Neal Horman
Wiegand card reader driver library
This is a Wiegand 2 signal (Data0, Data1) card reader interface library.
Information
Todo - parity checking.
Wiegand technology References
- How Do Wiegand Card Readers and Devices Work
- HID
- ib technology
- Pyramid
- Mercury - Missing Diagrams
- RS2 Technologies - Some documented card formats
Hobbyist project
Library use example
/*
* Wiegand card reader driver library
* Copyright (c) 2012 Neal Horman - http://www.wanlink.com
*
* License: MIT open source (http://opensource.org/licenses/MIT)
* Summary;
* Use / modify / distribute / publish it how you want and
* if you use it, or don't, you can't hold me liable for how
* it does or doesn't work.
* If it doesn't work how you want, don't use it, or change
* it so that it does work.
*/
#include "mbed.h"
#include "ReaderWiegand.h"
Serial gSerial(USBTX, USBRX);
ReaderWiegand gReader(p10,p11);
int main()
{
gSerial.printf("Ready\r\n");
while(1)
{
if(gReader.isNew())
{ uint8_t bq = gReader.bitCount();
uint64_t bits = gReader.bits();
for(uint8_t i=0; i<bq; i++)
gSerial.printf("%c",'0' + ( ( bits & ( (uint64_t)1 << i ) ) != 0));
gSerial.printf(" bq: %u h: 0x%llX ",bq,bits);
if(gReader.isValid())
gSerial.printf("f: %lu, c: %lu\r\n",gReader.facility(),gReader.card());
else
gSerial.printf("Unknown format\r\n");
gReader.old();
}
}
}
Diff: ReaderWiegand.h
- Revision:
- 0:b468573740b5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ReaderWiegand.h Wed Jul 18 01:54:58 2012 +0000
@@ -0,0 +1,46 @@
+/*
+ * Wiegand card reader driver library
+ * Copyright (c) 2012 Neal Horman - http://www.wanlink.com
+ *
+ * License: MIT open source (http://opensource.org/licenses/MIT)
+ * Summary;
+ * Use / modify / distribute / publish it how you want and
+ * if you use it, or don't, you can't hold me liable for how
+ * it does or doesn't work.
+ * If it doesn't work how you want, don't use it, or change
+ * it so that it does work.
+ */
+
+
+#ifndef _READERWIEGAND_H_
+#define _READERWIEGAND_H_
+
+#include "Reader.h"
+
+// Use interupt driven inputs to gather the card data
+class ReaderWiegand : public Reader
+{
+public:
+ ReaderWiegand(PinName data0, PinName data1) : Reader(), mData0Irq(data0), mData1Irq(data1)
+ {
+ mData0Irq.mode(PullUp);
+ mData1Irq.mode(PullUp);
+ mData0Irq.fall(this,&ReaderWiegand::data0Fall);
+ mData1Irq.fall(this,&ReaderWiegand::data1Fall);
+ mData0Irq.rise(this,&ReaderWiegand::data01Rise);
+ mData1Irq.rise(this,&ReaderWiegand::data01Rise);
+ };
+protected:
+ InterruptIn mData0Irq;
+ InterruptIn mData1Irq;
+ Timeout mTimer;
+ void swiped() { Reader::swiped(); };
+
+ void timerRestart() { mTimer.detach(); mTimer.attach_us(this,&ReaderWiegand::swiped,50*1000); };
+
+ void data0Fall() { shiftIn(0); timerRestart(); };
+ void data1Fall() { shiftIn(1); timerRestart(); };
+ void data01Rise() { timerRestart(); };
+};
+
+#endif
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