c|韦根协议-C编程实现 c|协议

一. 韦根协议介绍定义
Wiegand（韦根）协议是由摩托罗拉公司制定的一种通讯协议，它适用于涉及门禁控制系统的读卡器和卡片的许多特性，其协议并没有定义通讯的波特率、也没有定义数据长度韦根格式主要定义是数据传输方式：Data0和Data1两根数据线分别传输0和1，现在应用最多的是26bit，34bit，36bit，44bit等等，其中标准26-bit 格式是一个开放式的格式，任何人都可以购买某一特定格式的HID卡，并且这些特定格式的种类是公开可选的，26-Bit格式就是一个广泛使用的工业标准，并且对所有HID的用户开放，现在几乎所有的门禁控制系统都接受26-Bit格式的标准。
时序
【c|韦根协议-C编程实现】根数据输出由二根线组成，分别是DATA0 和 DATA1 ；二根线分别为‘0’或‘1’输出。
输出‘0’时：DATA0线上出现负脉冲；
输出‘1’时：DATA1线上出现负脉冲；
负脉冲宽度TP=100微秒；周期TW=1600微秒；
韦根26输出格式：
bit0为bit1~bit12的偶校验[1]
bit1~bit24为3字节卡号信息
bit25为bit13~bit24的奇校验

[1]通常专门设置一个奇偶校验位，用它使这组代码中“1”的个数为奇数或偶数

二. 韦根协议编程韦根协议接收
韦根的数据线：一个专门发送0，一个专门发送1。用两个IO端口来接收韦根数据，两个IO都用中断方式来接收数据。代码入下：

volatile long reader = 0; volatile int readerCount = 0; long sign = 0xff0000; void readerOne(void) { readerCount++; reader = reader << 1; reader |= 1; }void readerZero(void) { readerCount++; reader = reader << 1; }void setup() { Serial.begin(9600); attachInterrupt(3, readerZero, RISING); attachInterrupt(2, readerOne, RISING); delay(10); reader = 0; readerCount = 0; }void loop() { if(readerCount >=26) { Serial.print(" Reader:"); Serial.print(reader); Serial.println(""); reader = reader & 0x1fffffe; reader = reader >> 1; long hid = reader & sign; hid = hid >> 16; hid = hid * 256 * 256; sign = sign >> 8; long pid1 = reader & sign; pid1 = pid1 >> 8; pid1 = pid1 * 256; sign = sign >> 8; long pid2 = reader & sign; sign = 0xff0000; long value = https://www.it610.com/article/hid + pid1 + pid2; Serial.println( value); reader = 0, readerCount = 0; hid = 0, pid1 = 0, pid2 = 0, value = 0; } }

韦根协议26发送

发送偶校验位bit0
发送bit1~bit24 总共3字节卡号信息
发送bit25为bit13~bit24的奇校验

容易理解代码：http://blog.sina.com.cn/s/blog_4bb1137401010426.html
奇偶校验算法：https://www.cnblogs.com/Yogurshine/p/3949723.html
百度：https://baike.baidu.com/item/%E9%9F%A6%E6%A0%B9%E5%8D%8F%E8%AE%AE/9914978?fr=aladdin

void Send_Weigand26(unsigned char *str) { unsigned char one_num = 0; unsigned char even = 0; unsigned char odd = 0; unsigned char check_temp,i; check_temp = *str; for(i = 0; i < 8; i++) { if(check_temp & 0x01) one_num++; check_temp >>= 1; } check_temp = *(str + 1); for(i = 0; i < 4; i++) { if(check_temp & 0x80) one_num++; check_temp <<= 1; } if(one_num % 2 ) even = 1; else even = 0; one_num = 0; check_temp = *(str + 1); for(i = 0; i < 4; i++) { if(check_temp & 0x01) one_num++; check_temp >>= 1; } check_temp = *(str + 2); for(i = 0; i < 8; i++) { if(check_temp & 0x01) one_num++; check_temp >>= 1; } if(one_num % 2 ) odd = 0; else odd = 1; one_num = 0; WG_DATA0 = 1; WG_DATA1 = 1; Delay_1ms(2); if(even) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } Delay_1ms(2); for(i = 0; i < 24; i++) { WG_DATA0 = 1; WG_DATA1 = 1; if(str[0] & 0x80) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } (*(long*)&str[0]) <<= 1; Delay_1ms(2); } WG_DATA0 = 1; WG_DATA1 = 1; if(odd) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } Delay_1ms(2); }void Send_Weigand34(unsigned char *str) { unsigned char one_num = 0; unsigned char even = 0; unsigned char odd = 0; unsigned char check_temp,i; check_temp = *str; for(i = 0; i < 8; i++) { if(check_temp & 0×01) one_num++; check_temp >>= 1; } check_temp = *(str + 1); for(i = 0; i < 8; i++) { if(check_temp & 0×01) one_num++; check_temp >>= 1; } if(one_num % 2 ) even = 1; else even = 0; one_num = 0; check_temp = *(str + 2); for(i = 0; i < 8; i++) { if(check_temp & 0×01) one_num++; check_temp >>= 1; } check_temp = *(str + 3); for(i = 0; i < 8; i++) { if(check_temp & 0×01) one_num++; check_temp >>= 1; } if(one_num % 2 ) odd = 0; else odd = 1; one_num = 0; WG_DATA0 = 1; WG_DATA1 = 1; Delay_1ms(2); if(even) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } Delay_1ms(2); for(i = 0; i < 32; i++) { WG_DATA0 = 1; WG_DATA1 = 1; if(str[0] & 0×80) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } (*(long*)&str[0]) <<= 1; Delay_1ms(2); } WG_DATA0 = 1; WG_DATA1 = 1; if(odd) { WG_DATA1 = 0; Delay_50us(8); WG_DATA1 = 1; } else { WG_DATA0 = 0; Delay_50us(8); WG_DATA0 = 1; } Delay_1ms(2); }