dda_queue.c File Reference

DDA Queue - manage the move queue. More...

#include "dda_queue.h"
#include <string.h>
#include <avr/interrupt.h>
#include "config.h"
#include "timer.h"
#include "serial.h"
#include "sermsg.h"
#include "temp.h"
#include "delay.h"
#include "sersendf.h"
#include "clock.h"

Functions
DDA movebuffer[MOVEBUFFER_SIZE]	__attribute__ ((__section__(".bss")))
	move buffer.
uint8_t	queue_full ()
	check if the queue is completely full
uint8_t	queue_empty ()
	check if the queue is completely empty
void	queue_step ()
	Take a step or go to the next move.
void	enqueue (TARGET *t)
	add a move to the movebuffer
void	next_move ()
	go to the next move.
void	print_queue ()
	DEBUG - print queue.
void	queue_flush ()
	dump queue for emergency stop.
void	queue_wait ()
	waits for a space in the queue to become available
Variables
uint8_t	mb_head = 0
	movebuffer head pointer. Points to the last move in the queue.
uint8_t	mb_tail = 0
	movebuffer tail pointer. Points to the currently executing move

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Detailed Description

DDA Queue - manage the move queue.

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Function Documentation

DDA movebuffer [MOVEBUFFER_SIZE] __attribute__

(

(__section__(".bss"))

)

move buffer.

holds move queue

void enqueue

(

TARGET *

t )

add a move to the movebuffer

Note:

this function waits for space to be available if necessary, check queue_full() first if waiting is a problem

Referenced by home_x_positive(), home_y_positive(), home_z_positive(), and process_gcode_command().

void next_move

(

void

)

go to the next move.

be aware that this is sometimes called from interrupt context, sometimes not.

Referenced by enqueue(), and queue_step().

void print_queue

(

void

)

DEBUG - print queue.

Qt/hs format, t is tail, h is head, s is F/full, E/empty or neither

Referenced by clock_250ms(), and process_gcode_command().

void queue_flush

(

void

)

dump queue for emergency stop.

Todo:

effect on startpoint/current_position is undefined!

Referenced by process_gcode_command().