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介紹了一種RFID射頻識別系統的設計與實現[1]。該設計采用低頻125KHz傳輸信號，射頻卡選用EM4001，發射和接收信號采用集成模塊U2270B，信號的編碼和解碼采用曼徹斯特編碼，主控模塊采用STC89C51。經驗證，該設計滿足門禁系統的要求。
單片機源程序如下:
- #include<reg51.h>
- #include"lcd.h"
- #include"timer.h"
- #include"usart.h"
- #include"EM40xx.h"
- #include"SoundPlay.h"
- sbit CFE=P1^0;
- sbit Output=P1^1;
- sbit MS=P1^2;
- sbit OE=P1^3;
- sbit LED=P1^6;
- unsigned long number=0;
- unsigned long number_l=0;
- unsigned long lastnumber=0;
- unsigned char number_char[10];
- unsigned char success[]="success!";
- unsigned char nothing[]="failure!";
- unsigned char ID[]="ID:";
- void Delay10ms(unsigned int c);
- void BZ_WORK();
- void main(void)
- {
- char i;
- CFE=1;
- OE=0;
- MS=1;
- BZ=0;
- TIME_Init();
- LcdInit();
- UsartConfiguration();
- while(1)
- {
- number=halReadEm40xxCard();
- number_l=number;
- for(i=9;i>=0;i--)
- {
- number_char[i]=number%10+'0';
- number=number/10;
- }
- LcdWriteCom(0x80);
- if(number_l!=0)
- {
- for(i=0;i<8;i++)
- {
- LcdWriteData(success[i]);
- }
- }
- else
- {
- for(i=0;i<8;i++)
- {
- LcdWriteData(nothing[i]);
- }
- }
- LcdWriteCom(0xC0);
- for(i=0;i<3;i++)
- {
- LcdWriteData(ID[i]);
- }
- for(i=0;i<10;i++)
- {
- LcdWriteData(number_char[i]);
- }
- if(number_l!=0&&number_l!=lastnumber)
- {
- ……………………
- …………限于本文篇幅 余下代碼請從51黑下載附件…………
所有資料51hei提供下載:
125KHz RFID-源碼 -學生.rar
(75.74 KB, 下載次數: 188)
2017-9-19 19:16 上傳
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