#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L //系統(tǒng)頻率
#define BAUD 9600 //串口波特率
#define NONE_PARITY 0 //無校驗
#define ODD_PARITY 1 //奇校驗
#define EVEN_PARITY 2 //偶校驗
#define MARK_PARITY 3 //標(biāo)記校驗
#define SPACE_PARITY 4 //空白校驗
#define PARITYBIT EVEN_PARITY //定義校驗位
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;
sfr AUXR = 0x8e; //輔助寄存器
sfr T2H = 0xd6; //定時器2高8位
sfr T2L = 0xd7; //定時器2低8位
sfr P_SW1 = 0xA2; //外設(shè)功能切換寄存器1
#define S1_S0 0x40 //P_SW1.6
#define S1_S1 0x80 //P_SW1.7
sbit P22 = P2^2;
sbit P30=P3^0;
bit busy;
BYTE RXtemp;
bit RX_flag=0; //接收到串口數(shù)據(jù)標(biāo)志
//延時函數(shù)
void delay(WORD t)
{
WORD t1;
for(;t>0;t--)
{
for(t1=0;t1<200;t1++);
}
}
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P6M0 = 0x00;
P6M1 = 0x00;
P7M0 = 0x00;
P7M1 = 0x00;
ACC = P_SW1;
ACC &= ~(S1_S0 | S1_S1);
P_SW1 = ACC;
#if (PARITYBIT == NONE_PARITY)
SCON = 0x50; //8位可變波特率
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
SCON = 0xda; //9位可變波特率,校驗位初始為1
#elif (PARITYBIT == SPACE_PARITY)
SCON = 0xd2; //9位可變波特率,校驗位初始為0
#endif
T2L = (65536 - (FOSC/4/BAUD)); //設(shè)置波特率重裝值
T2H = (65536 - (FOSC/4/BAUD))>>8;
AUXR = 0x14; //T2為1T模式, 并啟動定時器2
AUXR |= 0x01; //選擇定時器2為串口1的波特率發(fā)生器
ES = 1; //使能串口1中斷
EA = 1;
while(1)
{
}
}
/*----------------------------
UART 中斷服務(wù)程序
-----------------------------*/
void Uart() interrupt 4
{
if (RI)
{
RI = 0;
RXtemp = SBUF;
switch(RXtemp)
{
case '1':P30=1;
break;
case '2':P30=0;
break;
} //清除RI位
}
if (TI)
{
TI = 0; //清除TI位
//清忙標(biāo)志
}
}
發(fā)送1時，LED燈亮
發(fā)送0時，LED無反應(yīng)這是什么原因，求大家?guī)兔?br />
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