bit8_slave.c

Cygnal公司的著名产品C8051f系列单片机

//////////////UART1 8bit从机程序/////////////////
/////////////bit8_slave.c//////////////////////
#include <C8051F040.h>	// Register definition file.
#define aalen 6
typedef unsigned char uchar;
typedef unsigned int uint;
sfr16 RCAP2=0xca;
sfr16 RCAP3=0xca;
sfr16 RCAP4=0xca;
sfr16 TMR4=0xcc;
sfr16 TMR3=0xcc;
sfr16 TMR2=0xcc;
sfr16 PCA0CP0=0xfb;
sfr16 PCA0CP1=0xfd;
sfr16 PCA0CP2=0xe9;
sfr16 PCA0CP3=0xeb;
sfr16 PCA0CP4=0xed;
sfr16 PCA0CP5=0xe1;
xdata uchar aa[aalen]={0x41,0x42,0x43,0x44,0x45,0x46};
xdata uchar res[aalen];
xdata uchar k;
xdata uchar t;
bit isfirstdata;
void delay1ms(uint time);
void uart1_ini();
void t1_ini();
void t1_baud(uchar t1h);
void config (void) ;
void uart1_ini(){
    SFRPAGE = 0x01;    
    SCON1 = 0x10;       // 工作在8bit模式，接收使能
    SCON1 &= 0xFC; 	//清中断标志
    EIE2 |= 0x40;        //开启UART1中断
    t1_ini();
 }
void t1_ini(){
    SFRPAGE = 0x00;
    CKCON = 0x10;   // T1采用系统时钟，不分频
    TMOD = 0x20;    // T1为8bit自动重载模式
    TCON = 0x40;    // TR1置1，启动定时器
}
void t1_baud(uchar val){//T1溢出率设置，溢出率为（T1时钟频率）/(val)
	SFRPAGE = 0x00;
	TH1 = ~val+1;     
	TL1 = TH1;     
}
void config (void) {
    WDTCN = 0x07;	//看门狗禁止
    WDTCN = 0xDE;   
    WDTCN = 0xAD;
    SFRPAGE = 0x0F;
    XBR0 = 0x00;	
    XBR1 = 0x00;	
    XBR2 = 0x44;	// Crossbar 交叉开关配置使能,UART1配置在P0.0-P0.1
    XBR3 = 0x00;    // 
    SFRPAGE = 0x0F;
    P0MDOUT = 0x00; // TX0和RX0为开漏模式，故宜加上拉电阻
    P1MDIN = 0xFF;  // Input configuration for P1
    SFRPAGE = 0x0F;
    CLKSEL = 0x00;  
    OSCXCN = 0x00;	
    OSCICN = 0x84;	
    //采用内部晶振，为24.5MHZ8分频
}   //End of config
void main(){
	config();
	uart1_ini();
	t1_ini();
	t1_baud(80);//波特率为：3062500/(80×2)=19140,从而波特率约为19200bps
	EA=1;
	k=0;
	t=0;
	SFRPAGE=0x00;
	TR1=1;//等待主机发送数据
	while(1);
}
void uart1_ISR() interrupt 20{//UART1中断程序
	if(RI1){
		res[t]=SBUF1;
		t++;
		if(t==1)//接收到第一个数据时，从机开始发送数据，实现全双工
			SBUF1=aa[k]+0x30;
		RI1=0;
	}
	if(TI1){
		k++;
		if(k<aalen){
			SBUF1=aa[k]+0x30;//将发送数据+0x30以区别与主机的数据
		}
		TI1=0;
	}
}