Arduino利用TimerOne库产生固定频率和占空比的方波

TimerOne地址：

https://code.google.com/archive/p/arduino-timerone/downloads

ex:

#include "TimerOne.h"

void setup()
{
pinMode(10, OUTPUT);
Timer1.initialize(500000); // initialize timer1, and set a 1/2 second period
Timer1.pwm(9, 512); // setup pwm on pin 9, 50% duty cycle
Timer1.attachInterrupt(callback); // attaches callback() as a timer overflow interrupt
}

void callback()
{
digitalWrite(10, digitalRead(10) ^ 1);
}

void loop()
{
// your program here...
}
*/