STC12C5A60S2單片機(jī)實(shí)現(xiàn)AD采樣并液晶顯示(數(shù)字燃油表).doc

.數(shù)字燃油表模擬電路設(shè)計(jì)可實(shí)現(xiàn)以下功能：1、 推動(dòng)滑動(dòng)變阻器，能使LCD從0顯示到1002、 檔顯示數(shù)字低于10時(shí)，燈亮，LCD顯示“oil low”以下為C程序：#include#include#define uchar unsigned char#define uint unsigned int#define Delay4us()_nop_();_nop_();_nop_();_nop_();sbit LED=P10;sbit LCD_RS=P26;sbit LCD_RW=P25;sbit LCD_EN=P27;sbit SCL=P20; /I2C時(shí)鐘引腳sbit SDA=P21; /I2C數(shù)據(jù)輸入輸出引腳uchar Recv_Buffer4; /數(shù)據(jù)接收緩沖uint Voltage=0,0,0,0; /數(shù)據(jù)分解為電壓x.xxbit bdata IIC_ERROR; /I2C錯(cuò)誤標(biāo)志位uchar LCD_Line_1= ;/延時(shí)void delay(int ms)uchar i;while(ms-) for(i=0;i250;i+) Delay4us();/LCD忙檢測bit LCD_Busy_Check()bit Result;LCD_RS=0;LCD_RW=1;LCD_EN=1;Delay4us();Result=(bit)(P0&0x80);LCD_EN=0;return Result;/寫指令void LCD_Write_Command(uchar cmd)while(LCD_Busy_Check();LCD_RS=0;LCD_RW=0;LCD_EN=0;_nop_();_nop_();P0=cmd;Delay4us();LCD_EN=1;Delay4us();LCD_EN=0;/ 寫數(shù)據(jù)void LCD_Write_Data(uchar dat)while(LCD_Busy_Check();LCD_RS=1;LCD_RW=0;LCD_EN=0;P0=dat;Delay4us();LCD_EN=1;Delay4us();LCD_EN=0;/初始化void LCD_Initialise()LCD_Write_Command(0x38);delay(5);LCD_Write_Command(0x0c);delay(5);LCD_Write_Command(0x06);delay(5);LCD_Write_Command(0x01);delay(5);/設(shè)置顯示位置void LCD_Set_Position(uchar pos)LCD_Write_Command(pos|0x80);/顯示一行void LCD_Display_A_Line(uchar Line_Addr,uchar s)uchar i;LCD_Set_Position(Line_Addr);for(i=0;i16;i+)LCD_Write_Data(si);/ 將模數(shù)轉(zhuǎn)換后得到的值分解存入緩存void Convert_To_Voltage(uchar val)uchar Tmp; /最大值為255,對應(yīng)100L,255/100=2.55val=val*0.393;Voltage2=val/100+0; /Tmp=val%100; / Voltage1=Tmp/10+0;Tmp=Tmp%10;Voltage0=Tmp+0;/啟動(dòng)I2C總線void IIC_Start()SDA=1;SCL=1;Delay4us();SDA=0;Delay4us();SCL=0;/停止I2C總線void IIC_Stop()SDA=0;SCL=1;Delay4us();SDA=1; Delay4us();SCL=0;/ 從機(jī)發(fā)送應(yīng)答位void Slave_ACK()SDA=0;SCL=1;Delay4us();SCL=0;SDA=1;/ 從機(jī)發(fā)送非應(yīng)答位void Slave_NOACK()SDA=1;SCL=1;Delay4us();SCL=0;SDA=0;/發(fā)送一字節(jié)void IIC_SendByte(uchar wd)uchar i;for(i=0;i8;i+) /循環(huán)移入8位SDA=(bit)(wd&0x80);_nop_();_nop_();SCL=1;Delay4us();SCL=0;wd=1;Delay4us();SDA=1; /釋放總線并準(zhǔn)備讀取應(yīng)答SCL=1;Delay4us();IIC_ERROR=SDA; /IIC_ERROR=1表示無應(yīng)答SCL=0;Delay4us();/接收一字節(jié)uchar IIC_ReceiveByte()uchar i,rd=0x00;for(i=0;i8;i+)SCL=1;rd=1;rd|=SDA;Delay4us();SCL=0;Delay4us();SCL=0;Delay4us();return rd;/連續(xù)讀入4路通道的A/D轉(zhuǎn)換結(jié)果并保存到Recv_Buffervoid ADC_PCF8591(uchar CtrlByte)uchar i;IIC_Start();IIC_SendByte(0x90); / 發(fā)送寫地址if(IIC_ERROR=1)return;/ IIC_SendByte(CtrlByte); /發(fā)送控制字節(jié)/if(IIC_ERROR=1)return;IIC_Start(); /重新發(fā)送開始命令I(lǐng)IC_SendByte(0x91); / 發(fā)送讀地址if(IIC_ERROR=1)return;IIC_ReceiveByte(); /空讀一次,調(diào)整讀順序Slave_ACK(); /收到一字節(jié)后發(fā)送一個(gè)應(yīng)答位for(i=0;i4;i+)Recv_Bufferi+=IIC_ReceiveByte();Slave_ACK(); /收到一個(gè)字節(jié)后發(fā)送一個(gè)應(yīng)答位Slave_NOACK();IIC_Stop(); /收到一個(gè)字節(jié)后發(fā)送一個(gè)非應(yīng)答位/ 向 PCF8591發(fā)送1字節(jié)進(jìn)行AD轉(zhuǎn)換/主程序void main()LED=0;LCD_Initialise();while(1)ADC_PCF8591(0x04);if(Recv_Buffer026)LCD_Display_A_Line(0x00, Oil Low! );LED=1;elseConvert_To_V