Awesome
pycs
Python Based ARM CoreSight Debug and Trace Tools
- PyCS is a python based JTAG/SWD debugger for ARM chips.
- Its current focus is systems using Cortex-M ARM CPUs.
- It reads the SoC SVD files to give full peripheral/register decodes for a wide variety of Cortex-M based chips.
What do I need?
- A PC with Python3 installed (Host System)
- A target system with a Cortex-M ARM cpu (Targets)
- An SWD debug interface (Debug Interface)
Installing the tool
- Run "make" - this will build the ARM disassembler library.
- Run "./pycs" in the same directory you extracted the code to.
- If you don't have permissions to access USB devices you can fix that (with a udev rules file) or run with "sudo ./pycs"
Current Targets
$ ./pycs -l
supported targets:
axoloti : Axoloti Synth Board (STM32F427xG)
efm32lg : EFM32 Leopard Gecko Starter Kit (EFM32LG990F256)
frdm_k64f : FRDM-K64F Kinetis Development Board (MK64FN1M0VLL12)
mb1035b : STM32F3 Discovery Board (STM32F303xC)
mb1075b : STM32F4 Discovery Board (STM32F429xI)
mb997c : STM32F4 Discovery Board (STM32F407xx)
nRF51822 : Adafruit BLE USB dongle (nRF51822)
nRF52dk : Nordic nRF52DK Development Board (nRF52832)
nucleo-l432kc : Nucleo-L432KC (STM32L432KC)
saml21 : Atmel SAM L21 Xplained Pro Evaluation Board (ATSAML21J18B)
tepo : Teenage Engineering Pocket Operator (EFM32LG890F128)
Dependencies
- sudo apt-get install python3-lxml
- sudo apt-get install python3-hid
Using the Tool
$ ./pycs -t mb997c
pycs: ARM CoreSight Tool 1.0
STM32F407xx: compiling ./vendor/st/svd/STM32F40x.svd.gz
ST-Link usb 0483:3748 serial u"H\xffj\x06PuIU'3\x04\x87"
target voltage 2.889V
mb997c*>
It has an interactive CLI.
- '?' for menu help
- '?' for command completion/argument help
- TAB for command completion
- 'help' for general help
Features
- display memory
- disassemble memory
- display system control registers
- display peripheral registers
- halt/go the cpu
- program flash
- Segger RTT client
- measure counter frequencies
- etc. etc.