is a LM3S6965 The board name is EK-LM3S6965 ```

Testing memory write speed on Samsung s3c2440 on FriendlyARM board

Following http://labs.kernelconcepts.de/Publications/Micro2440/

openocd -f interface/opendous.cfg -f target/samsung_s3c2440.cfg Open On-Chip Debugger 0.4.0 (2010-04-19-22:29) Licensed under GNU GPL v2 For bug reports, read http://openocd.berlios.de/doc/doxygen/bugs.html trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain Info : eStick JTAG Interface ready Error: usb_bulk_read failed (requested=1, result=-110) Error: Estick command 0x06 failed (-1) Info : RCLK (adaptive clock speed) Info : JTAG tap: s3c2440.cpu tap/device found: 0x0032409d (mfg: 0x04e, part: 0x0324, ver: 0x0) Info : Embedded ICE version 2 Info : s3c2440.cpu: hardware has 2 breakpoint/watchpoint units Info : accepting 'telnet' connection from 0 Info : JTAG tap: s3c2440.cpu tap/device found: 0x0032409d (mfg: 0x04e, part: 0x0324, ver: 0x0) Warn : NOTE! DCC downloads have not been enabled, defaulting to slow memory writes. Type 'help dcc'. Warn : NOTE! Severe performance degradation without fast memory access enabled. Type 'help fast'. Now running command through telnet ``` $ telnet localhost 4444

reset JTAG tap: s3c2440.cpu tap/device found: 0x0032409d (mfg: 0x04e, part: 0x0324, ver: 0x0) NOTE! DCC downloads have not been enabled, defaulting to slow memory writes. Type 'help dcc'. NOTE! Severe performance degradation without fast memory access enabled. Type 'help fast'. reset halt JTAG tap: s3c2440.cpu tap/device found: 0x0032409d (mfg: 0x04e, part: 0x0324, ver: 0x0) target state: halted target halted in ARM state due to debug-request, current mode: Supervisor cpsr: 0x600000d3 pc: 0x00000000 MMU: disabled, D-Cache: disabled, I-Cache: disabled NOTE! DCC downloads have not been enabled, defaulting to slow memory writes. Type 'help dcc'. NOTE! Severe performance degradation without fast memory access enabled. Type 'help fast'. bp 0x33f80000 4 hw breakpoint set at 0x33f80000 resume target state: halted target halted in ARM state due to breakpoint, current mode: Supervisor cpsr: 0x400000d3 pc: 0x00000000 MMU: disabled, D-Cache: disabled, I-Cache: disabled load_image /opt/FriendlyARM/friendlyarm2440-package/u-boot.bin 0x33f80000 239016 bytes written at address 0x33f80000 downloaded 239016 bytes in 36.938187s (6.319 kb/s) resume Now switching to serial console: $ picocom /dev/ttyS0 -b 115200 U-Boot 1.3.2-dirty-moko12 (Apr 16 2009 - 18:14:52)

I2C: ready DRAM: 64 MB Flash: 2 MB NAND: Bad block table not found for chip 0 Bad block table not found for chip 0 128 MiB * Warning - bad CRC or NAND, using default environment

USB: S3C2410 USB Deviced In: serial Out: serial Err: serial MAC: 08:08:11:18:12:27 Hit any key to stop autoboot: 0

MINI2440 # ```