Re: Memory corruption (?) I don't understand

[David Brown]

On 22/06/2021 18:00, Ian Molton wrote:
> On 22/06/2021 12:59, BERTRAND Joël wrote:
>>      Hello,
>>
>>      I'm writing a firmware for a board that uses a ATMega 1284. Firmware
>> continuously restarts
> 
> This is likely a branch through zero.
> 
> Common causes on AVR are bad function pointers, and stack damage.
> 

A good way to check this is to track the reset cause.  At startup, look
for the reset cause (and print it out on debugging, record it in logs,
or whatever is appropriate for the system), then clear the reset cause
flags.  If you find you are starting up and there are no reset cause
flags set, then you haven't actually reset - you've just jumped to
address 0.