[avrdude-dev] Reading and writing a calibration byte in an ATTiny12

[James A.R. Koehler]

Hi,

   I am programming an ATTiny12 and I have some code which sets the 
calibration byte into a flash location so that my program can then put 
it in the OSCAL register.  In my program, the code looks like:

        ldi     r31, CALIBRATION_ADDRESS >> 8                     /; 
calibration byte to be written to 0x3ff/
        ldi     r30, CALIBRATION_ADDRESS & 0xff
        lpm

        out     OSCCAL, r0

   With Windows and Studio 4, it is then easy to read the calibration 
byte and to then write it to the CALIBRATION_ADDRESS which is location 
0x3ff.

   I'd prefer to do this using avrdude in a Linux machine.  I think I 
should be able to do this in the 'terminal' mode of avrdude but, because 
I'd like to program a number of these processors in one session,  I'd 
rather do it with a script file.  Is this possible?

   Also, I have a document describing avrdude 4.2 written by Brian Dean 
in September, 2003.  Is there a more recent version of this very helpful 
document for the more recent versions of avrdude?

   Jim