藍橋杯單片機CT107D_18_模數轉換器PCF8591的基本應用-有解無憂

#include<reg52.h>
#include"IIC.h"

sbit S4 = P3^3;               //定義獨立按鍵
unsigned char dat_Rd1 = 0;	  //存放Rd1資料
unsigned char dat_Rb2 = 0;	  //存放Rb2資料
unsigned char state = 0;	  //標志位
unsigned char code SEG_code[18] = 
	{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
	 0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,
	 0xbf,0x7f};	          //定義共陽數碼管段碼內容:0~F,—,.

void Select_HC138(unsigned char n)
{
	switch(n)
	{
		case 5:
			P2 = (P2 & 0x1f) | 0xa0;
			break;
		case 6:
			P2 = (P2 & 0x1f) | 0xc0;
			break;
		case 7:
			P2 = (P2 & 0x1f) | 0xe0;
			break;
	}
}

void Delay_tube(unsigned char t)   //數碼管延時函式
{
	while(t--);
}

void Show_tube(unsigned char position,unsigned char value)
{
	Select_HC138(7);
	P0 = 0xff;
	Select_HC138(6);
	P0 = 0x01 << position;
	Select_HC138(7);
	P0 = value;
}

void Show_all()
{
	Select_HC138(7);
	P0 = 0xff;
	Select_HC138(6);
	P0 = 0xff;
}

void Display_tube(unsigned char channel,unsigned char dat)
{
	Show_tube(0,SEG_code[16]);
	Delay_tube(100);
	Show_tube(1,SEG_code[channel]);	      //顯示通道
	Delay_tube(100);
	Show_tube(2,SEG_code[16]);
	Delay_tube(100);

	Show_tube(5,SEG_code[dat/100]);       //顯示電壓的百位
	Delay_tube(100);
	Show_tube(6,SEG_code[(dat/10)%10]);	  //顯示電壓的十位
	Delay_tube(100);
	Show_tube(7,SEG_code[dat%10]);        //顯示電壓的個位
	Delay_tube(100);

	Show_all();
}

void Delay_keys()          //按鍵延時函式
{
	unsigned char i,j;
	i = 108;
	j = 145;
	
	do
	{
		while(--j);
	}while(--i);
}

void Press_keys()
{
	if(S4 == 0)
	{
		Delay_keys();
		if(S4 == 0)
		{
			if(state == 0)
			{
				state = 1;        //顯示Rb2
			}
			
			else if(state == 1)
			{
				state = 0;		  //顯示Rd1
			}
		}
		while(S4 == 0);
	}
}

void Read_Rd1()         //采樣光敏電阻Rd1的電壓
{
	IIC_Start();              //IIC總線起始信號
	IIC_SendByte(0x90);       //寫設備地址
	IIC_WaitAck();            //等待從機應答
	IIC_SendByte(0x01);       //寫控制字
	IIC_WaitAck();            //等待從機應答
	IIC_Stop();               //IIC總線停止信號

	IIC_Start();              //IIC總線起始信號
	IIC_SendByte(0x91);       //讀設備地址
	IIC_WaitAck();            //等待從機應答
	dat_Rd1 = IIC_RecByte();  //讀取PCF8591通道1的資料
	IIC_Ack(0);               //產生非應答信號
	IIC_Stop();               //IIC總線停止信號
}

void Read_Rb2()			//采樣電位器Rb2的電壓
{
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x03);
	IIC_WaitAck();
	IIC_Stop();

	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();
	dat_Rb2 = IIC_RecByte();
	IIC_Ack(0);
	IIC_Stop();
}

void main()
{
	Select_HC138(5);
	P0 = 0x00;       //關閉蜂鳴器和繼電器
	while(1)
	{
		Press_keys();
		switch(state)
		{
			case 0:
				Read_Rd1();
				Display_tube(1,dat_Rd1);
				break;
			case 1:
				Read_Rb2();
				Display_tube(3,dat_Rb2);
				break;
		}
	}
}

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