Overview Q & A Rating & Review
Debugging support for ARM Cortex-M Microcontrollers with the following features:
Support J-Link, OpenOCD GDB Server
Partial support for PyOCD and textane/stlink (st-util) GDB Servers (SWO can only be captured via a serial port)
Initial support for the Black Magic Probe (This has not been as heavily tested; SWO can only be captured via a serial port)
Cortex Core Register Viewer
In some cases the st-util GDB server can report incomplete/incorrect registers, so there may be some issues here.
Peripheral Register Viewer (Defined through standard SVD file)
SWO Decoding - "console" text output and binary data (signed and unsigned 32-bit integers, Q16.16 fixed point integers, single percision floating point values)
The registers that are part of the DWT, TPIU, and ITM debug components will automatically be configured and do not need to be set in firmware.
Firmware may still need to enable the SWO output pin - as this part of the setup is microcontroller dependant.
Decoding ETM data over the SWO pin is not currently supported.
Support for Custom ITM Data Decoders:
Live graphing of decoded ITM data.
Raw Memory Viewer ("Cortex-Debug: View Memory" command)
Ability to view and step through the disassembled binary. There are three ways that disassembled code will be shown:
Disassembly code will automatically be shown if it cannot locate the corresponding source code.
You can manually see the disassembly for a particular function ("Cortex-Debug: View Disassembly (Function)" command)
You can set the debugger to always show show disassembly ("Cortex-Debug: Set Force Disassembly" command)
Globals and Static scopes in the variables view
Initial support for Rust code (most functionality is working; disassembly views and variables view may still have issues)
RTOS Support (J-Link and OpenOCD - RTOS supported depends on GDB server support)
As a general rule do not try to use stepping instructions before the scheduler of your RTOS has started - in many cases this tends to crash the GDB servers or leave it in an inconsistent state.
Additional Graphing Options
Enhanced SVD Auto-selection
https://marcelball.ca/projects/cortex-debug/ for usage information Acknowledgments
Parts of this extension are based upon Jan Jurzitza's (WebFreak) code-debug extension (
https://github.com/WebFreak001/code-debug). His project provided an excellent base for GDB MI parsing and interaction.