21006541读取磁卡数据

c=1;
longDelay();
c=0;
longDelay();
c=1;
longDelay();
c=0;
longDelay();
while ((i & 1) == 1) {
i = P0;
}
}
//磁道B译码磁道B的编码和磁道A相似，只是采用了5位(4位数据和1位奇偶校验位)编码，而不是7位编码。
//磁道B的字符集只含有数字字符和符号，如下面的char5bit[16]字符阵列所示。 0123456789012345
char char5bit[16] = "0123456789:;<=>?";
// beginning with the least significant bit. Bit 7 is parity, which is ignored.
c = 0;
for (i = 1; i < 128; i *= 2) {
c |= (readBit() * i);
strobeLow();
}
// Wait for the DATA line to be driven low by the card reader.
void waitForDataLow()
{
int i = 0xFF;
dataHigh(); // Make sure that DATA is floating high.
}
c &= 0x3F;
return char7bit[c]; // Decode/return the character using the 7-bit table.
}
// Clock out and decode a 5-bit character from the track memory, returning the
// character value. 5-bit (numeric+symbol) characters are found on Tracks B and C.
char read5BitChar()
{
int i, c;
// Each character is composed of 5 bits, which we clock out of the track memory
// Track A - 76 characters, 7 bits per alphanumberic character including parity.
char char7bit[64] =
" !'#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";
}
c &= 0x0F;
return char5bit[c]; // Decode/return the character using the 5-bit table.
}
void UART_init()
{
TL1 = (65536-50000)%256; // 得到定时器寄存器低位
} else {
return 0; // High on DATA line indicates a 0 bit.
}
}
//译码A***********************************************
// Clock out and decode a 7-bit character from the track memory, returning the
{
P0 &= 0xFE;
delay();
}
// Release the STROBE line (P0.1) and allow it to float high.
void strobeHigh()
{
P0 |= 0x02;
delay();
}
// Clock a single bit value out of the card reader by driving STROBE high,
// then low, and reading the DATA line.
int readBit()
{
int i;
strobeHigh(); // Drive STROBE high.
strobeLow(); // Drive STROBE low (DATA line now contains bit).
i = P0;
if ((i & 1) == 0) {
return 1; // Low on DATA line indicates a 1 bit.
strobeLow(); // Drive STROBE low, then release DATA.
dataHigh();
longDelay();
strobeHigh(); // Drive STROBE low and high again two more times
}
// Release the DATA line (P0.0) and allow it to float high.
void dataHigh()
{
P0 |= 0x01;
delay();
}
// Drive the DATA line (P0.0) low.
void dataLow()
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit b=P0^4;
sbit c=P0^3;
uchar z, count;
uchar String[20];
//xdata uchar ryubCardMsg[MSR_ASIC_PREAMBLE_AND_ALL_3_TKACKS_LEN_IN_BYTES];
TH1 =0xfA; //实现波特率9600（系统时钟11.0592MHZ）
PCON = 0x80;
TR1 =1; //启动定时器T1
ET1 =1;
ES=1; //允许串行口中断
PS=1; //设计串行口中断优先级
dataLow(); // Force DATA low.
longDelay();
strobeLow(); // Drive STROBE low, then high again.
strobeHigh();
strobeLow(); // to complete the reset and leave the card reader
strobeHigh(); // in the ready state, prepared to scan a card.
// beginning with the least significant bit. Bit 5 is parity, which is ignored.
c = 0;
for (i = 1; i < 32; i *= 2) {
c |= (readBit() * i);
}
}
// Generate a shorter delay (used between STROBE/DATA transitions).
void delay()
{
uint i;
for (i = 1; i < 1000; i++) {
;
}
TH1 = (65536-50000)/256; // 得到定时器寄存器高位
//初始化串行口和波特率发生器
SCON =0x50; //选择串口工作方式1，打开接收允许
TMOD =0x20; //定时器1工作在方式2，定时器0工作在方式1
{
for(;len>0;len--) SendOneByte(*string++);
SendOneByte(0x0d);
}
//*****************************************************
void main()
{
uint i;
// character value. 7-bit (alphanumeric) characters are found on Track A only.
char readБайду номын сангаасBitChar()
{
int i, c;
// Each character is composed of 7 bits, which we clock out of the track memory
// Generate a long delay for card reset and read intervals.
void longDelay()
{
uint j, i=5;
while(i--)
{
for(j = 0; j < 5000; j++);
P0=0X00;
UART_init();
while(1)
{
resetCardReader();
UartPrint(24,"Waiting for card swipe :");