GRBL 源文件编程求助

~菡萏非草水中生

// NOTE: All step bit and direction pins must be on the same port.
  #define STEPPING_DDR       DDRD
  #define STEPPING_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 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 STEP_MASK ((1<<X_STEP_BIT)|(1<<Y_STEP_BIT)|(1<<Z_STEP_BIT)) // All step bits
  #define DIRECTION_MASK ((1<<X_DIRECTION_BIT)|(1<<Y_DIRECTION_BIT)|(1<<Z_DIRECTION_BIT)) // All direction bits
  #define STEPPING_MASK (STEP_MASK | DIRECTION_MASK) // All stepping-related bits (step/direction)

  #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)

  // NOTE: All limit bit pins must be on the same port
  #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
  #define Z_LIMIT_BIT     3  // Uno Digital Pin 11
  #define LIMIT_INT       PCIE0  // Pin change interrupt enable pin
  #define LIMIT_INT_vect  PCINT0_vect
  #define LIMIT_PCMSK     PCMSK0 // Pin change interrupt register
  #define LIMIT_MASK ((1<<X_LIMIT_BIT)|(1<<Y_LIMIT_BIT)|(1<<Z_LIMIT_BIT)) // All limit bits

  #define SPINDLE_ENABLE_DDR   DDRB
  #define SPINDLE_ENABLE_PORT  PORTB
  #define SPINDLE_ENABLE_BIT   4  // Uno Digital Pin 12

  #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.)

  #define COOLANT_FLOOD_DDR   DDRC
  #define COOLANT_FLOOD_PORT  PORTC
  #define COOLANT_FLOOD_BIT   3  // Uno Analog Pin 3



2号点和3号点 又输出也当输入？？？？？重复利用？？

wldk

要看//后的  Uno Digital Pin
#define Y_LIMIT_BIT     2  是指PB的2      即  Uno Digital Pin 10

#define X_STEP_BIT         2  是指PD的2      即 Uno Digital Pin 2

wzqqwz

DDRD DDRB这些是什么意思啊？

#define X_LIMIT_BIT     1  // Uno Digital Pin 9
  #define Y_LIMIT_BIT     2  // Uno Digital Pin 10
  #define Z_LIMIT_BIT     3  // Uno Digital Pin 11

为什么 X_LIMIT_BIT     1  是  Pin 9？
看了很久，看不懂啊！！

秋叶秋衣

虽然注释部分不重要但是还是建议读一下cpu_map.h里有这样一段话
/* The cpu_map.h files serve as a central pin mapping selection file for different
   processor types or alternative pin layouts. This version of Grbl officially supports
   only the Arduino Mega328p. */