熱敏電阻3950的測溫單片機里程序
code uint VOL[]和code uint Temper[]中的數據是怎么計算查表得到的。
result=(uint)((res/2048.0-1.0)*500.0);
temp1=abs(result-VOL[0]);
for(i=1;i<150;i++)
{
temp2=abs(result-VOL);
if(temp1>=temp2)
{
temp1=temp2;
flag=i;
}
這一段程序是什么意思呢？
:#include <reg52.h>
#include <intrins.h>
#include <math.h>
typedef unsigned char uchar;
typedef unsigned int uint;
code uint VOL[]={ 343, 339, 339, 335, 332, 332, 328, 324, 320, 320,
316, 312, 312, 308, 304, 300, 300, 296, 292, 292,
289, 285, 285, 281, 277, 273, 273, 269, 265, 265,
261, 257, 257, 253, 250, 250, 246, 242, 242, 238,
234, 234, 230, 230, 226, 222, 222, 218, 218, 214,
210, 210, 207, 207, 203, 199, 199, 195, 195, 191,
191, 187, 187, 183, 179, 179, 175, 175, 171, 171,
167, 167, 164, 164, 160, 160, 160, 156, 156, 152,
152, 148, 148, 144, 144, 140, 140, 140, 136, 136,
132, 132, 132, 128, 128, 125, 125, 125, 121, 121,
121, 117, 113, 109, 109, 105, 101, 101, 97, 97,
93, 89, 89, 85, 85, 82, 82, 78, 78, 74,
74, 70, 70, 66, 66, 66, 62, 62, 58, 58,
58, 54, 54, 54, 50, 50, 50, 46, 46, 46,
42, 42, 42, 42, 39, 39, 39, 39, 35, 35};
code uint Temper[]={ 100, 150, 200, 250, 300, 350, 400, 450, 500, 550,
600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050,
1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550
1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050,
2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450, 2500, 2550,
2600, 2650, 2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050,
3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450, 3500, 3550,
3600, 3650, 3700, 3750, 3800, 3850, 3900, 3950, 4000, 4050,
4100, 4150, 4200, 4250, 4300, 4350, 4400, 4450, 4500, 4550,
4600, 4650, 4700, 4750, 4800, 4850, 4900, 4950, 5000, 5050,
5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000,
6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900, 7000,
7100, 7200, 7300, 7400, 7500, 7600, 7700, 7800, 7900, 8000,
8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 8900, 9000,
9100, 9200, 9300, 9400, 9500, 9600, 9700, 9800, 9900, 10000};
sbit STS=P1^0;
sbit CE = P1^1;
sbit CS=P1^2;
sbit A0=P1^3;
sbit RC=P1^4;
sbit RS=P1^5 ;
sbit RW=P1^6 ;
sbit EN=P1^7 ;
void delay_ms(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uint AD1674_Read(void)
{
uint temp;
uchar temp1,temp2;
CS=1; //片選信號
CE=0; //初始化，關閉數據采集
CS=0;
A0=0;
RC=0;
CE=1;//CE=1,CS=0,RC=0,A0=0啟動12位溫度轉換
_nop_();
while(STS==1); //等待數據采集結束
CE=0; //芯片使能關閉
RC=1;
A0=0;
CE=1;//CE=1,CS=0,RC=1,12/8=1,A0=0 允許高八位數據并行輸出
_nop_();
temp1=P0; //讀取轉換結果的高八位
CE=0; //芯片使能關閉
RC=1;
A0=1;
CE=1;//CE=1,CS=0,RC=1,12/8=0,A0=1 允許低四位數據 并行輸出
_nop_();
temp2=P0; //讀取轉換結果的第四位
temp=((temp1<<4)|(temp2&0X0F)); //高位和低位合成實際溫度，temp2為PO口的高四位
return (temp); //還回轉換結果，右移四位是因為temp2為P0口的高四位
}
/*** 寫數據***/
void w_dat(unsigned char dat)
{
RS = 1;
//EN = 0;
P2 = dat;
delay_ms(5);
RW = 0;
EN = 1;
EN = 0;
}
/*** 寫命令***/
void w_cmd(unsigned char cmd)
{
RS = 0;
// EN = 0;
P2 = cmd;
delay_ms(5);
RW = 0;
EN = 1;
EN = 0;
}
/*** 發(fā)送字符串到LCD***/
void w_string(unsigned char addr_start, unsigned char *p)
{
unsigned char *pp;
pp = p;
w_cmd(addr_start);
while (*pp != '\0')
{
w_dat(*pp++);
}
}
/*** 初始化1602****/
void Init_LCD1602(void)
{
EN = 0;
w_cmd(0x38); // 16*2顯示，5*7點陣，8位數據接口
w_cmd(0x0C); // 顯示器開、光標開、光標允許閃爍
w_cmd(0x06); // 文字不動，光標自動右移
w_cmd(0x01); // 清屏
}
void process(uint date,uchar add)
{
uchar A[7];
A[0]=date/1000%10+'0';
A[1]=date/100%10+'0';
A[2]='.';
A[3]=date/10%10+'0';
A[4]=date%10+'0';
A[5]='C';
w_string(add,A);
}
void main()
{
uchar i,flag=0;
uint result,temp1,temp2;
float res;
Init_LCD1602();
w_string(0x80,"Temper:");
while (1)
{
res=(float)(AD1674_Read());
result=(uint)((res/2048.0-1.0)*500.0);
temp1=abs(result-VOL[0]);
for(i=1;i<150;i++)
{
temp2=abs(result-VOL);
if(temp1>=temp2)
{
temp1=temp2;
flag=i;
}
}
process(Temper[flag],0x80+7);
} |
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