unsigned short i;

void main() {

// Initialize USART module (8 bit, 19200 baud rate, no parity bit..)
Usart_Init(19200);

do {
if (Usart_Data_Ready()) { // If data is received
i = Usart_Read(); // Read the received data
Usart_Write(i); // Send data via USART
}
} while (1);
}//~!

i used program above to test serial port with hyperterminal. it suppose to be like i press 'a' from the keyboard then usart_read will read 'a' and usart_write will send character 'a' back and show 'a' in hyperterminal but it doenst work when i try. what is the problem ?