[avr-libc-dev] [bug #13226] ERROR of PRINTF_LIB_FLOAT of WinAVR-20050214.

[anonymous]

URL:
  <http://savannah.nongnu.org/bugs/?func=detailitem&item_id=13226>

                 Summary: ERROR of PRINTF_LIB_FLOAT of WinAVR-20050214.
                 Project: AVR C Runtime Library
            Submitted by: None
            Submitted on: Mon 05/30/05 at 04:38
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open

    _______________________________________________________

Details:

email: address@hidden
attn: Eric B. Weddington
from: rongjianwei/ address@hidden  /Beijing,
China

subject: ERROR of PRINTF_LIB_FLOAT of WinAVR-20050214.

Good moring,

        I have met a problem about "PRINTF_LIB_FLOAT". In the
endless loop, it will occur a problem. After running a
few minutes, the sentence of "printf("%5.1f      
%9.2f\n",fahrenheit, (5.0/9.0) * (fahrenheit - 32.0))
" will display wrong characters. How to resolve it? 
The Source Code as follows.
        
*********************************************************************************************
/***************************************************
    Title:    4_1_6.c 
    Author:   ÈÖ½¨Î°(rongjianwei)
    Date:     2005/01/15
    Purpose:  
ͨ¹ý´®¿Ú¸ø¿ØÖÆ̨Êä³ö»ªÊÏÉãÊÏζȱ仯±í£¬µÚÈýÖÖ³ÌÐòд·¨¡£ÒýÈë·ûºÅ³£Á¿¡£
    needed
    Software: AVR-GCC
    needed
    Hardware: 
    Note:     To contact me, mail to
                  address@hidden
****************************************************/

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

#include <avr/io.h>


/*
 * System clock in Hz.
 */
#define SYSCLK   3686400UL //4000000 //14745600UL       /*
Note [2] */

/*
 * Compatibility defines.  This should work on
ATmega8, ATmega16,
 * ATmega163, ATmega323 and ATmega128 (IOW: on all
devices that
 * provide a builtin TWI interface).
 *
 * On the 128, it defaults to USART0.
 */
#ifndef UCSRB
# ifdef UCSR0A          /* ATmega128 */
#  define UCSRA UCSR0A
#  define UCSRB UCSR0B
#  define UBRR UBRR0L
#  define UDR UDR0
# else /* ATmega8 */
#  define UCSRA USR
#  define UCSRB UCR
# endif
#endif
#ifndef UBRR
#  define UBRR UBRRL
#endif

#define lower 0 /* lower limit of table */
#define upper 300 /* upper limit  */
#define step 20 /* step size  */

void
ioinit(void)
{

  UCSRB = _BV(TXEN);            /* tx enable */
//  UBRR = (SYSCLK / (16 * 9600UL)) - 1; /* 9600 Bd 
4M¾§Õñ×î¸ßËÙÂÊ¿É´ï19200*/
//  UBRR = (SYSCLK / (16 * 115200UL)) - 1; /* 115200
Bd */
  UBRR = (SYSCLK / (16 * 57600UL)) - 1; 

}

/*
 * Note [4]
 * Send character c down the UART Tx, wait until tx
holding register
 * is empty.
 */
int
uart_putchar(char c)
{

  if (c == '\n')
    uart_putchar('\r');
  loop_until_bit_is_set(UCSRA, UDRE);
  UDR = c;
  return 0;
}


int main(void)
{       /* print fahrenheit--celsius table for
f=0,20,'..,300 */
double fahrenheit;
double celsius;
  ioinit();
  
  for(;;){

    fdevopen(uart_putchar, NULL, 0); 
    printf("Fahrenheit  celsius\n");
    printf("»ªÊÏ          ÉãÊÏ\n");  // could not
display the chinese charaters(GB2312) 2004/08/10
    
    for(fahrenheit = lower; fahrenheit <= upper;
fahrenheit = fahrenheit + step ){
        printf("%5.1f       %9.2f\n",fahrenheit, (5.0/9.0)
* (fahrenheit - 32.0));
    }
  }
        
return(0);
}
/****************************************************/













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Carbon-Copy List:

CC Address                          | Comment
------------------------------------+-----------------------------
rongjianwei --AT-- sina --DOT-- com | Originator Email



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Date: Mon 05/30/05 at 04:38  Name: 4_1_6.rar  Size: 13.58KB   By: None

<http://savannah.nongnu.org/bugs/download.php?item_id=13226&item_file_id=2550>

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