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Debugging with OpenOCD and gdb

Please use openocd 4.0 or newer.

This example assumes you have a Segger J-Link compatible JTAG adapter between your computer and the device (or dev board) you are debugging. It is possible to use an SWD (ST-Link) adapter instead, for this use openocd 0.7 or newer.

Start the openocd server with configuration files matching your hardware:

openocd -f interface/jlink.cfg -f target/stm32.cfg

Or, if you are using SWD:

openocd -f interface/stlink-v2.cfg -f target/stm32f1x_stlink.cfg

In a second window, start an interactive session with openocd:

telnet localhost 4444

This seems to be necessary to avoid "target is not halted" errors and other trouble later:

reset_config trst_and_srst

Stop the target (the arm processor):

reset halt

If you have not already flashed the binary, using for instance dfu-util, you can do it over JTAG like this:

reset init
flash write_image erase dso-lib.hex 0 ihex
reset halt

In a third window, start gdb or gdbtui:

(gdb) file dso-lib.elf
(gdb) target remote localhost:3333"
(gdb) load dso-lib.elf

You should now be able to run and debug:

(gdb) set $pc = Reset_Handler
(gdb) display/i $pc
(gdb) stepi

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