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基于AT89C51、DS18B20温度传感器的电锅炉温度控制系统设计
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你可能喜欢ds18b20做的温度计（共阴四位数码管）
#include&reg52.h&
#define& uchar& unsigned
sbit DQ=P3^7;
uchar data&&&
temp_data[2]={0x00,0x00};
uchar data&&&
display[5]={0x00,0x00,0x00,0x00,0x00};
unsigned char code& ditab[16]
={0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x04,
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
0x05,0x06,0x06,0x07,0x08,0x08,0x09,0x09} ;
//共阴数码管
uchar code table[11]
={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};//&0,1,2,3,4,5
，6,7,8,9,百位或当最高位十位为0时不显示
uchar code table1[10]=
{0xcf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};//
0.，1.，2.，3.，4.，5.，6.，7.，8.，9.各位带有小数点的显示
void delay_18b20(unsigned int i)
while(i--);
//初始化函数
Init_DS18B20(void)
unsigned char x=0;
delay_18b20(8);&& //稍做延时
//单片机将DQ拉低
delay_18b20(80); &//精确延时 大于 480us
//拉高总线
delay_18b20(14);
x=DQ;&&&&&&
//稍做延时后 如果x=0则初始化成功 x=1则初始化失败
delay_18b20(20);
ReadOneChar(void)
unsigned char i = 0 ;
unsigned char dat = 0 ;
for (i = 8 ; i & 0 ; i--)
DQ = 0 ; // 给脉冲信号
dat &&= 1 ;
DQ = 1 ; // 给脉冲信号
dat |= 0x80 ;
delay_18b20(4) ;
return (dat) ;
WriteOneChar(unsigned char dat)
&&& unsigned
char i = 0 ;
&&& for (i = 8 ;
i & 0 ; i--)
DQ = dat&0x01 ;
delay_18b20(5) ;
Read_Temperature(void)
Init_DS18B20() ;
WriteOneChar(0xCC)
跳过读序号列号的操作
WriteOneChar(0x44)
启动温度转换
Init_DS18B20() ;
WriteOneChar(0xCC)
//跳过读序号列号的操作
WriteOneChar(0xBE)
//读取温度寄存器&
temp_data[0] = ReadOneChar()
//温度低8位
temp_data[1] = ReadOneChar()
//温度高8位
Disp_Temperature()
display[4]=temp_data[0]&0x0
display[0]=ditab[display[4]]
//查表得小数位的值
display[4]=((temp_data[0]&0xf0)&&4)|((temp_data[1]&0x0f)&&4)
display[3]=display[4]/100 ;
display[1]=display[4]%100 ;
display[2]=display[1]/10;
display[1]=display[1]%10;
if(display[3]==0)&&&&&&&&&
//高位为0，不显示
display[3]=10
;&&&&&&&&&&&&&
if(display[2]==0)&&&&&&&
//次高位为0，不显示
display[2]=10 ;
void main()
&& while(1)
Read_Temperature();
&& Disp_Temperature();
P2=0xf7;&&&&&&&&&&&&&&&&&&&&
//P2口低四位位选
P0=table[display[3]];&&&&&&&
//P0口数码管段选
&& delay_18b20(50);
&&&&&&&&&&
P0=table[display[2]];
&& delay_18b20(50);
&&&&&&&&&&
P0=table1[display[1]];
delay_18b20(50);
&&&&&&&&&&
P0=table[display[0]];
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&1.& ,NIOSII examples of code. Including the system clock source, DMA (Memory to Memory) drive code, Fine-gained Flash Access driver code, Timestamp-driven code, ISR code, Simple Flash Access driver code, UART code,8KB,downloads 28&2.& ,Collected online using Nios soft-core, use isp1362 chip development process u disk, usb help develop the understanding and agreement ufi understanding. Has been verified, fully available to bring their own driver xp.,15KB,downloads 88&3.& ,The MSP430 with the use of the Nios FPGA connected to the FPGA as the MSP430 JTAG to use. Which used the Nios multiple interfaces and dma operation,55KB,downloads 26&4.& ,Related to the VHDL SPI realize. Including SPI official agreement, when used to develop several theses, Chinese notes attached SPI IPcore, there is a simplified master mode the SPI realize the VHDL code,1303KB,downloads <font color=#FF
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