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#include "STC12c5A.h"
#include "1602.h"
#include "2402.h"
#define uchar unsigned char
#define uint unsigned int
//聲明常量
#define ALCH 80 //醉駕標(biāo)準(zhǔn)80mg/L
//K_MG_MV和K_ZERO為傳感器校準(zhǔn)系數(shù)，要根據(jù)每個(gè)MQ-3模塊校準(zhǔn)
#define K_MG_MV 160/66 //傳感器靈敏度系數(shù)，每毫克/L對(duì)應(yīng)的10毫伏數(shù)
#define K_ZERO 0 //傳感器零點(diǎn)漂移，約130mV
//定義按鍵
sbit Key_Up = P3^6;
sbit Key_Down = P3^7;
//定義LED報(bào)警燈
sbit Led_Warn1 = P3^4;
sbit Led_Warn2 = P3^5;
//定義乙醇傳感器TTL電平輸出引腳
sbit DOUT = P1^4;
//定義標(biāo)識(shí)
volatile bit FlagStartAL = 0; //開(kāi)始轉(zhuǎn)換標(biāo)志
volatile bit FlagKeyPress = 0; //有鍵彈起標(biāo)志
//全局變量定義
uchar Threshold; //酒精濃度上限報(bào)警值
uint ALCounter; //酒精轉(zhuǎn)換計(jì)時(shí)器
uint ALValue; //酒精測(cè)量值
float ALtemp; //計(jì)算臨時(shí)變量
uint keyvalue, keyUp, keyDown; //鍵值
char * pSave; //EEPROM存盤(pán)用指針
//函數(shù)聲明
void Data_Init();
void Timer0_Init();
void Port_Init();
void ADC_Init();
uchar GetADVal();
void KeyProcess(uint );
//數(shù)據(jù)初始化
void Data_Init()
{
ALCounter = 0;
ALValue = 0;
Led_Warn1 = 1;
Led_Warn2 = 2;
keyvalue = 0;
keyUp = 1;
keyDown = 1;
}
//定時(shí)器0初始化，中斷時(shí)間約2毫秒
//計(jì)算：晶振11.0592MHz，定時(shí)器時(shí)鐘11059200/12=921600，每毫秒922個(gè)脈沖
// 16位定時(shí)器初值65536-1844=63692=0xf8cc
void Timer0_Init()
{
ET0 = 1; //允許定時(shí)器0中斷
TMOD = 1; //定時(shí)器工作方式選擇
TL0 = 0xcc; //
TH0 = 0xf8; //定時(shí)器賦予初值，大約為2毫秒中斷1次
TR0 = 1; //啟動(dòng)定時(shí)器
}
//定時(shí)器0中斷
void Timer0_ISR (void) interrupt 1 using 0
{
TL0 = 0xcc;
TH0 = 0xf8; //定時(shí)器賦予初值
//每1秒鐘啟動(dòng)一次AD轉(zhuǎn)換
ALCounter ++;
if (ALCounter >= 500)
{
FlagStartAL = 1;
ALCounter = 0;
}
}
void Port_Init() //設(shè)定AD啟動(dòng)；
{
P1M0 = 0x80; //10000000，P1.7作為AD輸入；
P1M1 = 0x80; //
}
void ADC_Init()
{
uint i;
P1ASF = 0x80; //設(shè)P1.7為AD輸入
ADC_RES = 0; //清先前的結(jié)果
ADC_CONTR|=0x80; //POWER=1,打開(kāi)ADC電源
for(i=5000;i>0;i--) ; //延時(shí)
ADC_CONTR = ADC_CONTR&0xE0; //1110,0000 清ADC_FLAG,ADC_START位和低3位
ADC_CONTR = ADC_CONTR&0xf8|0x07; //設(shè)置當(dāng)前通道號(hào)為P1.7
for(i=2500;i>0;i--) ; //延時(shí)
}
//進(jìn)行AD轉(zhuǎn)換，得到當(dāng)前酒精值
uchar GetADVal()
{
uint i;
ADC_CONTR&=0xf7;
for(i=250;i>0;i--); //待輸入電壓穩(wěn)定后開(kāi)始轉(zhuǎn)換
//ADC_RES = 0;
ADC_CONTR |= 0x08; //ADC_Start=1, 啟動(dòng)轉(zhuǎn)換
while((ADC_CONTR&0x10)==0); //等待轉(zhuǎn)換結(jié)束ADC_FLAG=1
ADC_CONTR&=0xe7; //清ADC_FLAG和ADC_START位，停止轉(zhuǎn)換
return ADC_RES;
}
//存入設(shè)定值
void Save_Setting()
{
pSave = (char *)&Threshold; //地址低位對(duì)應(yīng)低8位，高位對(duì)應(yīng)高8位
wrteeprom(0, *pSave); //存醉酒閾值低8位
DELAY(300);
pSave ++;
wrteeprom(1, *pSave); //存醉酒閾值高8位
DELAY(300);
}
//載入設(shè)定值
void Load_Setting()
{
pSave = (char *)&Threshold;
*pSave++ = rdeeprom(0);
*pSave = rdeeprom(1);
if ((Threshold>=255)||(Threshold<0)) Threshold = 80;
}
//按鍵處理程序，參數(shù)為鍵值，1為Up鍵，2為Down鍵
void KeyProcess(uint num)
{
switch (num)
{
case 1:
if (Threshold<255) Threshold++;
break;
case 2:
if (Threshold>1) Threshold--;
break;
default:
break;
}
L1602_int(2,9,Threshold);
Save_Setting();
}
void main()
{
uint i,j;
EA = 0;
Data_Init(); //數(shù)據(jù)初始化
Timer0_Init(); //定時(shí)器0初始化
Port_Init(); //端口初始化
ADC_Init(); //ADC初始化
EA = 1;
L1602_init();
L1602_string(1,1,"Welcome to ALCT! ");
L1602_string(2,1,"Lijiang Nbjsxy ");
//L1602_string(2,1,"Designed by AAA ");
//延時(shí)
for (i=0;i<1000;i++)
for (j=0;j<1000;j++)
{;}
//清屏
L1602_string(1,1," ");
L1602_string(2,1," ");
L1602_string(1,1,"Alcohol: mg/L");
L1602_string(2,1,"Setting: mg/L");
//載入設(shè)定值
Load_Setting();
L1602_int(2,9,Threshold);
while(1)
{
//如果FlagStartAL標(biāo)志置位，則進(jìn)行AD轉(zhuǎn)換
if (FlagStartAL == 1)
{
//酒精濃度換算，50mg/L=62.5ppm，傳感器靈敏度應(yīng)事先校準(zhǔn)
ALValue = 500 * GetADVal() / 256; //8位ADC，首先得到電壓值，單位10毫伏
ALValue = ALValue - K_ZERO; //首先減去零點(diǎn)漂移，一般是130mV
if (ALValue < 0) ALValue = 0;
ALValue = ALValue * K_MG_MV; //將mV轉(zhuǎn)變成mg/L，K_MG_MV系數(shù)需要校準(zhǔn)
L1602_int(1,9,ALValue);
if (ALValue > Threshold) Led_Warn1 = 0; //超過(guò)閾值，則 Led_Warn1燈報(bào)警，否則報(bào)警燈滅。
else Led_Warn1 = 1;
FlagStartAL = 0;
}
//查詢(xún)乙醇傳感器TTL電平，該指示燈為傳感器模塊報(bào)警
if (DOUT == 0) Led_Warn2 = 0;
else Led_Warn2 = 1;
//鍵盤(pán)查詢(xún)，在彈起時(shí)響應(yīng)
if ((Key_Up)&&(keyUp==0)) {FlagKeyPress = 1; keyvalue = 1;}
else if ((Key_Down)&&(keyDown==0)) {FlagKeyPress = 1; keyvalue = 2;}
if (FlagKeyPress == 1)
{
KeyProcess(keyvalue);
FlagKeyPress = 0;
}
if (!Key_Up) keyUp = 0;
else keyUp = 1;
if (!Key_Down) keyDown = 0;
else keyDown = 1;
DELAY(100);
}
}

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