热敏电阻3950的测温单片机里程序
code uint VOL[]和code uint Temper[]中的数据是怎么计算查表得到的。
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;
}
这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; //片选信号
CE=0; //初始化，关闭数据采集
CS=0;
A0=0;
RC=0;
CE=1;//CE=1,CS=0,RC=0,A0=0启动12位温度转换
_nop_();
while(STS==1); //等待数据采集结束
CE=0; //芯片使能关闭
RC=1;
A0=0;
CE=1;//CE=1,CS=0,RC=1,12/8=1,A0=0 允许高八位数据并行输出
_nop_();
temp1=P0; //读取转换结果的高八位
CE=0; //芯片使能关闭
RC=1;
A0=1;
CE=1;//CE=1,CS=0,RC=1,12/8=0,A0=1 允许低四位数据 并行输出
_nop_();
temp2=P0; //读取转换结果的第四位
temp=((temp1<<4)|(temp2&0X0F)); //高位和低位合成实际温度，temp2为PO口的高四位
return (temp); //还回转换结果，右移四位是因为temp2为P0口的高四位
}
/*** 写数据***/
void w_dat(unsigned char dat)
{
RS = 1;
//EN = 0;
P2 = dat;
delay_ms(5);
RW = 0;
EN = 1;
EN = 0;
}
/*** 写命令***/
void w_cmd(unsigned char cmd)
{
RS = 0;
// EN = 0;
P2 = cmd;
delay_ms(5);
RW = 0;
EN = 1;
EN = 0;
}
/*** 发送字符串到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显示，5*7点阵，8位数据接口
w_cmd(0x0C); // 显示器开、光标开、光标允许闪烁
w_cmd(0x06); // 文字不动，光标自动右移
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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