scanf() function for reading integer from serial port

There were several problem with your program (as Stefan) pointed out.

1. There were enabled interrupts that there were no interrupt service routines for.

• The serial port initialization caused a spurious receive interrupt.

• The format specifiers for scanf were invalid.

#include <reg51.h>
#include <stdio.h>

void init_8051(void);


void main(void)
{
char a;
int b;
long c;
int argsread;
init_8051();
while(1)
{
printf("\n enter a signed byte ,int, and long \n");
argsread = scanf("%bd %d %ld", &a, &b, &c);
printf("\n %d arguments read \n",argsread);
printf("\n %bd %d %ld \n", a, b, c );
}
}


void init_8051(void)
{
SCON  = 0x50;	/* SCON: mode 1, 8-bit UART, enable rcvr      */
TMOD |= 0x20;   /* TMOD: timer 1, mode 2, 8-bit reload        */
TH1   = 221;    /* TH1:  reload value for 1200 baud @ 16MHz   */
TR1   = 1;      /* TR1:  timer 1 run                          */
TI    = 1;      /* TI:   set TI to send first char of UART    */
}

There were several problem with your program (as Stefan) pointed out.

1. There were enabled interrupts that there were no interrupt service routines for.

• The serial port initialization caused a spurious receive interrupt.

• The format specifiers for scanf were invalid.

#include <reg51.h>
#include <stdio.h>

void init_8051(void);


void main(void)
{
char a;
int b;
long c;
int argsread;
init_8051();
while(1)
{
printf("\n enter a signed byte ,int, and long \n");
argsread = scanf("%bd %d %ld", &a, &b, &c);
printf("\n %d arguments read \n",argsread);
printf("\n %bd %d %ld \n", a, b, c );
}
}


void init_8051(void)
{
SCON  = 0x50;	/* SCON: mode 1, 8-bit UART, enable rcvr      */
TMOD |= 0x20;   /* TMOD: timer 1, mode 2, 8-bit reload        */
TH1   = 221;    /* TH1:  reload value for 1200 baud @ 16MHz   */
TR1   = 1;      /* TR1:  timer 1 run                          */
TI    = 1;      /* TI:   set TI to send first char of UART    */
}

8 feb 2003,
Hello jon ward,
Thanks you for the prompt replies and kind
interest shown to help me. But unfortunately the program is not working on host pc dscope simulator (after compilation). I shall send you the *.lst ,*.m51 ,omf ,*.hex ,*.h,*.c files as attachment files.
Please send me your email address. My address is c_p_gopal@hotmail.com
thanks
gopal

Contact technical support directly.

Jon

10 feb 2003
dear jon ward
thank you very much for your kind replies .I shall do as told by you and contact technical support directly.

I once again thank you for the wonderful advice and help.

thank you
gopal