b_commond.c

此程序实现无线信标定位

#include<AT89X51.H>
#include<intrins.h>

#define EN	P2_0
#define RW	P2_1
#define RS	P2_2
#define DATA	P1

/*
void che_busy(void);
void send_d(unsigned char data_in);
void send_i(unsigned char comm);
unsigned char read_ram(void);
*/

//;================================================
//测忙碌子程序
//;RS=0,RW=1,E=H,D0-D7=状态字
//;================================================
void che_busy(void)
{
	unsigned char q;
	RS = 0;		//CLR RS
	RW = 1;		//SETB RW
	do
	{				//JB P0.7,$
		P1 = 0xFF;	//MOV P0,#0FFH ;测忙碌子程序
		EN = 1;		//SETB E
		q = P1; 
		EN = 0;		//CLR E
	}
	while(q & 0x80);
}

//;===============================================
//;写数据子程序
//;RS=1,RW=0,E=高脉冲,D0-D7=数据
//;===============================================
void send_d(unsigned char data_in)
{

	che_busy();		//LCALL CHK_BUSY ;写数据子程序
	RS = 1;			//SETB RS
	RW = 0;			//CLR RW
	DATA = data_in;	//MOV P0,A
	EN = 1;			//SETB E
	_nop_();		//NOP
	_nop_();			//NOP
	EN = 0;			//CLR E

	
}

//;===============================================
//;写指令子程序
//;RS=0,RW=0,E=高脉冲,D0-D7=指令码
//;===============================================
void send_i(unsigned char comm)
{
	che_busy();		//LCALL CHK_BUSY
	RS = 0;			//CLR RS
	RW = 0;			//CLR RW
	DATA = comm;	//MOV P0,A
	EN = 1 ;		//SETB E	
	_nop_();			//NOP
	_nop_();			//NOP
	EN = 0;			//CLR E
}
/*
//;读RAM值
unsigned char read_ram(void)
{
	unsigned char temp;
	che_busy();

	P0 = 0xFF;	//MOV P0,#0FFH ;测忙碌子程序
	RS = 1;		//SETB RS
	RW = 1;		//SETB RW
	EN = 1;		//SETB E
	_nop_();
	_nop_();
	temp = DATA;
	EN = 0;
	return(temp);
}
*/
//;********************初始化**********************
void lcd_ini(void)
{
	P1 = 0xff;
	P2 = 0xff;
	P3 = 0xff;
	send_i(0x38);		//LGS0: MOV A,#34H ;34H--扩充指令操作
						//LCALL SEND_I
	send_i(0x08);		//MOV A,#30H ;30H--基本指令操作
						//LCALL SEND_I
	send_i(0x06);		//MOV A,#01H ;清除显示
						//LCALL SEND_I
	send_i(0x01);		//MOV A,#06H ;指定在资料写入或读取时，光标的移动方向
						//LCALL SEND_I ;DDRAM 的地址计数器(AC)加1
	send_i(0x0C);		//MOV A,#0CH ;开显示,关光标,不闪烁
						//LCALL SEND_I
}