Hello, Arduiners :)!
Xtensa ISA reference mention data breakpoint registers, and ESP-IDF even has the code (xt_utils, set_watchpoint).
But how can these be used?
I mean, after I write the data address/length in a corresponding DBREAKA, DBREAKC registers, what would happen on data access?
An interrupt? Which on? How to hook on it?
I went with the gdbstub code, but quickly get lost. Is there any documentation on xtensa arch component of esp-idf? I mean, examples, docs, with these xt_... functions.
Thanks!
PS: Oh I forgot to mention what it is all about. I would like to get a control, wwhen one of FreeRTOS tasks accesses memory region of interest. After taking control and performing some job, control must be returned to the task which triggered the watchpoint.