//內(nèi)部溫度傳感器調(diào)試程序//
//利用過(guò)采樣實(shí)現(xiàn)16位精度//
//ADC0_TEMP_PRO.c
#include <C8051F040.h>
#define ADC0START temppage=SFRPAGE;SFRPAGE=0x00;AD0BUSY=1;SFRPAGE=temppage
#define STACK_LEN 128
//采樣128次，再將128個(gè)數(shù)據(jù)總和除以8
//處理后的數(shù)據(jù)相當(dāng)于16個(gè)原始數(shù)據(jù)之和，在數(shù)值表現(xiàn)形式上為16bit
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned long ulong;
sfr16 RCAP2=0xca;
sfr16 RCAP3=0xca;
sfr16 RCAP4=0xca;
sfr16 TMR4=0xcc;
sfr16 TMR3=0xcc;
sfr16 TMR2=0xcc;
sfr16 PCA0CP0=0xfb;
sfr16 PCA0CP1=0xfd;
sfr16 PCA0CP2=0xe9;
sfr16 PCA0CP3=0xeb;
sfr16 PCA0CP4=0xed;
sfr16 PCA0CP5=0xe1;
sfr16 ADC0VAL=0xbe;
sfr16 ADC0GT=0xc4;
sfr16 ADC0LT=0xc6;
uchar temppage;
bit isnewdata;
uint kk;
float temp;
uchar stack_index;
ulong total;
xdata float t[20];//存放溫度檢測(cè)數(shù)據(jù)，為20個(gè)數(shù)據(jù)
xdata uint mystack[STACK_LEN];//過(guò)采樣數(shù)據(jù)數(shù)組
void adc0_mux(uchar type,uchar source);
void adc0_source(uchar source);
void p3anolog_ini(uchar port);
void HVDA_ini(uchar gaind);
void adc0_ini();
void delay1ms(uint time);
void config();
void adc0_mux(uchar type,uchar source){//type 配置測(cè)量方式為差動(dòng)還是單端輸入
//source 為ADC0通道選擇(共有9個(gè)通道)
	SFRPAGE=0x00;
	AMX0CF=type;
	AMX0SL=source;
}
void adc0_source(uchar source){//ADC0通道選擇，為adc0_mux()的簡(jiǎn)化函數(shù)
	SFRPAGE=0x00;
	AMX0SL=source;
}
void p3anolog_ini(uchar port){//配置p3口模擬輸入管腳
	SFRPAGE=0x00;
	AMX0PRT=port;
	SFRPAGE=0x0f;
	P3MDIN&=~port;//將相應(yīng)管腳配置成模擬輸入口
}
void HVDA_ini(uchar gaind){//高壓差動(dòng)放大器配置
	SFRPAGE=0x00;
	HVA0CN=gaind;
}
void adc0_ini(){
	SFRPAGE=0x00;
	ADC0CF=0x80;//ADC0時(shí)鐘為系統(tǒng)時(shí)鐘17分頻，PGA增益為1
	ADC0CN=0x80;
	/*AD0EN=1，ADC0模塊使能
	AD0TM=0,ADC0為連續(xù)跟蹤模式
	AD0CM1:AD0CM0=00b,為AD0BUSY啟動(dòng)方式
	AD0LJST=0,數(shù)據(jù)存儲(chǔ)格式右對(duì)齊，即ADC0H存放12bit高四位*/
	REF0CN&=0x0f;//AD0VRS=0,ADC0參考電壓為VREFA
	REF0CN|=0x07;//TEMPE=1,內(nèi)部溫度傳感器工作
	/*BIASE=1,偏移產(chǎn)生器工作
	REFBE=1,內(nèi)部參考電平工作，電路部分須將VREF參考輸出(C8051F40的第12管腳)與VREF0(C8051F040的16管腳相連，并最好并聯(lián)一個(gè)4.7uF和0.1uF的旁路電容以電平濾波*/
	adc0_source(9);//選擇第9通道，即選擇溫度信號(hào)為AD轉(zhuǎn)換
	EIE2 |= 0x02;        //開(kāi)ADC0中斷
}
void delay1ms(uint time){//延遲1ms
	uint i;
	uint j;
	for (i=0;i<time;i++){
		for(j=0;j<300;j++);
	}
}	
void config(){//crossbar 使能，但并沒(méi)有進(jìn)行外圍設(shè)備配置
	WDTCN = 0x07;	// Watchdog Timer Control Register
  	WDTCN = 0xDE;   // Disable WDT    
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
	XBR0 = 0x00;	// XBAR0: Initial Reset Value
	XBR1 = 0x00;	// XBAR1: Initial Reset Value
	XBR2 = 0x40;	// crossbar使能與否并不影響此程序運(yùn)行
 	XBR3 = 0x00;    // XBAR3: Initial Reset Value
 	SFRPAGE = 0x0F;
 	P0MDOUT = 0x00; // Output configuration for P0 
 	P1MDOUT = 0x00; // Output configuration for P1 
	P2MDOUT = 0x00; // Output configuration for P2 
	P3MDOUT = 0x00; // Output configuration for P3 
	P4MDOUT = 0x00; // Output configuration for P4
	P5MDOUT = 0x00; // Output configuration for P5
	P6MDOUT = 0x00; // Output configuration for P6
	P7MDOUT = 0x00; // Output configuration for P7
 	P1MDIN = 0xFF;  // Input configuration for P1
	P2MDIN = 0xFF;  // Input configuration for P2
	P3MDIN = 0xFF;  // Input configuration for P3
	SFRPAGE = 0x0F;
 	CLKSEL = 0x00;  // Oscillator Clock Selector
	OSCXCN = 0x00;	// EXTERNAL Oscillator Control Register	
	OSCICN = 0x84;	// Internal Oscillator Control Register
}
void main(){
	char i;
	config();
	adc0_ini();//ADC0初始化
	ADC0START;//ADC0啟動(dòng)
	EA=1;
	i=0;
	stack_index=0;
	while(1){
		if(isnewdata){//由該位查詢ADC0轉(zhuǎn)化值是否更新
			if(stack_index==STACK_LEN)
				for(i=0,total=0;i<STACK_LEN;i++)
					total+=stack[i];
			total/=8;//此時(shí)total的值即為16bit精度采樣值
			temp=(float)total/65536.0;
			temp*=2.43;
			temp-=0.776;
			temp/=0.00286;//將測(cè)量值轉(zhuǎn)化成真實(shí)溫度值
			isnewdata=0;
			t[i]=temp;//將溫度檢測(cè)值存入長(zhǎng)度為20的數(shù)組中
			i++;
			if(i>19)
				i=0;//在此設(shè)斷點(diǎn)，觀察程序運(yùn)行結(jié)果
			delay1ms(100);
			ADC0START;
		}
	}
}
void ADC0_ISR() interrupt 15{//ADC0中斷
	SFRPAGE=0x00;
	AD0INT=0;
	isnewdata=1;
	if(stack_index>=STACK_LEN)//STACK_LEN需小于等于256，否則stack_index要定義成uint型數(shù)據(jù)
		stack_index=0;
	stack[stack_index]=ADC0VAL;
	stack_index++;
}