ajakef:
I tried that code and got the same output as you. I'm not familiar with how you use the interrupt here though--I used attachInterrupt in mine. I'll try looking up the way you did it and see if it works in my code.
I just set the registers up directly rather than using the Arduino functions. See the datasheet for details.
This code should be equivalent:
#include <Streaming.h> //http://arduiniana.org/libraries/streaming/
#define LED LED_BUILTIN
volatile boolean intFlag;
boolean ledState;
void setup(void)
{
Serial.begin(115200);
pinMode(LED, OUTPUT);
attachInterrupt(0, flagInt0, FALLING);
}
void loop(void)
{
if (intFlag) {
intFlag = false;
digitalWrite(LED, ledState = !ledState);
Serial << millis() << endl;
}
}
void flagInt0(void)
{
intFlag = true;
}