Fade

This example is based on http://arduino.cc/en/Tutorial/Fade

This demonstrates how to make a LED blinker, but with gradual fading. You must use a pin with hardware PWM support to connect the LED, but here we will use the builtin LED that all Arduino boards have (usually pin 13). Note that if you use a non-pwm pin with the Arduino library, it will compile fine and run. But the LED will not fade, just blink. For Highino it simply won't compile. Using a non-pwn pin for analog output is a clear error and must be fixed.

You could write the same example using the AnalogOutputPin class directly, but we are going to use the AnalogLed class, which is a simple wrapper designed for LEDs.

##Arduino

int led = 13;          // the pin that the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

void setup()  { 
    pinMode(led, OUTPUT);  // declare pin 9 to be an output
} 

void loop()  { 
    analogWrite(led, brightness); // set the brightness   

    // change the brightness for next time through the loop
    brightness = brightness + fadeAmount;

    // reverse the direction of the fading at the ends of the fade
    if (brightness == 0 || brightness == 255) {
      fadeAmount = -fadeAmount ; 
    }

    // wait for 30 milliseconds to see the dimming effect    
    delay(30);                            
}

Binary size: 1991 bytes.

##Highino

#include <Led>
#include <Time>

int main() {
    AnalogLed<13> led; // You could use 'BuiltinAnalogLed' instead of 'AnalogLed<13>' as well

    int fadeAmount = 5;
    while (true) {
        // Just change it! You could also use led.set(led.get()+value) or led.on(led.brightness()+value)
        led += fadeAmount;

        // We can read the brightness directly from the LED
        if (led.brightness() == 0 || led.brightness() == 255) {
          fadeAmount = -fadeAmount;
        }

        delay(30_ms); // 30ms delay
    }
}

Binary size: 654 bytes (32.8%).