Revision 0:35c0300ee644, committed 2014-12-04

Comitter:

blark

Date:

Thu Dec 04 16:08:04 2014 +0000

Commit message:

first commit;

Changed in this revision

diff -r 000000000000 -r 35c0300ee644 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Dec 04 16:08:04 2014 +0000
@@ -0,0 +1,99 @@
+#include "mbed.h"
+
+#define MAX_BITS 100
+#define WIEGAND_WAIT_TIME 3000      // wait for 3000us for the next Wiegand signal
+#define DATA0_PIN PTC2              // see http://developer.mbed.org/platforms/FRDM-K64F/ for pin locations
+#define DATA1_PIN PTC3              // customize for board as appropriate.
+#define DATA0_OUT_PIN PTC7
+#define DATA1_OUT_PIN PTC5
+
+Serial pc(USBTX, USBRX);
+Timeout wiegandTimer;
+
+InterruptIn sw(SW2);
+InterruptIn data0_int(DATA0_PIN);
+InterruptIn data1_int(DATA1_PIN);
+DigitalOut data0_out(DATA0_OUT_PIN);
+DigitalOut data1_out(DATA1_OUT_PIN);
+
+volatile unsigned char dataBits[MAX_BITS];  // stores all of the data bits
+volatile unsigned char bitCount = 0;        // number of bits captured
+volatile bool flagDataIn = false;           // false when data is currently being captured
+volatile bool readComplete = false;         // true when a card read has been completed
+volatile bool sendData = false;             
+
+void txWiegand(uint8_t *data, uint8_t size) {
+    // sends wiegand data for testing purposes. 
+    for (uint8_t i=0; i<size; i++) {
+        // use a ternary operator to toggle the correct pin
+        data[i] ? data1_out=0 : data0_out=0; 
+        wait_us(40);
+        data[i] ? data1_out=1 : data0_out=1;
+        wait_us(2249);
+    }
+} 
+
+void parseWiegand (void) {
+    // tell the main while loop the signal to process data
+    readComplete = true;
+}
+
+void DATA0_ISR() {
+    bitCount++;
+    flagDataIn = true;
+}
+
+void DATA1_ISR() {
+    dataBits[bitCount] = 1;
+    bitCount++;
+    flagDataIn = true;
+}
+
+void sw_isr() {
+    sendData = true;        
+}
+
+int main()
+{
+    pc.baud (115200);
+    
+    data0_int.fall(&DATA0_ISR); // assign ISRs 
+    data1_int.fall(&DATA1_ISR);
+    sw.fall(&sw_isr);
+       
+    data0_out = 1;
+    data1_out = 1;
+    
+    while (true) {
+        if ((bitCount > 0) && flagDataIn) {
+            // we got more valid data so reset the timer
+            wiegandTimer.attach_us(&parseWiegand, WIEGAND_WAIT_TIME);
+            flagDataIn = false;
+        }
+        if (readComplete) {
+            // After the Wiegand data has been read we need to parse it
+            pc.printf("\nRead %d bits: ", bitCount);
+            // Print the card value in binary
+            for (uint8_t i=0; i<bitCount; i++) {
+                pc.printf("%d", dataBits[i]);
+            }
+            pc.printf("\n");
+            
+            /* in the future parse card code and facility code here.
+             */
+            
+            // reset variables for next read
+            readComplete = false;
+            bitCount = 0;
+            for (uint8_t i=0; i<MAX_BITS; i++) {
+                dataBits[i] = 0;
+            }
+        }
+        if (sendData) {
+            // do things
+            uint8_t testData[26] = { 0,0,1,1,0,0,1,0,0,0,0,1,0,0,1,1,0,0,0,1,0,1,0,1,0,0 };
+            txWiegand(testData, 26); 
+            sendData = false;
+        }  
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 35c0300ee644 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Dec 04 16:08:04 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5
\ No newline at end of file