Downloading to flash without deleting EEPROM

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daveavr
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Posted by daveavr: Sun. Feb 20, 2005 - 08:36 PM
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Hi Freaks,

I think this may have been discussed before but I couldn't find any previous posts. Is it possible to download to flash without deleting the contents of the EEPROM?
I'm using the AVRStudio command line (stk500.exe).
Assuming its not possible, is it possible to read the EEPROM contents, program the flash, then reload the EEPROM using the stk500.exe command line?

Thanks
Dave.

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AVR Microcontrollers, megaAVR and tinyAVR
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soare0
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Posted by soare0: Sun. Feb 20, 2005 - 09:00 PM
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It is possible, but I don't know how with stk 500, I use avrdude from winavr or dt006 from bascom, and there you can do it.

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danni
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Posted by danni: Sun. Feb 20, 2005 - 09:06 PM
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It depends, which AVR you use.
Some AVRs can prevent EEPROM content from erase.
Please look on the fuse bits of your AVR.

Peter

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Bronze Marktheusch
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Posted by theusch: Sun. Feb 20, 2005 - 09:16 PM
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Quote:

is it possible to read the EEPROM contents, program the flash, then reload the EEPROM using the stk500.exe command line?

I don't know if it is possible in one operation, but I think that STK500 has "read-EEPROM" functionality, so it sounds like a two-step operation would work. [Well, you might want to verify the EEPROM read, adding another step.]

The read-EEPROM-first-then-reprogram-all is a common procedure that can be carried out manually, or be supported by some programming tools (CodeVision, ChipBlaster).

Lee

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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