* Code adapted from Atmel AVR ApplICation Note AVR306
* PolLEDmode driver forUART， this is the similar to the
* library default putchar（） and getchar（） in ICCAVR
*/
#include
#include
#include “uart.h”
/* iniTIalize UART */
void InitUART（ unsigned char baudrate ）
{
UBRR = baudrate; /* set the baud rate */
UCR = BIT（RXEN） | BIT（TXEN）; /* enable UART receiver and transmitter */
}
/* Read and write funcTIons */
unsigned char ReceiveByte（ void ）
{
while （ ！（USR & （1《; /* return the data */
return UDR;
}
void TransmitByte（ unsigned char data ）
{
while （ ！（USR & （1《; /* wait for empty transmit buffer */
UDR = data; /* start transmitTIon */
}
#ifdef TEST
/* main - a simple test program*/
void main（ void ）
{
InitUART（ 11 ）; /* set the baudrate to 19，200 bps using a
3.6864MHzcrystal */
while （ 1 ） /* forever */
{
TransmitByte（ ReceiveByte（） ）; /* echo the received character */
}
}
#endif
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