patchAVR C Runtime Library - Patches: patch #6768, Addition to util/setbaud.h

 
 

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patch #6768: Addition to util/setbaud.h

Submitted by:  Frédéric Nadeau <fnadeau>
Submitted on:  Thu 05 Mar 2009 04:21:09 PM UTC  
 
Category:  None Priority:  7 - High
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open

Thu 12 May 2011 10:28:38 PM UTC, comment #2:

Hi Frédéric,

On line 16 of this patch you are defining BAUD_SYNC to 0 in the header file. Then later on, you check to see if it is not defined, if so then define BAUD_SYNC to 0. Shouldn't that first definition on line 16 be removed?

Eric Weddington <arcanum>
Project Administrator
Thu 05 Mar 2009 04:43:04 PM UTC, comment #1:

After reread, it should be:

UCSRC |= _BV(1<<UMSEL);

But I guess that most of you already spotted that.

Frédéric Nadeau <fnadeau>
Thu 05 Mar 2009 04:21:09 PM UTC, original submission:

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);
}

Frédéric Nadeau <fnadeau>

 

Attached Files

 

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Items that depend on this one: None found

 

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2011-05-12 arcanum Priority5 - Normal => 7 - High
    2009-03-05 fnadeau Attached File- => Added setBaud.diff, #17593

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