Looking through the HAL for the dual core processors, its pretty easy to stop a core from itself by calling HAL_PWREx_EnterSTOPMode() or similar. However, I don't see an obvious route to, for example, stop the M4 core from code which is running in the M7 (acknowledging the additional management this might require). Is there a call you can make in the M7 to disable the D2 domain (as a specific example).
Finding the specific controls and calls is probably easy but I can't work out the strategy for doing this from the reference manual. In fact it seems a bit odd to me that you would put the D2 domain to sleep from within the D2 domain!
I think this issue is different to just flipping the Boot M4 bit in the options bytes which seems like a workaround and this then needs to be re-enabled (probably worth mentioning I'm looking at a bootloader right now). At present, the M4 is just sitting and waiting until it receives a flag from the M7 and is probably fine as any change to its program in flash is likely to result in a crash but I am really looking at making sure it's off to avoid any risks.
Has anyone got any thoughts around that or can identify the right STM example project?
Thanks
