Ports on Wiring

For a layout of ports on Wiring boards you can take a look at its great reference on I/O Ports. Notice that there are seven ports each one with eight pins. Some ports are discrete (digital) and the others analog. There are also ISP and TWI ports used for special purpose. If you are not familiar with Wiring boards make sure you look and understand all parts and features. Arduino boards are similar to Wiring but somewhat smaller. Both have a USB port which acts as a serial interface to any modern computer and for getting dc power.

Cross reference between the Wiring programming environment and AVRLIB is as follows:

• Layout of Ports in Wiring board correspond on AVR-GCC as follows:

  
   		 
  //
  //  ATMega128                WIRING
  //  =========                ======
  //  
  //  PORTD                    PORT-0
  //  PORTC                    PORT-1
  //  PORTA                    PORT-2
  //  PORTB                    PORT-3
  //  PORTE                    PORT-4
  //  PORTF                    PORT-5
  //  PORTG                    PORT-6
  //
  //  PORTG                    BUILT-IN LED
  //
  
  

• Layout of pins in Wiring board correspond with AVR-GCC as follows:

  
   		 
  //
  //  pd0                   WPIN0
  //  pd1                   WPIN1
  //   .                      .
  //  pd7                   WPIN7
  //
  //  pc0                   WPIN8
  //   .                      .
  //   .                      .
  //  pc7                   WPIN15
  //   .                      .
  //   .                      .
  //   .                      .
  //  pg0                   WPIN48
  //
  //
  
  

• PORTF is the analog port on ATMega128. A layout of corresponding analog pins in is as follows:

  
   		 
  //
  //  Ch0                   W-APIN0
  //  Ch1                   W-APIN1
  //   .                      .
  //  Ch7                   W-APIN7
  //
  
  

  Note that Chx or channelx are the analog input pins only on PORTF. More information about the ATMega128 HERE