Re: [avrdude-dev] stk500 and firmware 1.14

[Theodore A. Roth]

On Thu, 20 Feb 2003, Brian Dean wrote:

:)On Wed, Feb 19, 2003 at 09:30:09PM -0800, Theodore A. Roth wrote:
:)
:)> I'd call that RESET_DISABLE, since a value of 1 there seems to disable the 
:)> reset pin for io. Still vague on it though. Jason Kyle seems to understand 
:)> it better than I do. ;-)
:)
:)I was planning to call it 'reset' but have it be assigned values of
:)'dedicated' or 'io' (meaning the reset pin may be configured as an I/O
:)pin - for an example of this, see the ATmega8), the default being
:)'dedicated'.  The actual variable in the AVRPART structure, I called
:)that 'reset_disposition' :-) I know, my variable names are too long
:)...  In the code, I've got enums for RESET_DEDICATED and RESET_IO,
:)values 0 and 1 respectively.  Will that work?  (see patch)

That looks fine.

:)
:)> How do you set up the flash and eeprom page sizes for programming? The 
:)> eeprom page size is in the ext dev params and the flash size is in the 
:)> regular dev params.
:)> 
:)> Oh, page_size can be given in the config file under 'memory "flash"'. You
:)> might need to add page_size for the 'memory "eeprom"' section too.
:)
:)Yes, that's what I did.  However, the use of "paged" with regard to
:)eeprom memory seems to be a bit inconsistant.  With respect to flash,
:)it seems to imply that you need to use the "load page/write page"
:)instructions.  But none of the eeproms on any of their parts use
:)those, but, at least for for the ATmega128, it says the page size of
:)the eeprom is 8 bytes when talking about parallel programming.  So I'm
:)a bit confused about Atmel's use of the term.

Read the section in the m128 datasheet about parallel programming the 
eeprom. That should clear it up a bit. In short, you can program faster by 
having the device buffering a page of data (8 bytes for the m128).

:)
:)At any rate, at present, avrdude lets you set the page size of a
:)memory, even though "paged" is set to 'no'.  But since setting 'paged'
:)to 'yes' implies a different programming algorithm, it would be an
:)error to set it to 'yes' for the eeprom memories.  But as long as we
:)put a comment in the config file, I think it should be OK to set the
:)page size of the eeprom, but leave 'paged' set to 'no' - or would that
:)be too confusing?

Well, for the m128, it is paged when you are parallel programming the 
eeprom. For serial programming, paged is meaningless.

<snip>

:)Let me know if you are OK with the attached patch - I haven't done
:)anything with the extended dev command yet, just trying to get the
:)data needed for it at this point.

Looks good to me. Just need to clear up the eeprom paged confusion.

Ted