[avr-libc-dev] [patch #6768] Addition to util/setbaud.h

[Frédéric Nadeau]

URL:
  <http://savannah.nongnu.org/patch/?6768>

                 Summary: Addition to util/setbaud.h
                 Project: AVR C Runtime Library
            Submitted by: fnadeau
            Submitted on: jeu 05 mar 2009 16:21:09 GMT
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I noticed that util/setbaud.h cannot calculate baudrate for sync mode.

I did the following modification to the file. I doubt it will it the
next release, but I do beleive it is a good thing to have.

Basic explanation:
if BAUD_SYNC is define and equal to 1, a modified macro is use to
calculate baud rate.
If BAUD_SYNC is define and equal to 0 or not define, macro works as before.

Modification should not break code that use the current version of
setbaud.h.

Usage could be:
#include <avr/io.h>

#define F_CPU 4000000

static void uart_9600(void)
{
#define BAUD_SYNC 1
#define BAUD 9600
//Device specific declaration
#define XCK_DDR DDRB//For ATmega16A
#define XCK_DDx DDB0
#include <util/setbaud.h>
   UBRRH = UBRRH_VALUE;
   UBRRL = UBRRL_VALUE;
   UCSRC = _BV(1<<UMSEL);
   //Configure as clock source
   XCK_DDR |= _BV(1<<XCK_DDx);
}



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File Attachments:


-------------------------------------------------------
Date: jeu 05 mar 2009 16:21:09 GMT  Name: setBaud.diff  Size: 1 ko   By:
fnadeau

<http://savannah.nongnu.org/patch/download.php?file_id=17593>

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