replace polling with interrupt

Hello Everyone,
I am trying for the first time to write an interrupt driven routine.
Here I want to transmit n*8 bytes of data over a serial interface

While( Count < n) {
// sent an byte

for(;;) // i will be polling the registers to check which flag is
set
{
read_register()
If (Tx_Flag_Successful)
Decrement Count
break
else
Count=0 ; Resend data from begining
}
}

Now if I want to replace the above with an interupt driven process, I
can do so
easily for the inner for loop(). If I want to replace even the while
loop
( i.e transmit a bolck of data with interrupts) how can I do it ?
Please advice me on this.

Thanks in advance,
Warm Regards,
Swathi

.

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