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setting breakpoint from code

franto over 6 years ago

Hi, my app (cortex m3) needs to set up a breakpoint directly from code, in order to jump to an interrupt when an instruction from a certain address is fetched. This WITHOUT using a debugger.

Any hint or tutorial? I think the only possible way is the patch block but it seems quite complicated.

Best regards

Franto

Top replies

Joseph Yiu over 6 years ago +2 suggested

You can use debug monitor exception for that: - set MON_EN(bit 16) in DEMCR (0xE000EDFC) - Set FPB comparator register 0-5 for instruction address, with bit 0 (ENABLE) set to 1, REPLACE (bit[31:30...
Joseph Yiu over 6 years ago in reply to franto +2 verified

You need to do a single step with the breakpoint disabled, and then re-enable the breakpoint and resume. To single step: set MON_PEND (bit 18) in DEMCR, and then exit debug monitor handler. regards...
Joseph Yiu over 5 years ago in reply to crlsvzqz +1

The Armv7-M architecture reference manual is here: https://developer.arm.com/documentation/ddi0403/latest/ See page C1-696 Do you have a debugger connected at the same time? Debug monitor and halt...