Hi
I want to put a serial number into a dsPIC - there's four bytes of user space in the flash which would be ideal.
Is there any reasonably easy way of stopping this from being changed when new software is programmed using a PicKit programmer? I know I could read it and re-write it, but I want something which moderately tech-savvy customers can do.
Cheers
I should add that this would be less than one hundred units, so no custom parts. If it comes to it I'll use a serial number chip, but I'd rather not bother.
Cheers
Do some of those parts have some eeprom? That's intended for that sort of purpose.
This has a table which shows the erase and write blocks for a dsPIC.
I dunno whether a PicKit can pick ( hah! ) and choose which blocks it reprograms or not. The single examples using an ICD3 I've seen used did not but that was on a PIC24 and on a PIC32. Serial numbers were managed with a barcode on the case, and there were Noi User Serviceable Parts Inside - upgrades were done only in an RMR facility.
Check the configuration bytes at 0xf8010 - 0xf8017. They are reserved as User Unit ID Bytes.
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