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发表于 2009-8-23 16:09:52
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显示全部楼层
#include <io.h>
#include <interrupt.h>
#define fosc 11059200 //时钟频率
#define baud 9600 //串口波特率
#define RXB8 1
#define TXB8 0
//#define PE 2 //M16
#define UPE 2 //M128
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7
//宏定义
#define FRAMING_ERROR (1<<FE)
//#define PARITY_ERROR (1<<PE) //M16
#define PARITY_ERROR (1<<UPE) //M128
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
#define IGTON PORTD|= 0x10 //IGT点火信号
#define IGTOFF PORTD&=~0x10
#define RTSON PORTD|= 0x40 //RTS信号
#define RTSOFF PORTD&=~0x40
#define DTRON PORTD|= 0x20 //DTR信号
#define DTROFF PORTD&=~0x20
unsigned char MEMSBUF0[255],MEMSBUF1[255];
#define RX_BUFFER_SIZE0 255
volatile unsigned char rx_buffer0[RX_BUFFER_SIZE0];
volatile unsigned char rx_wr_index0,rx_rd_index0,rx_counter0;
volatile unsigned char rx_buffer_overflow0;
#define TX_BUFFER_SIZE0 255
volatile unsigned char tx_buffer0[TX_BUFFER_SIZE0];
volatile unsigned char tx_wr_index0,tx_rd_index0,tx_counter0;
#define RX_BUFFER_SIZE1 255
volatile unsigned char rx_buffer1[RX_BUFFER_SIZE1];
volatile unsigned char rx_wr_index1,rx_rd_index1,rx_counter1;
volatile unsigned char rx_buffer_overflow1;
#define TX_BUFFER_SIZE1 255
volatile unsigned char tx_buffer1[TX_BUFFER_SIZE1];
volatile unsigned char tx_wr_index1,tx_rd_index1,tx_counter1;
void mdelay(unsigned int ms) //0.1ms delay
{
unsigned int m=0;
for(;ms>0;ms--)
{
for(m=0;m<56;m++)
{;}
}
}
void delay50ms(unsigned int ms)
{
for(;ms>0;ms--)
{
mdelay(50);
}
}
void uart0_init(void) //串口初始化
{
UCSR0B = 0x00; //disable while setting baud rate
UCSR0A = 0x00;
//UCSR0C =(1<<UPM01)|(1<<UCSZ01)|(1<<UCSZ00); //8bit+1bit stop(偶校验)
UCSR0C =(1<<UCSZ01)|(1<<UCSZ00); //无校验
UBRR0L=(fosc/16/(baud+1))%256;
UBRR0H=(fosc/16/(baud+1))/256; //波特率设置
UCSR0B =(1<<RXEN0)|(1<<TXEN0)|(1<<RXCIE0);
}
void uart1_init(void)
{
UCSR1B = 0x00; //disable while setting baud rate
UCSR1A = 0x00;
UCSR1C =(1<<UCSZ11)|(1<<UCSZ10); //8bit+1bit stop
UBRR1L=(fosc/16/(baud+1))%256;
UBRR1H=(fosc/16/(baud+1))/256;
UCSR1B =(1<<RXEN1)|(1<<TXEN1)|(1<<RXCIE1); //RXCEN TXCEN
}
void putchar0(unsigned char c)
{
while (!(UCSR0A&(1<<UDRE0)));
UDR0=c;
}
void putchar1(unsigned char c)
{
while (!(UCSR1A&(1<<UDRE1)));
UDR1=c;
}
SIGNAL(SIG_USART0_RECV)
{
unsigned 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;
rx_buffer_overflow0=1;
}
}
}
unsigned char get0_char(void)
{
unsigned char data;
while (rx_counter0==0);
data=rx_buffer0[rx_rd_index0];
if (++rx_rd_index0 == RX_BUFFER_SIZE0) rx_rd_index0=0;
cli();
--rx_counter0;
sei();
return data;
}
SIGNAL(SIG_USART1_RECV)
{
unsigned char status,data;
status=UCSR1A;
data=UDR1;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
{
rx_buffer1[rx_wr_index1]=data;
if (++rx_wr_index1 == RX_BUFFER_SIZE1) rx_wr_index1=0;
if (++rx_counter1 == RX_BUFFER_SIZE1)
{
rx_counter1=0;
rx_buffer_overflow1=1;
}
}
}
unsigned char get1_char(void)
{
unsigned char data;
while (rx_counter1==0);
data=rx_buffer1[rx_rd_index1];
if (++rx_rd_index1 == RX_BUFFER_SIZE1) rx_rd_index1=0;
cli();
--rx_counter1;
sei();
return data;
}
int main(void)
{
unsigned char i=0,j=0,k=0;
rx_buffer_overflow0=0;
rx_wr_index0=rx_rd_index0=rx_counter0=0;
rx_buffer_overflow1=0;
rx_wr_index1=rx_rd_index1=rx_counter1=0;
PORTD = 0xF3;
DDRD = 0xff;
uart1_init();
uart0_init();
sei();
while(1)
{
i = 0;
while (!rx_counter0) ;
//delay50ms(5000);
while (rx_counter0)
{
MEMSBUF0 = get0_char();
i++;
}
for(j=0;j<i;j++)
{
putchar0(MEMSBUF0[j]);
}
}
我使用avrstudio编译的，为什么程序最多只能接受98个字节的数据，超过98字节的数据就丢失，请帮忙分析一下原因了！ |
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楼主
非常的好。