Bug fix for certain motions. Re-org of includes.

- Critical bug fix for diagonal motions that continue on the same
direction or return in the exact opposite direction. This issue could
cause Grbl to crash intermittently due to a numerical round-off error.
Grbl versions prior to v0.9g shouldn’t have this issue.

- Reorganized all of the includes used by Grbl. Centralized it into a
single “grbl.h” include. This will help simplify the compiling and
uploading process through the Arduino IDE.

- Added an example .INO file for users to simply open and run when
compiling and uploading through the IDE. More to come later.

config.h

@@ -32,7 +32,6 @@
 
 #ifndef config_h
 #define config_h
-#include "system.h"
 
 
 // Default settings. Used when resetting EEPROM. Change to desired name in defaults.h

coolant_control.c

@@ -18,10 +18,7 @@
   along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
 */  
 
-#include "system.h"
-#include "coolant_control.h"
-#include "protocol.h"
-#include "gcode.h"
+#include "grbl.h"
 
 
 void coolant_init()

examples/Grbl/Grbl.ino

@@ -0,0 +1,22 @@
+#include <config.h>
+#include <coolant_control.h>
+#include <cpu_map.h>
+#include <defaults.h>
+#include <eeprom.h>
+#include <gcode.h>
+#include <grbl.h>
+#include <limits.h>
+#include <motion_control.h>
+#include <nuts_bolts.h>
+#include <planner.h>
+#include <print.h>
+#include <probe.h>
+#include <protocol.h>
+#include <report.h>
+#include <serial.h>
+#include <settings.h>
+#include <spindle_control.h>
+#include <stepper.h>
+#include <system.h>
+
+#include <src/main.h>

gcode.c

@@ -24,15 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */  
 
-#include "system.h"
-#include "settings.h"
-#include "protocol.h"
-#include "gcode.h"
-#include "motion_control.h"
-#include "spindle_control.h"
-#include "coolant_control.h"
-#include "probe.h"
-#include "report.h"
+#include "grbl.h"
 
 // NOTE: Max line number is defined by the g-code standard to be 99999. It seems to be an
 // arbitrary value, and some GUIs may require more. So we increased it based on a max safe

grbl.h

@@ -25,25 +25,41 @@
 #ifndef grbl_h
 #define grbl_h
 
-// All of the Grbl system include files.
+#define GRBL_VERSION "0.9h"
+#define GRBL_VERSION_BUILD "20150210"
+
+// Define standard libraries used by Grbl.
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+#include <util/delay.h>
+#include <math.h>
+#include <inttypes.h>    
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+// Define the Grbl system include files.
 #include "config.h"
-#include "coolant_control.h"
-#include "cpu_map.h"
+#include "nuts_bolts.h"
+#include "settings.h"
+#include "system.h"
 #include "defaults.h"
+#include "cpu_map.h"
+#include "coolant_control.h"
 #include "eeprom.h"
 #include "gcode.h"
 #include "limits.h"
 #include "motion_control.h"
-#include "nuts_bolts.h"
 #include "planner.h"
 #include "print.h"
 #include "probe.h"
 #include "protocol.h"
 #include "report.h"
 #include "serial.h"
-#include "settings.h"
 #include "spindle_control.h"
 #include "stepper.h"
-#include "system.h"
 
 #endif

limits.c

@@ -24,14 +24,8 @@
     Copyright (c) 2012 Sungeun K. Jeon
 */  
   
-#include "system.h"
-#include "settings.h"
-#include "protocol.h"
-#include "planner.h"
-#include "stepper.h"
-#include "motion_control.h"
-#include "limits.h"
-#include "report.h"
+#include "grbl.h"
+
 
 // Homing axis search distance multiplier. Computed by this value times the axis max travel.
 #define HOMING_AXIS_SEARCH_SCALAR  1.5 // Must be > 1 to ensure limit switch will be engaged.

main.c

@@ -24,19 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */  
 
-#include "system.h"
-#include "serial.h"
-#include "settings.h"
-#include "protocol.h"
-#include "gcode.h"
-#include "planner.h"
-#include "stepper.h"
-#include "spindle_control.h"
-#include "coolant_control.h"
-#include "motion_control.h"
-#include "limits.h"
-#include "probe.h"
-#include "report.h"
+#include "grbl.h"
 
 
 // Declare system global variable structure

motion_control.c

@@ -25,18 +25,7 @@
     Copyright (c) 2011 Jens Geisler
 */  
 
-#include "system.h"
-#include "settings.h"
-#include "protocol.h"
-#include "gcode.h"
-#include "planner.h"
-#include "stepper.h"
-#include "motion_control.h"
-#include "spindle_control.h"
-#include "coolant_control.h"
-#include "limits.h"
-#include "probe.h"
-#include "report.h"
+#include "grbl.h"
 
 
 // Execute linear motion in absolute millimeter coordinates. Feed rate given in millimeters/second

motion_control.h

@@ -26,7 +26,7 @@
 
 #ifndef motion_control_h
 #define motion_control_h
-#include "gcode.h"
+
 
 #define HOMING_CYCLE_LINE_NUMBER -1
 

nuts_bolts.c

@@ -24,8 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "print.h"
+#include "grbl.h"
 
 
 #define MAX_INT_DIGITS 8 // Maximum number of digits in int32 (and float)

planner.c

@@ -25,12 +25,7 @@
     Copyright (c) 2011 Jens Geisler
 */ 
 
-#include "system.h"
-#include "planner.h"
-#include "protocol.h"
-#include "stepper.h"
-#include "settings.h"
-
+#include "grbl.h"
 
 #define SOME_LARGE_VALUE 1.0E+38 // Used by rapids and acceleration maximization calculations. Just needs
                                  // to be larger than any feasible (mm/min)^2 or mm/sec^2 value.
@@ -388,13 +383,19 @@ uint8_t plan_check_full_buffer()
        change the overall maximum entry speed conditions of all blocks.
     */
     // NOTE: Computed without any expensive trig, sin() or acos(), by trig half angle identity of cos(theta).
-    junction_cos_theta = min(junction_cos_theta, 1.0); // Check for numerical round-off.
-    float sin_theta_d2 = sqrt(0.5*(1.0-junction_cos_theta)); // Trig half angle identity. Always positive.
+    if (junction_cos_theta > 0.99) {
+      //  For a 0 degree acute junction, just set minimum junction speed. 
+      block->max_junction_speed_sqr = MINIMUM_JUNCTION_SPEED*MINIMUM_JUNCTION_SPEED;
+    } else {
+      junction_cos_theta = max(junction_cos_theta,-0.99); // Check for numerical round-off to avoid divide by zero.
+      float sin_theta_d2 = sqrt(0.5*(1.0-junction_cos_theta)); // Trig half angle identity. Always positive.
 
-    // TODO: Technically, the acceleration used in calculation needs to be limited by the minimum of the
-    // two junctions. However, this shouldn't be a significant problem except in extreme circumstances.
-    block->max_junction_speed_sqr = max( MINIMUM_JUNCTION_SPEED*MINIMUM_JUNCTION_SPEED,
-                                 (block->acceleration * settings.junction_deviation * sin_theta_d2)/(1.0-sin_theta_d2) );
+      // TODO: Technically, the acceleration used in calculation needs to be limited by the minimum of the
+      // two junctions. However, this shouldn't be a significant problem except in extreme circumstances.
+      block->max_junction_speed_sqr = max( MINIMUM_JUNCTION_SPEED*MINIMUM_JUNCTION_SPEED,
+                                   (block->acceleration * settings.junction_deviation * sin_theta_d2)/(1.0-sin_theta_d2) );
+
+    }
   }
 
   // Store block nominal speed

print.c

@@ -24,9 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "serial.h"
-#include "settings.h"
+#include "grbl.h"
 
 
 void printString(const char *s)

probe.c

@@ -18,9 +18,8 @@
   along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
 */
   
-#include "system.h"
-#include "settings.h"
-#include "probe.h"
+#include "grbl.h"
+
 
 // Inverts the probe pin state depending on user settings and probing cycle mode.
 uint8_t probe_invert_mask;

protocol.c

@@ -24,15 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "serial.h"
-#include "settings.h"
-#include "protocol.h"
-#include "gcode.h"
-#include "planner.h"
-#include "stepper.h"
-#include "motion_control.h"
-#include "report.h"
+#include "grbl.h"
 
 
 static char line[LINE_BUFFER_SIZE]; // Line to be executed. Zero-terminated.

report.c

@@ -26,16 +26,7 @@
   methods to accomodate their needs.
 */
 
-#include "system.h"
-#include "report.h"
-#include "print.h"
-#include "settings.h"
-#include "gcode.h"
-#include "coolant_control.h"
-#include "planner.h"
-#include "spindle_control.h"
-#include "stepper.h"
-#include "serial.h"
+#include "grbl.h"
 
 
 // Handles the primary confirmation protocol response for streaming interfaces and human-feedback.

serial.c

@@ -24,11 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include <avr/interrupt.h>
-#include "system.h"
-#include "serial.h"
-#include "motion_control.h"
-#include "protocol.h"
+#include "grbl.h"
 
 
 uint8_t serial_rx_buffer[RX_BUFFER_SIZE];

settings.c

@@ -24,13 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "settings.h"
-#include "eeprom.h"
-#include "protocol.h"
-#include "report.h"
-#include "limits.h"
-#include "stepper.h"
+#include "grbl.h"
 
 settings_t settings;
 

settings.h

@@ -27,9 +27,8 @@
 #ifndef settings_h
 #define settings_h
 
+#include "grbl.h"
 
-#define GRBL_VERSION "0.9h"
-#define GRBL_VERSION_BUILD "20150204"
 
 // Version of the EEPROM data. Will be used to migrate existing data from older versions of Grbl
 // when firmware is upgraded. Always stored in byte 0 of eeprom

spindle_control.c

@@ -24,10 +24,7 @@
     Copyright (c) 2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "spindle_control.h"
-#include "protocol.h"
-#include "gcode.h"
+#include "grbl.h"
 
 
 void spindle_init()

stepper.c

@@ -24,12 +24,7 @@
     Copyright (c) 2011-2012 Sungeun K. Jeon
 */ 
 
-#include "system.h"
-#include "nuts_bolts.h"
-#include "stepper.h"
-#include "settings.h"
-#include "planner.h"
-#include "probe.h"
+#include "grbl.h"
 
 
 // Some useful constants.

system.c

@@ -18,14 +18,7 @@
   along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "system.h"
-#include "settings.h"
-#include "protocol.h"
-#include "gcode.h"
-#include "motion_control.h"
-#include "stepper.h"
-#include "report.h"
-#include "print.h"
+#include "grbl.h"
 
 
 void system_init() 

system.h

@@ -21,25 +21,7 @@
 #ifndef system_h
 #define system_h
 
-// Define system header files and standard libraries used by Grbl
-#include <avr/io.h>
-#include <avr/pgmspace.h>
-#include <avr/interrupt.h>
-#include <avr/wdt.h>
-#include <util/delay.h>
-#include <math.h>
-#include <inttypes.h>    
-#include <string.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdbool.h>
-
-// Define Grbl configuration and shared header files
-#include "config.h"
-#include "defaults.h"
-#include "cpu_map.h"
-#include "nuts_bolts.h"
-
+#include "grbl.h"
 
 // Define system executor bit map. Used internally by realtime protocol as realtime command flags, 
 // which notifies the main program to execute the specified realtime command asynchronously.