Page 845 - 완) I MDP 프로젝트 작품 보고서(전체과 1학년)1.6

#define DATA_REGISTER_EMPTY (1<<UDRE)

#define RX_COMPLETE (1<<RXC)

unsigned char rx;

// USART0 Receiver buffer

#define RX_BUFFER_SIZE0 8
char rx_buffer0[RX_BUFFER_SIZE0];

#if RX_BUFFER_SIZE0<256

unsigned char rx_wr_index0,rx_rd_index0,rx_counter0;

#else
unsigned int rx_wr_index0,rx_rd_index0,rx_counter0;

#endif

// This flag is set on USART0 Receiver buffer overflow

bit rx_buffer_overflow0;

// USART0 Receiver interrupt service routine
interrupt [USART0_RXC] void usart0_rx_isr(void)

{

char status,data;
status=UCSR0A;

data=UDR0;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)

{

rx_buffer0[rx_wr_index0]=data;
if (++rx_wr_index0 == RX_BUFFER_SIZE0) rx_wr_index0=0;

if (++rx_counter0 == RX_BUFFER_SIZE0)
{

rx_counter0=0;

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