Hello, here my problem:
I am using AVR GCC compiler for programming Atmega168 microcontroller . I am using an I2C communication, my problem is when I receive a command I run a function and the result of this function should be store in a global variable and remain with this value till next time I need to run this function. OK, this should be possible using an static variable declared in the global part.
static unsigned int value=8; // that's my case
However it doesnt work, it always recovers the same value, 8 in the example.
I would apreciatte if anyone can help me. Thank you
2  3695  JosAH 11,448
Recognized Expert MVP
Hello, here my problem:
I am using AVR GCC compiler for programming Atmega168 microcontroller . I am using an I2C communication, my problem is when I receive a command I run a function and the result of this function should be store in a global variable and remain with this value till next time I need to run this function. OK, this should be possible using an static variable declared in the global part.
static unsigned int value=8; // that's my case
However it doesnt work, it always recovers the same value, 8 in the example.
I would apreciatte if anyone can help me. Thank you
I use Atmega/128 micro processors myself for one project and I suspect that
your watchdog reset the entire thing. A watchdog acts as a leaking bucket: i.e.
when the bucket is empty it resets the cpu; you have to refill the bucket from
time to time to keep your cpu from resets. You can also disable the watchdog
mechanism so your cpu will never be reset by a watchdog.
When your cpu is reset the program's initialized data is loaded from flash rom
again which could explain the behaviour you just described. Disabling watchdogs
can be done by setting the cpu's bootstrap flag; check your manual.
kind regards,
Jos
BINGO!, you were completely right.
Thank you very much Jos, I was going crazy with that
I use Atmega/128 micro processors myself for one project and I suspect that
your watchdog reset the entire thing. A watchdog acts as a leaking bucket: i.e.
when the bucket is empty it resets the cpu; you have to refill the bucket from
time to time to keep your cpu from resets. You can also disable the watchdog
mechanism so your cpu will never be reset by a watchdog.
When your cpu is reset the program's initialized data is loaded from flash rom
again which could explain the behaviour you just described. Disabling watchdogs
can be done by setting the cpu's bootstrap flag; check your manual.
kind regards,
Jos
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