`UCSZ0` vs `UCSZ00`

[matwey]

Hello,

I've found that some headers in avr/io (for instance, iom324pa.h) has

#define UCSZ00 1
// ...
#define UCSZ10 1

for each UART separately, while others (for instance, iom324pb.h) has only

#define UCSZ0   1

for all UARTs. Note, for instance, 324PB has three of them.
What is the purpose for having different names for the same thing and how to write portable code?

[sprintersb]

Dunno. iom324pb.h is from Microchip, presumably auto-generated. So you'll have to ask them.

iom324pa.h is from 2009. Maybe you could use iom324pa.h from Microchip, too. But be prepared that there are quite some differences to the stock version.