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Is there a debugger for ARM Cortex M?
ARM Cortex-M’s support several “levels” of debug: Halting debug – This is the typical configuration you use with a debugger like GDB. In this mode, the core is halted while debugging. This mode requires access to the Debug Port via JTAG or SWD.
What to know when debugging Cortex-M0 hard fault?
In summary, when debugging HardFaults on Cortex-M0/Cortex-M0+ processors, several pieces of information are very useful: If the SP is pointing to an invalid memory location, then you won’t be able to extract the stack frame.
What does halting debug do in gdb mode?
Halting debug – This is the typical configuration you use with a debugger like GDB. In this mode, the core is halted while debugging. This mode requires access to the Debug Port via JTAG or SWD. We’ve walked through an overview of how ARM debug interfaces work in this article.
Where to find program counter on Cortex-M0?
The Program Counter in the Stack Frame (xSP+0x18) will tell you the address of the instruction that caused the fault. jyiu ‘s The Definitive Guide to the Arm Cortex-M0 has a good chapter detailing Fault Handling on the Cortex-M0. Thanks Drew. My book has an appendix on Troubleshooting too.
Where are the fault registers on a Cortex-M MCU?
All MCUs in the Cortex-M series have several different pieces of state which can be analyzed when a fault takes place to trace down what went wrong. First we will explore the dedicated fault status registers that are present on all Cortex-M MCUs except the Cortex-M0.
Do you need a debugger to debug a MCU?
Debugging an MCU requires attaching a debugger via JTAG and halting the core. Or does it? There are many situations where this debug strategy is not feasible such as on
What does divbyzero mean on an ARM Cortex M MCU?
Fields are only cleared by a system reset or by writing a 1 to them. This register is a 2 byte register which summarizes any faults that are not related to memory access failures, such as executing invalid instructions or trying to enter invalid states. DIVBYZERO – Indicates a divide instruction was executed where the denominator was zero.