蓝桥杯第十一届我在读温度的时候,读出来显示在数码管上的是07,而不是27,为什么啊?
main.c
#include<STC15F2K60S2.H>
#include"hardware.h"
#include"onewire.h"
bit mode=0;//S4切换
unsigned char Tmax=30;
unsigned char Tmin=20;
unsigned char temp=0;
//---------------------------------------------------------------------
void Workingkey()
{
if(timer10ms>=10)
{
timer10ms=0;
Scankey();
if(key_value==4 && key_stat==2)
{
mode=~mode;
}
}
}
//---------------------------------------------------------------------
void SMG_display()
{
if(mode==0)//数据显示
{
SMG_buf[0]=12;
SMG_buf[1]=16;
SMG_buf[2]=16;
SMG_buf[3]=16;
SMG_buf[4]=16;
SMG_buf[5]=16;
SMG_buf[6]=temp/10;
SMG_buf[7]=temp%10;
}
else if(mode==1)
{
SMG_buf[0]=24;
SMG_buf[1]=16;
SMG_buf[2]=16;
SMG_buf[3]=Tmax/10;
SMG_buf[4]=Tmax%10;
SMG_buf[5]=16;
SMG_buf[6]=Tmin/10;
SMG_buf[7]=Tmin%10;
}
}
//---------------------------------------------------------------------
void Delay(unsigned int t)
{
while(t--);
}
//---------------------------------------------------------------------
void Read_temp()
{
unsigned char MSB,LSB;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
Delay(1000);
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
LSB=Read_DS18B20();
MSB=Read_DS18B20();
temp=MSB;
temp=(temp<<8)|LSB;
if((temp&0xf800)==0x0000)
{
temp>>=4;
}
else if((temp & 0xf800)==0xf800)
{
temp=(~temp+1)&0x07ff;
temp>>=4;
}
}
//---------------------------------------------------------------------
void main()
{
led_output();
ws_output();
Timer1Init();
Read_temp();
while(1)
{
Workingkey();
SMG_display();
if(timer400ms>=400)
{
timer400ms=0;
Read_temp();
}
}
}
hardware.c
#include<STC15F2K60S2.H>
#include"hardware.h"
/************* 本地常量声明 **************/
unsigned char code t_display[]={ //标准字库
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black - H J K L N o P U t G Q r M y
0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46}; //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1
unsigned char code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; //位码
unsigned char led_buf=0xff;
unsigned char ws_buf=0x00;
unsigned char SMG_buf[]={16,16,16,16,16,16,16,16};
unsigned int timer10ms=0;
unsigned int timer10ms2=0;
unsigned int timer400ms=0;
unsigned char key_stat=0;
unsigned char key_value=0;
//----------------------------------------------------------------------
void Timer1Init() //1毫秒@12.000MHz
{
AUXR |= 0x40; //定时器时钟1T模式
TMOD &= 0x0F; //设置定时器模式
TL1 = 0x20; //设置定时初值
TH1 = 0xD1; //设置定时初值
TF1 = 0; //清除TF1标志
TR1 = 1; //定时器1开始计时
ET1=1;
EA=1;
}
//---------------------------------------------------------------------
void SelectHC573(unsigned char channel)
{
switch(channel)
{
case 4:
P2=(P2 & 0x1f)|0x80;
break;
case 5:
P2=(P2 & 0x1f)|0xa0;
break;
case 6:
P2=(P2 & 0x1f)|0xc0;
break;
case 7:
P2=(P2 & 0x1f)|0xe0;
break;
case 0:
P2=(P2 & 0x1f)|0x00;
break;
}
}
//---------------------------------------------------------------------
void led_output()
{
P0=led_buf;
SelectHC573(4);
SelectHC573(0);
}
//---------------------------------------------------------------------
void ws_output()
{
P0=ws_buf;
SelectHC573(5);
SelectHC573(0);
}
//---------------------------------------------------------------------
void SMG_output()
{
static unsigned char SMG_com=0;
P0=0x00;
SelectHC573(6);
SelectHC573(0);
P0=T_COM[SMG_com];
SelectHC573(6);
SelectHC573(0);
P0=~t_display[SMG_buf[SMG_com]];
SelectHC573(7);
SelectHC573(0);
if(++SMG_com>=8)
{
SMG_com=0;
}
}
//---------------------------------------------------------------------
void ServiceTimer()interrupt 3
{
SMG_output();
timer10ms++;
timer10ms2++;
timer400ms++;
}
//----------------------------------------------------------------------
//----------------------------------------------------------------------
void Scankey()
{
P3|=0x0f;
if(~P3&0x0f)
{
if(key_stat<255)
key_stat++;
if(P33==0)
key_value=4;
if(P32==0)
key_value=5;
if(P31==0)
key_value=6;
if(P30==0)
key_value=7;
}
else
{
key_stat=0;
key_value=0;
}
}
onewire.c
#include<STC15F2K60S2.H>
#include "onewire.h"
sbit DQ=P1^4;
//
void Delay_OneWire(unsigned int t)
{
unsigned char i;
while(t--){
for(i=0;i<12;i++);
}
}
//
void Write_DS18B20(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
DQ = 0;
DQ = dat&0x01;
Delay_OneWire(5);
DQ = 1;
dat >>= 1;
}
Delay_OneWire(5);
}
//
unsigned char Read_DS18B20(void)
{
unsigned char i;
unsigned char dat;
for(i=0;i<8;i++)
{
DQ = 0;
dat >>= 1;
DQ = 1;
if(DQ)
{
dat |= 0x80;
}
Delay_OneWire(5);
}
return dat;
}
//
bit init_ds18b20(void)//延时需要自己扩大12倍!!!!!!!!!!!!!!!!
{
bit initflag = 0;
DQ = 1;
Delay_OneWire(144);
DQ = 0;
Delay_OneWire(960);
DQ = 1;
Delay_OneWire(120);
initflag = DQ;
Delay_OneWire(60);
return initflag;
}