u2270b解调C语言源码已通过

// -------------------------------------- // Function: H4001 64位RFID只读卡读头 // MCU: ATmega32 // Crystal: 7.3728Mhz // Date: 2005/01/16 // -------------------------------------- // Compiler: // ICCAVR 6.28C,6.31A // RFID基站芯片：U2270B // -------------------------------------- #include <iom32v.h> #include <macros.h> //variable definition unsigned char timer_count,error=0,post=0,data1,rxdata,run=0; unsigned char decode[192],head=0,rfiddata[54]; unsigned int tcomp=0; unsigned char lastbit=0,half=0; const unsigned char ascii[16]="0123456789ABCDEF"; //pin definition #define led() (PORTD^=0x80) #define RFW (1<<6) //RFW, RFID输出载波控制 #define RFW_1() (PORTC |=RFW) #define RFW_0() (PORTC &=~RFW) #define beep (1<<4) #define beep_1() (PORTC |=beep) #define beep_0() (PORTC &=~beep) #define okled (1<<0) #define okled1() (PORTC |=okled) #define okled0() (PORTC &=~okled) //RFID_IN U2270B返回卡的未解调码 #define RFID_IN (PINC&0x80) void port_init(void) { PORTA = 0xFF; DDRA = 0x00; PORTB = 0xFF; DDRB = 0x00; PORTC = 0xFF; DDRC = 0x51; PORTD = 0x7F; DDRD = 0x80; } //TIMER0 initialisation - prescale:1024 // WGM: Normal // desired value: 10mSec // actual value: 9.861mSec (1.4%) void timer0_init(void) { TCCR0 = 0x00; //stop TCNT0 = 0xB9; //set count OCR0 = 0x47; //set compare TCCR0 = 0x05; //start timer } #pragma interrupt_handler timer0_ovf_isr:12 void timer0_ovf_isr(void) { TCNT0 = 0xB9; //reload counter value timer_count++; if (timer_count>50) { // 0.01*50=0.5sec,每0.5秒扫描一次是否有ID卡 // led(); timer_count=0; run=1; } } //TIMER1 initialisation - prescale:1 // WGM: 0) Normal, TOP=0xFFFF // desired value: 1Hz // actual value: Out of range void timer1_init(void) { TCCR1B = 0x00; //stop TCNT1H = 0x00 /*INVALID SETTING*/; //setup TCNT1L = 0x00 /*INVALID SETTING*/; OCR1AH = 0x00 /*INVALID SETTING*/; OCR1AL = 0x00 /*INVALID SETTING*/; OCR1BH = 0x00 /*INVALID SETTING*/; OCR1BL = 0x00 /*INVALID SETTING*/; ICR1H = 0x00 /*INVALID SETTING*/; ICR1L = 0x00 /*INVALID SETTING*/; TCCR1A = 0x00; TCCR1B = 0x01; //start Timer } //UART0 initialisation // desired baud rate: 9600 // actual: baud rate:57600 (0.0%) // char size: 8 bit // parity: Disabled void uart0_init(void) //Uart初始化 { UCSRB = 0x00; //disable while setting baud rate UCSRA = 0x00; UCSRC = 0x06; UBRRL = 0x07; //set baud rate lo,9600=0x2F,57600=0x07 UBRRH = 0x00; //set baud rate hi UCSRB = 0x98; } #pragma interrupt_handler uart0_rx_isr:14 void uart0_rx_isr(void) //接收中断处理 { //uart has received a character in UDR rxdata=UDR; } //call this routine to initialise all peripherals void init_devices(void) //初始化 { //stop errant interrupts until set up CLI(); //disable all interrupts port_init(); timer0_init(); timer1_init(); uart0_init(); MCUCR = 0x02; GICR = 0x40; TIMSK = 0x01; //timer interrupt sources SEI(); //re-enable interrupts //all peripherals are now initialised } void ldelay(unsigned int i) //长延时 { while(i--); } void beeps(unsigned char i) { //讯响 while(i--) { beep_0(); ldelay(60000); ldelay(60000); ldelay(60000); beep_1(); ldelay(60000); ldelay(60000); ldelay(60000); } } void wait_tx() { //等待发送完一个字节 while(!(UCSRA&0x40)); UCSRA|=0x40; } void R_H4001() //读卡 { unsigned char i=0,j=0; unsigned int bits=0; data1=0; for (i=0;i<192;i++) { decode[i]=1; } for (i=0;i<64;i++) { rfiddata[i]=0; } RFW_1(); data1=0; lastbit=0; TCNT1=0; half=0; j=0; for (bits=0;bits<256;bits++) { // while (((!(PINC&0x80))==lastbit)& (TCNT1<20000)) { } //low level // while (((!(PINC&0x80))==lastbit)& (TCNT1<20000)) { } while (((!(RFID_IN))==lastbit)& (TCNT1<20000)) { } tcomp=TCNT1; TCNT1=0; if ((tcomp>1500 & tcomp<2500)|(tcomp>3000 & tcomp<5000)) { //判断是否为合法跳变 if (tcomp>1500 & tcomp<2500) { if (half==1) { half=0; decode[j]=lastbit; j++; } else half=1; } else { // (tcomp>3000 & tcomp<5000) if (half==1) { if (lastbit==0) { decode[j]=1; } else { if (lastbit==1) { decode[j]=0; } } } else { decode[j]=0x0E; if (j<127) { bits=0; } else break; } j++; half=1; } } lastbit^=0x01; } j=0; head=0; post=0; error=0; for (i=0;i<128;i++) { //查找最后一个终止位（0），及9位（1）引导位 if ((decode[i]==0)&(decode[i+1]==1)&(decode[i+2]==1)&(decode[i+3]==1)&(decode[i+4]==1)&(decode[i+5]==1)&(decode[i+6]==1)&(decode[i+7]==1)&(decode[i+8]==1)&(decode[i+9]==1)) { head=1; post=i+10; break; } } if (head==1) { for (i=0;i<54;i++) { if (decode[post+i]==0x0e) error++; rfiddata[i]=decode[post+i]; } if (error==0) { //H4001卡采用的二维行列偶校验码 for (i=0;i<10;i++) { //先对10行数据进行校验 if (!(rfiddata[i*5]^rfiddata[i*5+1]^rfiddata[i*5+2]^rfiddata[i*5+3]==rfiddata[i*5+4])) error++; } for (i=0;i<4;i++) { //再对4列数据进行校验 if (!(rfiddata[i]^rfiddata[i+5]^rfiddata[i+10]^rfiddata[i+15]^rfiddata[i+20]^rfiddata[i+25]^rfiddata[i+30]^rfiddata[i+35]^rfiddata[i+40]^rfiddata[i+45]==rfiddata[i+50])) error++; } if (error==0) { beeps(1); UDR=10; wait_tx(); UDR=13; wait_tx(); for (i=0;i<10;i++) { //对10行数据进行校验 data1=(rfiddata[i*5]*8)+(rfiddata[i*5+1]*4)+(rfiddata[i*5+2]*2)+rfiddata[i*5+3]; UDR=ascii[data1%16]; wait_tx(); } } } } } void int0_isr(void) { //external interupt on INT0 } void main(void) { unsigned char i,j,t_i; init_devices(); RFW_1(); okled0(); while (1) { if (run==1) { R_H4001(); led(); run=0; } } } /* H4001卡有关信息，采用曼切斯特编码，125Khz,RF/64,位周期512uS // 激光编程64位ID,前9位头全"1",10位行检验，4位列检验，1个终止位， // 8位CustomID,32位ID信息，即10个十六进制编码 // 一个典型数据 111111111 // CustomID 0 00000 // CustomID F 11111 // 0 00000 // 0 00000 // 4 01001 // A 10100 // D 11011 // E 11101 // 1 00011 // 9 10010 // 10100 */