Electronic – n open source USB to JTAG circuit I can include in the PCB design

armjtag

Im trying to find out if it would be possible to build/include a USB to JTAG circuit on my experiment circuit board I'm designing. My aim is not to reinvent the wheel, but use something that is already out there, and simple/small enough to add to my PCB design.

I want to be able to program and debug my Atmel SAM3S chip using JTAG, via USB.

I've seen devices like the USB to JTAG programmer from Modular Circuits, and it looks like this can be fairly easily integrated into my design, however, I'm not too sure if their license allows this.

I've tried to Google around a bit for alternative more open sourced designs, but couldn't really find something. Can anyone refer me to a Open Source project for USB > JTAG circuits, that are available online?

Best Answer

Note that I haven't used this system myself, but the following project called opendous-jtag is compatible with OpenOCD and may be worth a look. The software license is the fairly liberal MIT license and it's based on open source hardware you should be able to replicate:

http://code.google.com/p/opendous-jtag/

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Electronic – ARM Cortex (M3-M4): manufacturer and development IDE

At the risk of sounding like a broken record...

PSoC5 is your answer! (It's amazing how many times PSoC is the answer)

PSoC5

The PSoC5 MCU has an ARM Cortex M3 core, and a bunch of other brilliant features that practically no other MCU has. Unlike other MCUs, setting up the peripherals is as fun as eating ice cream, and you can even create your own in Verilog! The IDE is pretty good, and totally free.

PSoC Creator

The Development Kit is great, and full of features and comes with the programmer, which you can use for your future projects. It's not too expensive.

Electronic – Program only runs when debugging in GDB – using Open OCD and Olimex arm-usb-ocd-h jtag to program at91sam3su

$ telnet localhost 4444
> halt
target state: halted
target halted due to debug-request, current mod
xPSR: 0x81000000 pc: 0x00080107 msp: 0x20000598
> flash write_image blinky/blinky.elf

You usually need reset init before a flash erase/write, halt may not be enough. In gdb it is monitor reset init.

The flash also needs to be erased before writing: flash write_image erase unlock blinky/blinky.elf

Best Answer

Related Solutions

Electronic – ARM Cortex (M3-M4): manufacturer and development IDE

Electronic – Program only runs when debugging in GDB – using Open OCD and Olimex arm-usb-ocd-h jtag to program at91sam3su

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