Hi,
Just solve this !!(A sprintf problem)
Without sprintf the program gets compiled
and runs well.

# include<8051.h>
# include<stdio.h>
# include<stdlib.h>
# include<string.h>

typedef unsigned char byte;
typedef unsigned int word;
typedef unsigned long l_word;

unsigned char mess[12];

volatile data byte timer;
volatile data byte hi_flag;

float fl1=1.1;
float fl2=1.2;
float fl3;

//extern int vprintf(const char *,char *);
//extern char putchar(char);

// timer0 using register bank 2
void timer0_irq_proc(void) interrupt 1 using 2
{
if(timer != 0)
{
--timer;
}
else
{
hi_flag=1;
timer=250;
}
TR0=0;
TH0=(~(5000)) >> 8;
TL0=(~(5000)) & 0xff;
TR0 = 1;
}

#if 0

// UART initialisation using register bank 1
void uart0_int(void) interrupt 4 using 1
{
if(RI)
{
c=SBUF;
RI=0;
}
}
#endif

void tx_char(char c) // send a character to output
{
SBUF = c;
while(!TI)
;
TI=0;
}

//void putchar(char c)
//{
// SBUF = c;
// while(!TI)
// ;
// TI=0;
// return 0;
// return(c);
//}


void tx_str(char *str) // send a string to output
{
while(*str)
{
tx_char(*str++);
}
}


void stop(void)
{
_asm;
mov dptr,#0XA000;
movx a,@dptr;
nop;
_endasm;
}

void main(void)
{
// serial port initialisation done here
PCON=0x80;
SCON=0x50;
TMOD=0x21;
TCON=0;
TH1=0xF6;
TR1=1;

TR0=1;
ET0=1;
EA=1;

TI=0;
// SBUF='.';
hi_flag=1;
fl3=fl1+fl2;

sprintf(mess,"%c","a");
// tx_str(mess);


// strcpy(mess,fl3);

for(;;)
{
if(hi_flag)
{
tx_str("Hi da n");
hi_flag = 0;
}
stop();
}
}

I get the error as :
ASxxx error - Unresolved global _putchar
referred by module vprintf .

How to solve this ???
I know that this problem is due to sprintf
usage .

How to use sprintf in my program , so
that i can transfer it through my serial
port using tx_str() routine ?

karthik bala guru
sdcckarthik@yahoo.com