Analog Devices ADuC7026 (ARM) Prototype Board, USB, JTAG Reviews
Product: Analog Devices ADuC7026 (ARM) Prototype Board, USB, JTAG
From: Leonard McGuire
Date: Sunday 30 September, 2007
I think that this is a very good board if you would like use it with projects that need to interface external circuits and devices. It has quite a few devices contained inside the central chip. This is not a board for a beginning. You need to understand some very important concepts behind embedded programming before tacking a project using this board to ensure not having a really difficult time. This board also has some exposed risks that can turn it into a nice little miniature heating if you happen to hook up the wrong wires.
I burned mine after a week or so when tinkering with the PWM and ADC circuitry. I am not sure exactly how it happened, but I suspect it had something to do with a little too much power being pulled from one of the PWM's outputs. So be careful and read the manual!
You need to make sure you get the latest technical manual directory from www.analog.com. A few sites that sell this board have the old manual around which tells you an incorrect way to program the flash. This is very important if you use OpenOCD to connect to your board using a JTAG connection and execute any of the flash commands. The OpenOCD software at this time of writing does not have a driver that will work with this chip's (ADuC7026) flash controller. The only way to do this is to use the (correct and updated) manual to write the driver and compile it into OpenOCD.
There also exists a serial upload feature which I have never used (used the JTAG with OpenOCD instead). This could be used in case you are not able to get OpenOCD to erase and write to flash.
You may also use a work around with this broad to get started developing if you can not get the serial upload to work, or the OpenOCD flash commands. This is done by using the OpenOCD 'load_binary' command for address 0x10000, and then using resume 0x10000 or what ever the address is where your entry routine is in the binary loaded by the 'load_binary' command.