printf statement not working after putchar statement is used.

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!