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};//0-9

unsigned 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×ß
		temp >>= 4;
		temp = temp*10;
		temp = temp + (LSB & 0x0f)*0.625;
		
		

  }
	
	  
}
void main()
{
	XBYTE[8000] = 0xff;
	while(1)
	{
		Read_DS18B20_temp();
		DisPlaySMG_Temp();
		
	}

}