As it turned out OpenOCD-USB Adapter does not have EEPROM which is on the adapter schematic (see the bottom of this page). The EEPROM chip (93LC46BT SOT-23-6) was removed from the board after manufacturing. It is clearly can be seen on the picture (6 pads on the right of USB connector). I guess, the EEPROM chip was removed because of an error on the adapter PCB (EEPROM's CLK and Vcc pins are swapped). The same adapter is also available form www.ic-board.de. So be aware of this defect.
3 comments:
What version of the OpenOCD-USB board do you have?
I've got a "625000043A", which does have the EEPROM fitted, but which currently does not enumerate on any machine I have connected it to. The only schematic I have seen is for 61000043A :-(
What version of the OpenOCD-USB board do you have?
The number on the back of PCB is 625000043A.
As I mentioned in another post the device is functional. I am using the adapter with my Mac to upload a firmware and debug code on LPC2103 and LPC2148.
Thanks for the info.
I got my board from www.embedded-projects.net , and it did have the EEPROM fitted. However, it would not connect to my Mac or Linux machines.
The PCB is the same number as yours, and I confirmed it has the same layout error (swapped clk and vcc).
When I removed the EEPROM, the board is now detected by the USB subsystem under Linux and MacOS.
I'm currently trying to connect from a Debian linux machine to an LM3S6965 evaluation board. Once it is working, I'll be trying other CortexM devices, and trying with MacOSX.
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