Hi all
I want to debug my program through Rs232 interface of the PC.
But why the "scanf" and "scanf_P" function doesn't work while printf works?
I have googled and find only the example of using printf,but no scanf.
Does avr-gcc not support scanf very well?Or there is something wrong in the
way I use scanf.
That is my code:
I find why run to "sanf",the mcu seems dead.
Thanks.
/*****************************************************
Project : rs232_debug
Version :
Date : 2007-6-3
Author :
Company :
Comments:
Chip type : atmega16
Program type : Application
Clock frequency : interal 8 MHz
*****************************************************/
# include <stdio.h>
# include <avr/io.h>
# include <avr/pgmspace.h>
void USART_Init(void);
static int usart_putchar(char c,FILE * stream );
static int usart_getchar(FILE * stream);
static FILE mystdio =
FDEV_SETUP_STREAM(usart_putchar,usart_getchar,_FDEV_SETUP_RW);
char buffer[81];
int main(void)
{
int tmp = 0;
USART_Init();
stdout = &mystdio;
stdin = &mystdio;
while(1)
{
//test for hardware
//loop_until_bit_is_set(UCSRA,RXC);
//tmp = UDR;
//printf("Reveive data is : %d\n",tmp);
printf("Please input one string:\n");
scanf("%s",buffer);
printf("Your input string is:%s\n",buffer);
printf_P(PSTR("Please input one number:\n"));
scanf_P(PSTR("%d"),&tmp);
printf_P(PSTR("Yout input number is:%d\n"),tmp);
}
//exit
return (0);
}
int usart_putchar(char c,FILE * stream )
{
if(c=='\n')
{
usart_putchar('\r',stream);
}
loop_until_bit_is_set(UCSRA,UDRE);
UDR = c;
return (0);
}
int usart_getchar(FILE * stream)
{
loop_until_bit_is_set(UCSRA,RXC);
return UDR;
}
void USART_Init(void)
{
// set baud [EMAIL PROTECTED]
const unsigned int BAUD = 9600;
const unsigned long XTAL = 8000000;
UBRRH = (unsigned char) ((XTAL/16/BAUD - 1)<<8);
UBRRL = (unsigned char) (XTAL/16/BAUD - 1);
// enable receive and transmit reg bit
UCSRB = (1<<RXEN) | (1<<TXEN);
}
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