Tag Archives: Jtag

SplashTag – Jtag Debugger for ARM and DSP

We have just sent off another batch of gerber files this time it’s for a new product, SplashTag. With our up coming product range we thought it would be helpful of us to offer a Jtag for those of you wanting to write your own code for the board and not use our ethernet bootloader. SplashTag is a programmer & debugging device that will work with Coocox, TI’s Code Composer, Rowley CrossWorks and more. It’s based on the XDS100v2 so should also mean it’s compatible with TI’s free Code Composer license I blogged about previously. We deviated slightly from the standard XDS100v2 and broke out the spare Uart on the FT2232HL giving you a USB serial port, which always comes in handy when debugging.

The SplashTag uses a standard 20pin ARM jtag connector. To make it as flexible as possible we will also sell a couple of adapters allowing the SplashTag to connect to TI’s DSPs via their 14pin jtag connection or to an ARM based microprocessor using a 10way JTag header.

Code Composer Studio – Surprisingly Free

Part of making a product is selecting the right Microcontroller to do the job. There is a lot to consider, price, availability, features and the cost of the toolchain. Some compilers, IDEs & Jtags can cost thousands.

We have chosen the LM3S6100 (Didn’t have enough RAM) LM3S6432 for the SplashLight. TI (Texas Instruments) offer Code Composer Studio an eclipse based IDE which supports their entire range of microcontrollers. A quick look at the product page shows you can get a 30 day evaluation version but otherwise you will need to spend $495 per seat. Well that is unless you have a XDS100 based jtag which almost all TI’s LM3S dev kits come with! You simply activate the “Free Limited License” it’s only limit is that it will only work with XDS100 jtags, so no code or time limit. I guess they don’t like to shout about it so bigger businesses will just pay the per seat fee’s. But for Makers, Enthusiasts or people with no money it’s great! TI’s wiki page for the XDS100 lists all the suppliers for standalone XDS100 jtags, circuits to make your own or just pick up the cheapest TI LM3S dev kit you can find.

Continue Reading →

JTAG issues with Stellaris Cortex M3 LM3S

Whilst working on the software for our, yet to be named network light controller, I managed to stop the Jtag from being able to connect to our LM3S6100 ARM microprocessor.  All code composer would do when I pressed debug was to show me a very unhelpful dialog saying the “Frequency is out of range”.

Useful Code Composer Jtag Error Dialog - "Frequency is out of range"

I knew the board was okay as I had previously re-flashed it many times. Working backwards, my last change was code to control GPIO Port F. Referring to the schematic, Port F shares a pin with the TRST Line (PB7).  So it seems I had accidentally overridden the TRST line and made it a GPIO, stopping the jtag from gaining control of the device, opps!

Click “Continue reading” for the fix.. Continue Reading →

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