Some advice needed to write modified data back into the boot eeprom for usage a

Christof Eb. · 2008-06-11 16:47

Hi, I would be very thankful for some help!

I want to do the following:

....


PUB main
....
a:=b*var1     'use predefined variable
....
var1:= xyz     'modify predefined variable

writeback(@var1,1)    ' ??????? IS THERE A FUNCTION TO WRITE BACK A MODIFIED LONG INTO THE BOOT EEPROM?????
.....

DAT
var1   long   27     'have a variable in a dat-section with predefined data

Thanks alot for some input!
Christof

Mike Green · 2008-06-11 17:08

Look in the Propeller Object Exchange under the topic Data Storage. You'll find several objects that can be used to write to (or read from) EEPROM. If you write the variable back to the same location in EEPROM as it has in RAM (@var1), then, when the program next loads, the variable will have the new value.

Christof Eb. · 2008-06-11 18:36

Thank you, Mike,
I was not aware, that it was such simple, perhaps someone is looking for something too. So I post the solution
Christof

CON
....
  i2cSCL        = 28
'  i2cSDA        = 29
  EEPROMAddr    = $A0
.....

OBJ
  i2cObject      : "basic_i2c_driver"
......
PUB main
....
    evar1++   'Modify the variable
    writeback_long(@evar1)
....
PUB writeback_long(adr) | eepromlocation, eepromData 
    eepromlocation:= adr
    eepromData:=     LONG[noparse][[/noparse]adr]
    i2cObject.WriteLong(i2cSCL, EEPROMAddr, eepromLocation, eepromData)
....

DAT
evar1                   long    42

Some advice needed to write modified data back into the boot eeprom for usage a

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