JTAG Archives - Embedded Artistry

26 June 201715 December 2021

OSX: Getting Pesky FTDI Debugging Devices to Work

Many useful FTDI-based debugging devices exist for those of us working in the embedded world. These devices are extremely useful and provide JTAG and SWD capabilities, as well as acting as I2C, SPI, or Serial protocol converters. With an FTDI debug tool, you can use your host machine to debug and interface with a variety …

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21 October 201614 December 2021

WFI and JTAG

JTAG and wfi do not place nicely together. You've probably noticed this yourself, wondering why JTAG can't connect or a halt/breakpoint doesn't work. When the ARM core is executing the wait for interrupt operation, the core is placed into a low power mode and the core clock is gated. This wreaks havoc with JTAG, as …

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21 September 201615 August 2023

Debugging Strategy: Finding Version from a Memory Dump

Have you ever had a device that's in a weird state, and you're curious what version of software is on it so you can load the correct debug symbols? Here's a strategy for figuring that out: Connect to device over JTAG when it's in the desired state Use your JTAG tool to dump the contents …

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