DS1621溫度傳感器仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
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2018-12-14 03:30 上傳
單片機源程序如下:
- /*************** writer:shopping.w ******************/
- #include <reg52.h>
- #include <intrins.h>
- #define uint unsigned int
- #define uchar unsigned char
- bit I2C_Busy, NO_Ack,Bus_Fault,point;
- uchar bdata a;
- sbit LSB = a^0;
- sbit MSB = a^7;
- sbit SDA = P3^3;
- sbit SCL = P3^2;
- uchar Array[] = {'0','1','2','3','4','5','6','7','8','9'};
- uchar command_data[]=
- {
- 0xac,0x00,0xee,0xa1,0x00,0x00,0xa2,0x00,0x00,0xaa
- };
- uchar Prompt[]="Waiting for a while...\r";
- uchar i;
- void DelayMS(uint ms)
- {
- uchar i;
- while(ms--)
- {
- for(i=0;i<120;i++);
- }
- }
- void SendStop()
- {
- SDA = 0;
- SCL = 1;
- _nop_();
- SDA = 1;
- I2C_Busy = 0;
- }
- void SendByte(uchar wd)
- {
- uchar i;
- a = wd;
- for(i=0;i<8;i++)
- {
- SCL = 0;
- _nop_();
- _nop_();
- SDA = MSB;
- a <<= 1;
- _nop_();
- _nop_();
- SCL = 1;
- _nop_();
- _nop_();
- SCL = 0;
- }
- SDA = 1;
- SCL = 1;
- _nop_();
- _nop_();
- if(!SDA)
- {
- SCL = 0;
- _nop_();
- _nop_();
- }
- else
- {
- NO_Ack = 1;
- SCL = 0;
- _nop_();
- _nop_();
- }
- }
- void Master(uchar slave_addr)
- {
- I2C_Busy = 1;
- NO_Ack = 0;
- Bus_Fault = 0;
- if(!SCL || !SDA)
- Bus_Fault = 1;
- else
- {
- SDA = 0;
- _nop_();
- _nop_();
- SCL = 0;
- _nop_();
- _nop_();
- SendByte(slave_addr);
- }
- }
- uchar RecvByte(uchar cnt)
- {
- uchar i,rcv_data;
- for(i=0;i<8;i++)
- {
- SDA = 1;
- SCL = 1;
- _nop_();
- LSB = SDA;
- if(i<7)
- a <<= 1;
- _nop_();
- SCL = 0;
- _nop_();
- }
-
- if(cnt == 1)
- SDA = 1;
- else
- SDA = 0;
- SCL = 1;
- _nop_();
- SCL = 0;
- SDA = 1;
- _nop_();
- rcv_data = a;
- return rcv_data;
- }
- void SendData(uchar slave_address,uchar start,uchar end)
- {
- Master(slave_address);
- for(i=start;i<=end;i++)
- SendByte(command_data[i]);
- SendStop();
- }
- void InitialiseSerialPort()
- {
- TMOD = 0x20;
- TH1 = 0xfd;
- SCON = 0x50;
- TR1 = 1;
- }
- void SendCharToSerialPort(uchar ch)
- {
- SBUF = ch;
- while(!TI);
- TI = 0;
- }
- void SendTemperatureToSerialPort(uchar val)
- {
- if(val>200)
- {
- val = 255-val;
- SendCharToSerialPort('-');
- if(!point)
- val+=1;
- }
- SendCharToSerialPort(Array[(val/10)/10]);
- SendCharToSerialPort(Array[(val/10)%10]);
- SendCharToSerialPort(Array[val%10]);
- SendCharToSerialPort('.');
- if(point)
- SendCharToSerialPort('5');
- else
- SendCharToSerialPort('0');
- SendCharToSerialPort(' ');
- SendCharToSerialPort('C');
- SendCharToSerialPort('\r');
- }
- void SetTemperatureLimit(uchar HI,uchar LO)
- {
- command_data[4] = HI;
- command_data[5] = 0;
- command_data[7] = LO;
- command_data[8] = 0;
- SendData(0x90,3,5);
- DelayMS(10);
- SendData(0x90,6,8);
- }
- void StartConversion()
- {
- SendData(0x90,2,2);
- DelayMS(750);
- }
- uchar ReadTemp()
- {
- uchar d;
- SendData(0x90,9,9);
- Master(0x91);
- d = RecvByte(0);
- point = RecvByte(1)>>7;
- SendStop();
- return d;
- }
- void WriteConfig(uchar c)
- {
- command_data[1] = c;
- SendData(0x90,0,1);
- }
- void main()
- {
- uchar i;
- InitialiseSerialPort();
- while(Prompt[i]!='\0')
- SendCharToSerialPort(Prompt[i++]);
- WriteConfig(0x02);
- StartConversion();
- SetTemperatureLimit(40,35);
- while(1)
- {
- DelayMS(50);
- SendTemperatureToSerialPort(ReadTemp());
- }
- }
所有資料51hei提供下載:
溫度傳感器實驗（DS1621）.rar
(40.67 KB, 下載次數: 78)
2018-12-13 11:41 上傳
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