u_dis.c

一个超声波传感器与51单片机的通信程序,实现了距离的测量

#include<pic.h>

#define uchar 		unsigned char
#define uint		unsigned int
#define OK		0xf0
#define ERROR		0xf1
#define R		1
#define W		0

#define IIC_SCL		RB3		//IIC通信时钟
#define IIC_SDA		RB4		//IIC数据线
#define IIC_SDA_OUT	TRISB4 = 0	//IO口设为输出口
#define IIC_SDA_IN	TRISB4 = 1 	//IO口设为输入口

#define LCM_CS		RB7
#define LCM_WR		RB6	
#define LCM_DATA	RB5

#define ModeKey		RB1		//模式选择按键

uchar	dis[10];
uchar	Mode;		//模式记数
/******************************************************************** 
*
* 名称: wait_ms
* 说明: 4MHz晶体，PIC16F873
* 功能: 延时n ms
* 调用: 无
* 输入: ms 延时毫秒数,ms=n 延时n ms.
* 返回值: 无
***********************************************************************/
void wait_ms(uchar ms)
{  
   uchar i;
   for(;ms>0;--ms)
       for(i=168;i>0;--i)
       		asm("CLRWDT");
       return;
}

#include"e:\code\ultra_dis\lcm103.c"
#include"e:\code\ultra_dis\wr.c"



void MCU_Initi(void)		
{
	TRISB = 0b00000011;
	OPTION = 0b00000000;	//分配前分频器给Timer0 1:2 预分频
	PEIE = 1;
	GIE = 0;
	T1CON = 0b00000001;	//Timer1前分频为1:1，现在是关闭的
	TMR1IE = 0;		//Timer1中断禁止
	TMR1IF = 0;
	
	wait_ms(250);
	wait_ms(250);
	lcm103_initi();			
 }
 



void	main(void)
{
	uchar	DataBuff[4] = {0x44,0x44,0x44,0x44};
	uchar	i,Temp,Temp2;
	uint	DataInt;
	
	MCU_Initi();
	for(Temp=0;Temp<10;Temp++)
	{
		dis[Temp]=Temp;
	}
	WR_DATA10();
	
	wait_ms(250);
	wait_ms(250);
	wait_ms(250);
	wait_ms(250);
	Mode = 1;	
        while(1)
	{	
		if(ModeKey == 0)
		{
			wait_ms(10);
			if(ModeKey == 0)
			{
				if(Mode == 7)
					Mode = 1;
				else
					Mode++;		
			}
			while(!ModeKey);
		}
		switch(Mode)
		{
			case 1:	
			case 2: 
			case 3: 
			case 4:	AD_Test(Mode);
				break;
			case 5:	DisplayTemper();
				break;
			case 6: DisplayUltra();
				break;
			case 7: EEPROM_Test();
				wait_ms(250);
				wait_ms(250);
				wait_ms(250);
				wait_ms(250);
				Mode = 1;
				break;
			default :
				break;	
		}
		
	}	
}