dotnfc Tang / LibPN532

PN532 Driver library This library provides an abstract API to drive the pn532 nfc chip, with I2C/HSU/SPI interface. Its based on the Seeed Studio's Arduino version.

Dependents:   PN532_ReadUid Nfctest2

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Show/hide line numbers Arduino.cpp Source File

Arduino.cpp

00001 ////////////////////////////////////////////////////////////////////////////////
00002 // arudino wraper functions
00003 // by dotnfc@163.com
00004 // 2016/09/10 18:16:00
00005 
00006 #include "Arduino.h"
00007 
00008 
00009 /*==============================================================================
00010  * \brief arduino like 'tone ()'
00011  */
00012 void tone(PwmOut &buz, long frequency)
00013 {
00014     if (frequency == 0) {
00015         buz = 0;
00016         return;
00017     }
00018     
00019     float period;
00020 
00021     // calculate the period of the note in turn play
00022     period = 1000000 / frequency;
00023     // set the period calculated at the PWM output
00024     buz.period_us (period);
00025     // establish a duty cycle of 50%
00026     buz.write (0.50f);  
00027 }
00028  
00029
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