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printf statement not working after putchar statement is used.

arjun pal

Hi All
I am using following putchar routine.

void srl_putchar(unsigned char send)
{
SBUF = send;
while (!TI);
TI = 0;
}

after using above routine to transfer a character via serial port i continued with
 
printf("%c%c",dle,etx);
but program control remained infinitely in printf().
So i want to know,
What is the problem with srl_putchar() routine ?
Thanks in advance!

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  • 0

    Your putchar does things in a different order than the putchar that printf uses.

    The Keil putchar does things in this order.

    while (!TI);
TI = 0;
SBUF = c;

    It's pretty easy to see why printf stops working after srl_putchar is called.

    Why don't you use the putchar that's already provided?

    Jon

Reply
  • 0

    Your putchar does things in a different order than the putchar that printf uses.

    The Keil putchar does things in this order.

    while (!TI);
TI = 0;
SBUF = c;

    It's pretty easy to see why printf stops working after srl_putchar is called.

    Why don't you use the putchar that's already provided?

    Jon

Children