timer2.cpp

#include <MsTimer2.h>

/* タイマ割り込み間隔 */
#define TIMER2_INTERVAL (unsigned long)500

#define LOCK 1
#define UNLOCK 0

volatile int lock = 0;

/* タイマ割り込み */
void timer2interrupt() {
  lock = UNLOCK; /* ロック開放 */
}

void setup() {
  Serial.begin(115200);
  MsTimer2::set(TIMER2_INTERVAL, timer2interrupt);
  MsTimer2::start();
}

void loop() {
  if( lock == UNLOCK ){
    /* 何か処理 */
    lock = LOCK;
  }
}