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Toss away your boring old SWD/JTAG adapters! This Black Magic Probe, designed by 1BitSquared with Black Sphere Technologies, is a next-generation debugging tool, perfect for your ARM Cortex hacking. Unlike most dongles, you don't need to use OpenOCD or STLink. Instead, the BMP is itself a GDB server port, emulated through the USB serial connection.
We just thought this was such a cool idea, and you also get a 'free' USB-serial adapter as well, with nice socket headers that you can plug into your target for dual GDB+printf debugging fun. Fully open source hardware, your purchase supports development and improvements!
From the 1BitSquared's Wiki page on GitHub:
The Black Magic Probe is a modern, in-application debugging tool for embedded microprocessors. It allows you see what is going on 'inside' an application running on an embedded microprocessor while it executes. It is able to control and examine the state of the target microprocessor using a JTAG or Serial Wire Debugging (SWD) port and on-chip debug logic provided by the microprocessor. The probe connects to a host computer using a standard USB interface. The user is able to control exactly what happens using the GNU source level debugging software, GDB.
Please note that not all chips/targets are supported! Please visit the documentation page to see whether your favorite chip is in the list. As of this writing it supports the following but more are being added so check the link for the latest!
Comes with 1 x Black Magic Probe, a 0.05" pitch SWD/JTAG ribbon cable, and a 0.1" pin header serial cable
Very Brief FAQ:
Visit their Wiki at http://black-magic.org
If you have further questions, you can also check out http://gitter.im/blacksphere/blackmagic
Product Dimensions: 35.0mm x 15.0mm x 12.0mm / 1.4" x 0.6" x 0.5"
Product Weight: 2.7g / 0.1oz