LPCXpresso IDE中的主题 Re: Add watchpoint to stackpointer

Add watchpoint to stackpointer

simonwyss — Fri, 28 Jul 2017 14:40:32 GMT

I would like to add a watchpoint to the stackpointer to monitor the maximum level of the stack.

The following solution didn't work for me (LPCXpresso 8.2.2, Hardware LPC54102):
How to use Watchpoints
I can attach watchpoints to variables but not to the CPU registers.

1. Add Watch for Stack Pointer:

2. Want to add Watchpoint, didn't work! - No option for "Add Watchpoint"

Add Watchpoint works for Variables:

Re: Add watchpoint to stackpointer

converse — Fri, 28 Jul 2017 18:47:26 GMT

It is not possible to watch registers on Cortex-M cpus.

this thread may be of interest

https://community.nxp.com/thread/428355

Re: Add watchpoint to stackpointer

simonwyss — Fri, 28 Jul 2017 21:26:51 GMT

Thank you for your response.

I already saw the article Monitoring Stack Size
This works for me.

However, I was mislead by the article How to use Watchpoints

This article documents that it should be possible to use Watchpoints on the Stackpointer on ARM CPUs !!!

Re: Add watchpoint to stackpointer

converse — Fri, 28 Jul 2017 21:55:33 GMT

It doesn't say that at all.

The document states "Since watchpoint 'watch' access to memory...". I.e. It works on memory. So this example is watching a write to address 0x10007D000. I guess they chose this address in case the stack grows that large.

Re: Add watchpoint to stackpointer

simonwyss — Sat, 29 Jul 2017 10:22:24 GMT

Thank you for your explanation.
Now I understand how this mechanism works!