Debugging

Debugging is done with either OpenOCD's sysfsgpio interface on the Raspberry Pi or with an ST-Link V2 compatible programmer/debugger.

OpenOCD

Choosing "Update/Install OpenOCD" from the 'setup' menu, downloads the OpenOCD source code from github, and builds/installs it automatically. This takes about 45 minutes. It needs to be built from source, because the OpenOCD version from the Raspbian repository doesn't support the Raspberry Pi sysfsgpio interface yet.

Make the following connections between pins on the ARMinARM board:

STM32	Raspberry Pi
NRST	GPIO 4[*]
JTDO / PB3	GPIO 9
TMS / PA13	GPIO 25
JTCK / PA14	GPIO 11
JTDI / PA15	GPIO 10

[*] GPIO 4 is probably already connected to NRST with a jumper.

Debugging with OpenOCD

In 1 terminal:

arminarm openocd

In another terminal:

arm-none-eabi-gdb
(gdb) target extended-remote localhost:3333
(gdb) [do your thing]

Change 'localhost' to 'raspberrypi' or its IP address to connect to it remotely.

ST-Link flash & debug

Choose 'Update/Install ST-Link' from the 'setup' menu. Make SWD connections with an ST-Link V2 or Fx-Discovery.

Pin	Description	Designation
1 VDD_TARGET	VDD from application	VDD, DNC when powered from Pi
2 SWCLK	WD clock	JTCK / PA14
3 GND	Ground	GND
4 SWDIO	SWD data input/output	TMS / PA13
5 NRST	RESET of target MCU	NRST
6 SWO	Reserved	JTDO / PB3 (optional)

Flashing with an ST-Link V2 or Fx-Discovery.

st-flash --reset write build/leds.bin 0x08000000

Debugging with an ST-Link V2 or Fx-Discovery.

In 1 terminal:

st-util

In another terminal:

arm-none-eabi-gdb
(gdb) target extended-remote :4242
(gdb) load build/leds.elf
(gdb) r