wiki:ArduinoToNativeC

Version 1 (modified by Eric Hazen, 6 years ago) (diff)

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Converting Arduino code to native C can be tricky. Here are some tips.

Digital I/O

In your arduino code you use "digitalWrite()" to control output bits. This does not exist in the "native" C environment we are now using.

For example you would use:

  digitalWrite( 13, HIGH);    // turn on LED
  digitalWrite( 13, LOW);     // turn off LED

This sets pin 13 on the Arduino board to a '1' (which also has the LED).

In the native C environment, first of all you do not use pin numbers, but names such as PB0, PB1 etc. These you will see for the Arduino on the typical pinout diagram (yellow boxes): uno.jpg

In the code you would use the following:

  PORTB |= _BV( PB5);      // turn on LED
  PORTB &= ~_BV( PB5);     // turn off LED

Also, setting the direction of the pins (input/output) is a bit different. In the Arduino environment you would use:

  pinMode( 13, OUTPUT);   // LED pin 13 is output

While in native C you would use:

  DDRB |= _BV( PB5);     // PB5 (LED) is output