ds18b20温度练习
一、操作流程

二、数据相关处理

三、代码实现
在编写代码过程中会给出相关驱动程序,所以我们只需掌握
如何更具现有的驱动来实现我们的功能,当然在给出的驱动
代码中也可能会设计一些小细节需要我们自己去修改或者添加
譬如(没有在头文件中添加函数声明、没有定义相关引脚)等等
#include "reg52.h"
#include "absacc.h"
#include "onewire.h"
unsigned char temp = 0x00;
unsigned char code SMG_Duan[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,
0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xbf};
unsigned char code distab[] = {0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,
0x00,0x10,0x08,0x03,0x46,0x21,0x06,0x0e};
void Delay(unsigned int t)
{
while(t--);
}
void Init_74HC138(unsigned char n)
{
switch(n)
{
case 4:P2 = (P2 | 0x1f) ; P2 = 0x80; break;
case 5:P2 = (P2 | 0x1f) ; P2 = 0xa0; break;
case 6:P2 = (P2 | 0x1f) ; P2 = 0xc0; break;
case 7:P2 = (P2 | 0x1f) ; P2 = 0xe0; break;
}
}
void InitSystem(void)
{
Init_74HC138(5);
P0 = 0x00;
Init_74HC138(4);
P0 = 0xff;
}
void SMG_DisplayBit(unsigned char pos ,unsigned char dat)
{
Init_74HC138(6);
P0 = 0x01 << pos;
Init_74HC138(7);
P0 = dat;
}
void SMG_CLOSEALL(unsigned char dat)
{
Init_74HC138(6);
P0 = 0xff;
Init_74HC138(7);
P0 = dat;
}
void SMG_DisplayDat(void)
{
SMG_DisplayBit(5,SMG_Duan[temp/100]);
Delay(200);
SMG_DisplayBit(6,SMG_Duan[temp/10%10]);
Delay(200);
SMG_DisplayBit(7,SMG_Duan[temp%10]);
Delay(200);
SMG_DisplayBit(0,0xff);
Delay(200);
SMG_DisplayBit(1,0xff);
Delay(200);
SMG_DisplayBit(2,0xff);
Delay(200);
SMG_DisplayBit(3,0xff);
Delay(200);
SMG_DisplayBit(4,0xff);
Delay(200);
SMG_CLOSEALL(0xff);
Delay(200);
}
void SMG_Delay(unsigned int t)
{
while(t--)
{
SMG_DisplayDat();
}
}
void Temp_Tackle(void)
{
unsigned char LSB ,MSB;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
SMG_Delay(800);
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
LSB = Read_DS18B20();
MSB = Read_DS18B20();
temp = MSB;
temp = (temp << 8) | LSB;
temp = temp >> 4;
}
void main(void)
{
InitSystem();
while(1)
{
Temp_Tackle();
SMG_DisplayDat();
}
}
在本次学习中,掌握了对ds18b20的基础使用在听老师讲解过程中才发现其实实现温度采集并不难,不过还是希望自己可以去掌握驱动代码的编写,虽然会提供但在学习中我们更应该知其所有然。