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...mber string index to the address of it in memory (in other words, load it from Flash into a global var, and then use that address when the iSerialNumber pointer is requested), but from how it is implemented, I couldn?t figure it out. I?ll look again. http://ww1.microchip.com/downloads/en/AppNotes/01176A.pdf <http://ww1.microchip.com/downloads/en/AppNotes/01176A.pdf> has code (Example 6) that allows you to specify a custom function to generate the string descriptor responses. It looks like it should be fairly simple to special-case the serial number descriptor. -- Charles Lepple clepple at...

iSerialNumber does not need to be unique per device - it is not very many bits wide. I?m pretty sure I don?t *need* iSerialNumber?I mean, I could just remove it from the report descriptor altogether. But since it is available to give, and we are writing each board?s serial number into flash as part of the micro-controller programming (we aren?t talking a staggering number of boards per year