Hi,
Please some one have a look and fix my following code.

msg interrupt 4 (void)
{
unsigned char j,xchar;
unsigned int xaddress;
xchar=rec_232(); // waiting for a correct command
xaddress=0x0000;
if (xchar==0x40) // fills blank for 64 byte in the eeprom
{
for (j=0x00; j<0x40; j++)
{
write_eeprom(xaddress,0x00);
xaddress++;
}
}
send_rs232(0x39); //sending a request
do { //writing data into eeprom
xchar=rec232(); //waiting for data
write_eeprom(xaddress,xchar);
xaddress++;
} while (xchar != 0x38); // until a sentinel come
}
// int end

The problem after a signal for intterupt:
The second loop exit after 50 bytes data transfer,
BUT not exit because the sentinel char 0x38 arrived.
It just exit some how, then the program start
doing the first loop then do the second loop for
the second times and after 50 bytes data transfer
again the second loop exit not because the sentinel
data 0x38 arrived, but still not EXIT from the
INTERRUPT routine. The chip like Hang.

Any comments will be appreaciated,
and thank you in advance.
Kurnia Brahmana