AVR-Chat

Problem found..

The page erase MUST come before the write to the SPM buffer.

Interestingly, the approach I was using, would seem to at worst, give
me half a page of data written, but in fact it gives all FFs.

Get a packet
Write half a buffer
Get another packet
Erase Page
Write half a buffer
Write page


I changed the sequence to:

Get a packet
Erase Page
Write half a buffer
Get another packet
Write half a buffer
Write page

This works.