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

[BERTRAND Joël]

David Brown a écrit :
> 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.
> 
> 

MCUSR=02 (after external reset)
=================
 Systella L100-A
=================

Booting firmware 2021062218
SPI initialized
Reset LORA
Reset LORA done
LoRaWAN 1.1
Initialization SX1262
Initialization SX1262 done
0004A30B0013F046
MAC initialization
LDL_MAC_addChannel:786>chIndex=0 freq=868100000 minRate=0 maxRate=5
LDL_MAC_addChannel:786>chIndex=1 freq=868300000 minRate=0 maxRate=5
LDL_MAC_addChannel:786>chIndex=2 freq=868500000 minRate=0 maxRate=5
cb type=11
processInit:990>set radio reset: ticks=126
processRadioReset:1005>clear radio reset: ticks=126
MAC initialization done
lora_send
processStartRadioForEntropy:1057>listen for entropy: ticks=127
processEntropy:1074>read entropy: ticks=127 entropy=1385813498
cb type=0
LDL_MAC_ready
LDL_MAC_otaa
LDL_MAC_addChannel:786>chIndex=0 freq=868100000 minRate=0 maxRate=5
LDL_MAC_addChannel:786>chIndex=1 freq=868300000 minRate=0 maxRate=5
LDL_MAC_addChannel:786>chIndex=2 freq=868500000 minRate=0 maxRate=5
MCUSR=00
=================
 Systella L100-A
=================

Booting firmware 2021062218
SPI initialized
...


RESET flags are always 0 when firmwware restarts...