Introduce gcode_init() and honor E_ABSOLUTE as the default.

config.default.h

@@ -115,6 +115,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.gen3.h

@@ -111,6 +111,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.gen6.h

@@ -117,6 +117,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.gen7.h

@@ -120,6 +120,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.ramps-v1.2.h

@@ -118,6 +118,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.ramps-v1.3.h

@@ -117,6 +117,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.sanguinololu-v1.1.h

@@ -117,6 +117,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

config.sanguinololu-v1.2.h

@@ -117,6 +117,8 @@
 
 /**	\def E_ABSOLUTE
 	Some G-Code creators produce relative length commands for the extruder, others absolute ones. G-Code using absolute lengths can be recognized when there are G92 E0 commands from time to time. If you have G92 E0 in your G-Code, define this flag.
+
+	This is the startup default and can be changed with M82/M83 while running.
 */
 // #define E_ABSOLUTE
 

gcode_parse.c

@@ -75,6 +75,18 @@ static int32_t decfloat_to_int(decfloat *df, uint32_t multiplicand) {
 	return df->sign ? -(int32_t)r : (int32_t)r;
 }
 
+void gcode_init(void) {
+	// gcc guarantees us all variables are initialised to 0.
+
+	// assume a G1 by default
+	next_target.seen_G = 1;
+	next_target.G = 1;
+
+	#ifndef E_ABSOLUTE
+		next_target.option_e_relative = 1;
+	#endif
+}
+
 // TODO TODO: write a gcode_init(), next_target is used uninitialised. For a hint on what to do, see line 340ff.
 
 /// Character Received - add it to our command

gcode_parse.h

@@ -66,6 +66,8 @@ typedef struct {
 /// the command being processed
 extern GCODE_COMMAND next_target;
 
+void gcode_init(void);
+
 /// accept the next character and process it
 void gcode_parse_char(uint8_t c);
 

mendel.c

@@ -275,7 +275,7 @@ void init(void) {
 	serial_init();
 
 	// set up G-code parsing
-	// gcode_init();
+	gcode_init();
 
 	// set up inputs and outputs
 	io_init();