Tool number bug fix. Updated documentation.

- [fix] Tool numbers were not being tracked and reported correctly. Now
shows tool number values in $G when programmed.

- [fix] Added a max tool number value check to the g-code parser.

- [doc] Added a new error code for invalid tool number. Updated CSV and
interface documents.

- [doc] Added a implementation note for buffer state in status reports.
Don’t rely on this data for streaming.

grbl/cpu_map.h

@@ -98,7 +98,7 @@
   #define COOLANT_FLOOD_BIT   3  // Uno Analog Pin 3
   #define COOLANT_MIST_DDR   DDRC
   #define COOLANT_MIST_PORT  PORTC
-  #define COOLANT_MIST_BIT   4  // Uno Analog Pin 3
+  #define COOLANT_MIST_BIT   4  // Uno Analog Pin 4
 
   // Define user-control controls (cycle start, reset, feed hold) input pins.
   // NOTE: All CONTROLs pins must be on the same port and not on a port with other input pins (limits).

grbl/gcode.c

@@ -25,6 +25,7 @@
 // arbitrary value, and some GUIs may require more. So we increased it based on a max safe
 // value when converting a float (7.2 digit precision)s to an integer.
 #define MAX_LINE_NUMBER 10000000
+#define MAX_TOOL_NUMBER 255 // Limited by max unsigned 8-bit value
 
 #define AXIS_COMMAND_NONE 0
 #define AXIS_COMMAND_NON_MODAL 1
@@ -310,7 +311,10 @@ uint8_t gc_execute_line(char *line)
           // case 'Q': // Not supported
           case 'R': word_bit = WORD_R; gc_block.values.r = value; break;
           case 'S': word_bit = WORD_S; gc_block.values.s = value; break;
-          case 'T': word_bit = WORD_T; break; // gc.values.t = int_value;
+          case 'T': word_bit = WORD_T; 
+					  if (value > MAX_TOOL_NUMBER) { FAIL(STATUS_GCODE_MAX_VALUE_EXCEEDED); }
+            gc_block.values.t = int_value;
+						break;
           case 'X': word_bit = WORD_X; gc_block.values.xyz[X_AXIS] = value; axis_words |= (1<<X_AXIS); break;
           case 'Y': word_bit = WORD_Y; gc_block.values.xyz[Y_AXIS] = value; axis_words |= (1<<Y_AXIS); break;
           case 'Z': word_bit = WORD_Z; gc_block.values.xyz[Z_AXIS] = value; axis_words |= (1<<Z_AXIS); break;

grbl/grbl.h

@@ -23,7 +23,7 @@
 
 // Grbl versioning system
 #define GRBL_VERSION "1.1e"
-#define GRBL_VERSION_BUILD "20170103"
+#define GRBL_VERSION_BUILD "20170114"
 
 // Define standard libraries used by Grbl.
 #include <avr/io.h>

grbl/report.h

@@ -57,6 +57,7 @@
 #define STATUS_GCODE_NO_OFFSETS_IN_PLANE 35
 #define STATUS_GCODE_UNUSED_WORDS 36
 #define STATUS_GCODE_G43_DYNAMIC_AXIS_ERROR 37
+#define STATUS_GCODE_MAX_VALUE_EXCEEDED 38
 
 // Define Grbl alarm codes. Valid values (1-255). 0 is reserved.
 #define ALARM_HARD_LIMIT_ERROR      EXEC_ALARM_HARD_LIMIT