Segger J-Link Debug Guide

The SEGGER J-Link is the recommended tool for debugging baremetal applications created using the Cascoda SDK. The SEGGER J-Link has good integration to gdb, using a ‘GDB Server’ program to bridge the hardware to the gdb tool.

Software Requirements:

Hardware Requirements:


Connecting to J-Link...
J-Link is connected.
Firmware: J-Link V10 compiled Jun  9 2020 13:38:07
Hardware: V10.10
S/N: xxxxxxxx
Feature(s): GDB
Checking target voltage...
Target voltage: 3.28 V
Listening on TCP/IP port 2331
Connecting to target...
Connected to target
Waiting for GDB connection...
arm-none-eabi-gdb -ex "target remote localhost:2331" bin/mac-dongle
Command Effect
load Download the binary onto device flash
monitor reset Reset and halt the target device
c Continue a halted device
b Set a breakpoint at the location (can be function name, filename:linenum, and more)
p Print the value of a symbol (can also use other forms like p/x to print in hexadecimal)
x Examine the memory values at an address (can also use other forms like x/10xb to print 10 bytes in hex)

GDB is a very powerful tool, there are many guides on the internet that will provide more detail, including the GDB documentation itself.