marlin/ArduinoAddons/Arduino_0.xx/Sanguino/bootloaders/atmega1284p/pin_defs.h

#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega88) || defined(__AVR_ATmega8__) || defined(__AVR_ATmega88__)
/* Onboard LED is connected to pin PB5 in Arduino NG, Diecimila, and Duemilanove */
#define LED_DDR     DDRB
#define LED_PORT    PORTB
#define LED_PIN     PINB
#define LED         PINB5

/* Ports for soft UART */
#ifdef SOFT_UART
#define UART_PORT   PORTD
#define UART_PIN    PIND
#define UART_DDR    DDRD
#define UART_TX_BIT 1
#define UART_RX_BIT 0
#endif
#endif

#if defined(__AVR_ATmega8__)
  //Name conversion R.Wiersma
  #define UCSR0A        UCSRA
  #define UDR0          UDR
  #define UDRE0         UDRE
  #define RXC0          RXC
  #define FE0           FE
  #define TIFR1         TIFR
  #define WDTCSR        WDTCR
#endif

/* Luminet support */
#if defined(__AVR_ATtiny84__)
/* Red LED is connected to pin PA4 */
#define LED_DDR     DDRA
#define LED_PORT    PORTA
#define LED_PIN     PINA
#define LED         PINA4
/* Ports for soft UART - left port only for now. TX/RX on PA2/PA3 */
#ifdef SOFT_UART
#define UART_PORT   PORTA
#define UART_PIN    PINA
#define UART_DDR    DDRA
#define UART_TX_BIT 2
#define UART_RX_BIT 3
#endif
#endif

/* Sanguino support */
#if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)
/* Onboard LED is connected to pin PB0 on Sanguino */
#define LED_DDR     DDRB
#define LED_PORT    PORTB
#define LED_PIN     PINB
#define LED         PINB0

/* Ports for soft UART */
#ifdef SOFT_UART
#define UART_PORT   PORTD
#define UART_PIN    PIND
#define UART_DDR    DDRD
#define UART_TX_BIT 1
#define UART_RX_BIT 0
#endif
#endif

/* Mega support */
#if defined(__AVR_ATmega1280__)
/* Onboard LED is connected to pin PB7 on Arduino Mega */
#define LED_DDR     DDRB
#define LED_PORT    PORTB
#define LED_PIN     PINB
#define LED         PINB7

/* Ports for soft UART */
#ifdef SOFT_UART
#define UART_PORT   PORTE
#define UART_PIN    PINE
#define UART_DDR    DDRE
#define UART_TX_BIT 1
#define UART_RX_BIT 0
#endif
#endif