51单片机蓝牙模块

51单片机的蓝牙模块，是在蓝牙通讯的基础上，进行蓝牙51模块与外部蓝牙发射接收设备之间，相互收发数据。并且其引脚为VCC，GND，TXD，RXD，可以通过串口通信与外部上位机或单片机通信。

代码如下（注意蓝牙模块是5V供电）

#include<reg52.h>

void init();
void delay(unsigned int ms);

unsigned char input;
void display(unsigned char num_decimal);
unsigned char code character[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,
0xf8,0x80,0x90};

sbit SegSelection1=P2^0;
sbit SegSelection2=P2^1;
sbit SegSelection3=P2^2;
sbit SegSelection4=P2^3;
sbit p1=P1^0;
sbit p2=P1^1;

void main()
{
p1=1;
p2=0;
init();

while(1)
{

display(input);
}
}

void init(void)
{
EA = 1;
ES = 1;
PCON = 0x00;
SCON = 0x50; //串口工作在方式1，并且启动串行接收

TMOD = 0x20;
TH1 = 0xFd; //设置波特率 9600
TL1 = 0xFd;
TR1 = 1;
}

void rt() interrupt 4 //中断4：串行收发数据
{
EA=0;
if(RI==1)
{
input=SBUF-48;
RI=0;

SBUF=input+48;
while(!TI);
TI=0;
}
EA=1;
}

void display(unsigned char num_decimal)    //在数码管显示传输的数据
{
unsigned int thousand,hundred,tens,unit;

thousand=num_decimal/1000;
hundred=(num_decimal-thousand*1000)/100;
tens=(num_decimal-thousand*1000-hundred*100)/10;
unit=num_decimal%10;

SegSelection1=0;
P0=character[thousand];
delay(5);
SegSelection1=1;

SegSelection2=0;
P0=character[hundred];
delay(5);
SegSelection2=1;

SegSelection3=0;
P0=character[tens];
delay(5);
SegSelection3=1;

SegSelection4=0;
P0=character[unit];
delay(5);
SegSelection4=1;
}

void delay(unsigned int ms)
{
unsigned int x;
while(ms--)
for(x=110;x>0;x--);
}