> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Matt Rhys-Roberts
> Sent: 01 March 2010 11:12
> To: Microcontroller discussion list - Public.
> Subject: [PIC] C18 & PIC18F8627: first printf() destroys SPBRG setting
> 
> I'm using printf() to talk directly to EUSART1, without going via the
> usart.h library. We decided to avoid this library for now in order to
> keep code as direct and simple as possible.
> 
> printf() appears to call code in file
> c:\MCC18\src\pmc_common\USART\_usartpc.asm , which clears SPBRG when
> first run, causing serial timing to fail. However, if I manually
re-set
> SPBRG in the watch window, it remains uncleared and serial
transmission
> continues happily.
> 
> Q1) Any idea why this has to happen, and what could/should be done
about
> it?
> Q2) Does anyone have any optimal examples of setting up printf()
> explicitly without using usart.h ?

I would suggest that since you are using the printf library function,
it's probably assuming you are also using the supplied functions to open
the USART which is OpenUSART() IIRC.

If you want to keep code simple and direct, then using printf is not a
good start, it's probably one of the most complex functions in the
standard C library.

Regards

Mike

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