#ifdef CPU_MAP_ATMEGA328P // (Arduino Uno) Officially supported by Grbl.
// Define serial port pins and interrupt vectors.
#define SERIAL_RX USART_RX_vect
#define SERIAL_UDRE USART_UDRE_vect
// Define step pulse output pins. NOTE: All step bit pins must be on the same port.
#define STEP_DDR DDRD
#define STEP_PORT PORTD
#define X_STEP_BIT 2 // Uno Digital Pin 2
#define Y_STEP_BIT 3 // Uno Digital Pin 3
#define Z_STEP_BIT 4 // Uno Digital Pin 4
#define STEP_MASK
1<<X_STEP_BIT)|(1<<Y_STEP_BIT)|(1<<Z_STEP_BIT
// All step bits
// Define step direction output pins. NOTE: All direction pins must be on the same port.
#define DIRECTION_DDR DDRD
#define DIRECTION_PORT PORTD
#define X_DIRECTION_BIT 5 // Uno Digital Pin 5
#define Y_DIRECTION_BIT 6 // Uno Digital Pin 6
#define Z_DIRECTION_BIT 7 // Uno Digital Pin 7
#define DIRECTION_MASK
1<<X_DIRECTION_BIT)|(1<<Y_DIRECTION_BIT)|(1<<Z_DIRECTION_BIT
// All direction bits
// Define stepper driver enable/disable output pin.
#define STEPPERS_DISABLE_DDR DDRB
#define STEPPERS_DISABLE_PORT PORTB
#define STEPPERS_DISABLE_BIT 0 // Uno Digital Pin 8
#define STEPPERS_DISABLE_MASK (1<<STEPPERS_DISABLE_BIT)
// Define homing/hard limit switch input pins and limit interrupt vectors.
// NOTE: All limit bit pins must be on the same port, but not on a port with other input pins (CONTROL).
#define LIMIT_DDR DDRB
#define LIMIT_PIN PINB
#define LIMIT_PORT PORTB
#define X_LIMIT_BIT 1 // Uno Digital Pin 9
#define Y_LIMIT_BIT 2 // Uno Digital Pin 10
#ifdef VARIABLE_SPINDLE // Z Limit pin and spindle enabled swapped to access hardware PWM on Pin 11.
#define Z_LIMIT_BIT 4 // Uno Digital Pin 12
#else
#define Z_LIMIT_BIT 3 // Uno Digital Pin 11
#endif
#define LIMIT_MASK
1<<X_LIMIT_BIT)|(1<<Y_LIMIT_BIT)|(1<<Z_LIMIT_BIT
// All limit bits
#define LIMIT_INT PCIE0 // Pin change interrupt enable pin
#define LIMIT_INT_vect PCINT0_vect
#define LIMIT_PCMSK PCMSK0 // Pin change interrupt register
// Define spindle enable and spindle direction output pins.
#define SPINDLE_ENABLE_DDR DDRB
#define SPINDLE_ENABLE_PORT PORTB
// Z Limit pin and spindle PWM/enable pin swapped to access hardware PWM on Pin 11.
#ifdef VARIABLE_SPINDLE
#ifdef USE_SPINDLE_DIR_AS_ENABLE_PIN
// If enabled, spindle direction pin now used as spindle enable, while PWM remains on D11.
#define SPINDLE_ENABLE_BIT 5 // Uno Digital Pin 13 (NOTE: D13 can't be pulled-high input due to LED.)
#else
#define SPINDLE_ENABLE_BIT 3 // Uno Digital Pin 11
#endif
#else
#define SPINDLE_ENABLE_BIT 4 // Uno Digital Pin 12
#endif
#ifndef USE_SPINDLE_DIR_AS_ENABLE_PIN
#define SPINDLE_DIRECTION_DDR DDRB
#define SPINDLE_DIRECTION_PORT PORTB
#define SPINDLE_DIRECTION_BIT 5 // Uno Digital Pin 13 (NOTE: D13 can't be pulled-high input due to LED.)
#endif
