gcode_parse.h

#ifndef	_GCODE_PARSE_H
#define	_GCODE_PARSE_H

#include	<stdint.h>

#include	"dda.h"

// wether the asterisk (checksum-command) is included for checksum calculation
// undefined for RepRap host software
//#define ASTERISK_IN_CHECKSUM_INCLUDED

// wether to insist on N line numbers
// if not defined, N's are completely ignored
//#define	REQUIRE_LINENUMBER

// wether to insist on a checksum
//#define	REQUIRE_CHECKSUM

// this is a very crude decimal-based floating point structure. a real floating point would at least have signed exponent
typedef struct {
	uint32_t	sign			:1;
	uint32_t	mantissa	:24;
	uint32_t	exponent	:7;
} decfloat;

// this holds all the possible data from a received command
typedef struct {
	uint8_t					seen_G	:1;
	uint8_t					seen_M	:1;
	uint8_t					seen_X	:1;
	uint8_t					seen_Y	:1;
	uint8_t					seen_Z	:1;
	uint8_t					seen_E	:1;
	uint8_t					seen_F	:1;
	uint8_t					seen_S	:1;

	uint8_t					seen_P	:1;
	uint8_t					seen_N	:1;
	uint8_t					seen_checksum				:1;
	uint8_t					seen_semi_comment		:1;
	uint8_t					seen_parens_comment	:1;

	uint8_t					option_relative			:1;
	uint8_t					option_inches				:1;

	uint8_t						G;
	uint8_t						M;
	TARGET						target;

	int16_t						S;
	uint16_t					P;

	uint32_t					N;
	uint32_t					N_expected;

	uint8_t						checksum_read;
	uint8_t						checksum_calculated;
} GCODE_COMMAND;

// the command being processed
extern GCODE_COMMAND next_target;

// utility functions
int32_t	decfloat_to_int(decfloat *df, int32_t multiplicand, int32_t denominator);

// this is where we construct a move without a gcode command, useful for gcodes which require multiple moves eg; homing
void SpecialMoveXY(int32_t x, int32_t y, uint32_t f);
void SpecialMoveZ(int32_t z, uint32_t f);
void SpecialMoveE(int32_t e, uint32_t f);

// accept the next character and process it
void gcode_parse_char(uint8_t c);

// uses the global variable next_target.N
void request_resend(void);

#endif	/* _GCODE_PARSE_H */