276 CHAPTER 8 Monitor Mode Debugging
J-Link / J-Trace (UM08001) ©
2004-2017 SEGGER Microcontroller GmbH & Co. KG
8.4 Monitor code
A CPU core-specific monitor code is necessary to perform monitor mode debugging
with J-Link. This monitor performs the communication with J-Link while the CPU is in
debug mode (meaning in the monitor exception). The monitor code needs to be com-
piled and linked as a normal part of the application. Monitors for different cores are
available from SEGGER upon request at support_jlink@segger.com.
In general, the monitor code consists of three files:
• JLINK_MONITOR.c: Contains user-specific functions that are called on debug
mode entry, exit and periodically while the CPU is in debug mode. Functions can
be filled with user-specific code. None of the functions must block the generic
monitor for more than 100ms.
• JLINK_MONITOR.h: Header file to populate JLINK_MONITOR_ functions.
• JLINK_MONITOR_ISR.s: Generic monitor assembler file. (Should not be modified
by the user)Do NOT touch.
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