DS18B20

基础知识

代码流程实现

将官方提供例程文件添加到工程中


添加onewire.c文件到keil4里面

一些代码补充知识

代码

#include "reg52.h"
#include "onewire.h"
#include "absacc.h"
unsigned char num[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //0-9
unsigned char num2[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//0-9unsigned int temp = 0;void DelaySMG(unsigned int t)
{while(t--);
}
void DisPlaySMG_Bit(unsigned pos, unsigned char dat)
{XBYTE[0xE000] = 0xff;XBYTE[0xC000] = 0x01 << pos;XBYTE[0xE000] = dat;}
void DisPlay_All(unsigned char dat)
{XBYTE[0xC000] = 0xff;XBYTE[0xE000] = dat;
}void DisPlaySMG_Temp()
{DisPlaySMG_Bit(7, num[(temp % 10)]);DelaySMG(100);DisPlaySMG_Bit(6, num2[(temp % 100) / 10]);DelaySMG(100);DisPlaySMG_Bit(5, num[temp / 100]);DelaySMG(100);DisPlaySMG_Bit(4, 0xff);DelaySMG(100);DisPlaySMG_Bit(3, 0xff);DelaySMG(100);DisPlaySMG_Bit(2, 0xff);DelaySMG(100);DisPlaySMG_Bit(1, 0xff);DelaySMG(100);DisPlaySMG_Bit(0, 0xff);DelaySMG(100);DisPlay_All(0xff);}
void Delay(unsigned int t)
{while(t--){DisPlaySMG_Temp();}}
void Read_DS18B20_temp()
{unsigned char LSB,MSB;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){// °ÑСÊýÒÆ×ßtemp >>= 4;temp = temp*10;temp = temp + (LSB & 0x0f)*0.625;}}
void main()
{XBYTE[8000] = 0xff;while(1){Read_DS18B20_temp();DisPlaySMG_Temp();}}