Aniket Udare / LibPN532_NFC

Forked from LibPN532

Dependents:   NFC_Secure_Access NFC_Secure_Access

Fork of LibPN532 by dotnfc Tang

Diff: Arduino.cpp

Revision:
0:db8030e71f55
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Arduino.cpp	Tue Sep 13 06:01:19 2016 +0000
@@ -0,0 +1,29 @@
+////////////////////////////////////////////////////////////////////////////////
+// arudino wraper functions
+// by dotnfc@163.com
+// 2016/09/10 18:16:00
+
+#include "Arduino.h"
+
+
+/*==============================================================================
+ * \brief arduino like 'tone ()'
+ */
+void tone(PwmOut &buz, long frequency)
+{
+    if (frequency == 0) {
+        buz = 0;
+        return;
+    }
+    
+    float period;
+
+    // calculate the period of the note in turn play
+    period = 1000000 / frequency;
+    // set the period calculated at the PWM output
+    buz.period_us (period);
+    // establish a duty cycle of 50%
+    buz.write (0.50f);  
+}
+ 
+