fix a few typos and correct english usage

1 files changed, 43 insertions, 44 deletions

diff --git a/Sprinter/Sprinter.pde b/Sprinter/Sprinter.pde
index 27a0bc3..94aa538 100644
--- a/Sprinter/Sprinter.pde
+++ b/Sprinter/Sprinter.pde
@@ -1,6 +1,6 @@
 /*
  Reprap firmware based on Sprinter
- Optimize for Sanguinololu 1.2 and above, RAMPS 
+ Optimized for Sanguinololu 1.2 and above / RAMPS 
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
  along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
 /*
-  This firmware is a mashup between Sprinter,grbl and parts from marlin.
+  This firmware is a mashup between Sprinter, grbl and parts from marlin.
   (https://github.com/kliment/Sprinter)
   
   Changes by Doppler Michael (midopple)
@@ -30,9 +30,9 @@
   Sprinter Changelog
   -  Look forward function --> calculate 16 Steps forward, get from Firmaware Marlin and Grbl
   -  Stepper control with Timer 1 (Interrupt)
-  -  Extruder heating with PID use a Softpwm (Timer 2) with 500 hz to free Timer1 für Steppercontrol
+  -  Extruder heating with PID use a Softpwm (Timer 2) with 500 hz to free Timer1 for Steppercontrol
   -  command M220 Sxxx --> tune Printing speed online (+/- 50 %)
-  -  G2 / G3 command --> circle funktion
+  -  G2 / G3 command --> circle function
   -  Baudrate set to 250 kbaud
   -  Testet on Sanguinololu Board
   -  M30 Command can delete files on SD Card
@@ -42,7 +42,7 @@
  Version 1.3.04T
   - Implement Plannercode from Marlin V1 big thanks to Erik
   - Stepper interrupt with Step loops
-  - Stepperfrequenz 30 Khz
+  - Stepperfrequency 30 Khz
   - New Command
     * M202 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
     * M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) im mm/sec^2 
@@ -50,7 +50,7 @@
   - Remove unused Variables
   - Check Uart Puffer while circle processing (CMD: G2 / G3)
   - Fast Xfer Function --> move Text to Flash
-  - Option to deaktivate ARC (G2/G3) function (save flash)
+  - Option to deactivate ARC (G2/G3) function (save flash)
   - Removed modulo (%) operator, which uses an expensive divide
 
  Version 1.3.05T
@@ -77,7 +77,7 @@
    A ';' inside a line ignores just the portion following the ';' character.
    The beginning of the line is still interpreted.
    
- - Same fix for SD Card, testet and work
+ - Same fix for SD Card, tested and work
 
  Version 1.3.09T
  - Move SLOWDOWN Function up
@@ -94,14 +94,13 @@
 - Make fastio & Arduino pin numbering consistent for AT90USB128x. --> Thanks to lincomatic
 - Select Speedtable with F_CPU
 - Use same Values for Speedtables as Marlin 
--
 
  Version 1.3.12T
 - Fixed arc offset.
 
  Version 1.3.13T
-- Extrudmultiply with code M221 Sxxx (S100 original Extrude value)
-- use Feedratefaktor only when Extrude > 0
+- Extrudemultiply with code M221 Sxxx (S100 original Extrude value)
+- use Feedratefactor only when Extrude > 0
 - M106 / M107 can drive the FAN with PWM + Port check for not using Timer 1
 - Added M93 command. Sends current steps for all axis.
 - New Option --> FAN_SOFT_PWM, with this option the FAN PWM can use every digital I/O
@@ -110,8 +109,8 @@
 - When endstop is hit count the virtual steps, so the print lose no position when endstop is hit
 
  Version 1.3.15T
-- M206 - set additional homeing offset 
-- Option for minimum FAN start speed --> #define MINIMUM_FAN_START_SPEED  50  (set it to zero to deaktivate)
+- M206 - set additional homing offset 
+- Option for minimum FAN start speed --> #define MINIMUM_FAN_START_SPEED  50  (set it to zero to deactivate)
   
  Version 1.3.16T
 - Extra Max Feedrate for Retract (MAX_RETRACT_FEEDRATE)
@@ -121,10 +120,10 @@
 - G4 Wait until last move is done
 
  Version 1.3.18T
-- Problem with Thermistor 3 table when sensor is brocken and temp is -20 °C
+- Problem with Thermistor 3 table when sensor is broken and temp is -20 °C
 
  Version 1.3.19T
-- Set maximum acceleration. If "steps per unit" is Change the acc were not recalculatet
+- Set maximum acceleration. If "steps per unit" is Change the acc were not recalculated
 - Extra Parameter for Max Extruder Jerk
 - New Parameter (max_e_jerk) in EEPROM --> Default settings after update !
 
@@ -213,11 +212,11 @@ void __cxa_pure_virtual(){};
 // M201 - Set maximum acceleration in units/s^2 for print moves (M201 X1000 Y1000)
 // M202 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
 // M203 - Set temperture monitor to Sx
-// M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) im mm/sec^2 
-// M205 - advanced settings:  minimum travel speed S=while printing T=travel only,  X= maximum xy jerk, Z=maximum Z jerk
-// M206 - set additional homeing offset
+// M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) in mm/sec^2
+// M205 - advanced settings:  minimum travel speed S=while printing T=travel only,  X=maximum xy jerk, Z=maximum Z jerk
+// M206 - set additional homing offset
 
-// M220 - set speed factor override percentage S:factor in percent 
+// M220 - set speed factor override percentage S=factor in percent 
 // M221 - set extruder multiply factor S100 --> original Extrude Speed 
 
 // M303 - PID relay autotune S<temperature> sets the target temperature. (default target temperature = 150C)
@@ -225,13 +224,13 @@ void __cxa_pure_virtual(){};
 // M400 - Finish all moves
 
 // M500 - stores paramters in EEPROM
-// M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
+// M501 - reads parameters from EEPROM (if you need to reset them after you changed them temporarily).
 // M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
 // M503 - Print settings
 
 // Debug feature / Testing the PID for Hotend
-// M601 - Show Temp jitter from Extruder (min / max value from Hotend Temperatur while printing)
-// M602 - Reset Temp jitter from Extruder (min / max val) --> Dont use it while Printing
+// M601 - Show Temp jitter from Extruder (min / max value from Hotend Temperature while printing)
+// M602 - Reset Temp jitter from Extruder (min / max val) --> Don't use it while Printing
 // M603 - Show Free Ram
 
 
@@ -268,8 +267,8 @@ unsigned long plateau_steps;
 //unsigned long steps_per_sqr_second;
 
 
-//adjustable feed faktor for online tuning printerspeed
-volatile int feedmultiply=100; //100->original / 200-> Faktor 2 / 50 -> Faktor 0.5
+//adjustable feed factor for online tuning printer speed
+volatile int feedmultiply=100; //100->original / 200 -> Factor 2 / 50 -> Factor 0.5
 int saved_feedmultiply;
 volatile bool feedmultiplychanged=false;
 volatile int extrudemultiply=100; //100->1 200->2
@@ -278,7 +277,7 @@ volatile int extrudemultiply=100; //100->1 200->2
 //unsigned long interval;
 float destination[NUM_AXIS] = {0.0, 0.0, 0.0, 0.0};
 float current_position[NUM_AXIS] = {0.0, 0.0, 0.0, 0.0};
-float add_homeing[3]={0,0,0};
+float add_homing[3]={0,0,0};
 
 static unsigned short virtual_steps_x = 0;
 static unsigned short virtual_steps_y = 0;
@@ -305,7 +304,7 @@ bool is_homing = false;
 
 
 #ifdef USE_ARC_FUNCTION
-//For arc centerpont, send bei Command G2/G3
+//For arc center point coordinates, sent by commands G2/G3
 float offset[3] = {0.0, 0.0, 0.0};
 #endif
 
@@ -356,7 +355,7 @@ unsigned long previous_millis_cmd = 0;
 unsigned long max_inactive_time = 0;
 unsigned long stepper_inactive_time = 0;
 
-//Temp Montor for repetier
+//Temp Monitor for repetier
 unsigned char manage_monitor = 255;
 
 
@@ -613,8 +612,8 @@ int FreeRam1(void)
 void analogWrite_check(uint8_t check_pin, int val)
 {
   #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__) 
-  //Atmega168 / 328 can not useed OCR1A and OCR1B
-  //This are PINS PB1 / PB2 or on Ardurino D9 / D10
+  //Atmega168/328 can't use OCR1A and OCR1B
+  //These are pins PB1/PB2 or on Arduino D9/D10
     if((check_pin != 9) && (check_pin != 10))
     {
         analogWrite(check_pin, val);
@@ -622,8 +621,8 @@ void analogWrite_check(uint8_t check_pin, int val)
   #endif
   
   #if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) 
-  //Atmega664P / 1284P can not useed OCR1A and OCR1B
-  //This are PINS PD4 / PD5 or on Ardurino D12 / D13
+  //Atmega664P/1284P can't use OCR1A and OCR1B
+  //These are pins PD4/PD5 or on Arduino D12/D13
     if((check_pin != 12) && (check_pin != 13))
     {
         analogWrite(check_pin, val);
@@ -631,8 +630,8 @@ void analogWrite_check(uint8_t check_pin, int val)
   #endif
 
   #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) 
-  //Atmega1280 / 2560 can not useed OCR1A, OCR1B and OCR1C
-  //This are PINS PB5,PB6,PB7 or on Ardurino D11,D12,and D13
+  //Atmega1280/2560 can't use OCR1A, OCR1B and OCR1C
+  //These are pins PB5,PB6,PB7 or on Arduino D11,D12 and D13
     if((check_pin != 11) && (check_pin != 12) && (check_pin != 13))
     {
         analogWrite(check_pin, val);
@@ -1195,7 +1194,7 @@ FORCE_INLINE void process_commands()
             st_synchronize();
   
             current_position[X_AXIS] = (X_HOME_DIR == -1) ? 0 : X_MAX_LENGTH;
-            current_position[X_AXIS] += add_homeing[0];
+            current_position[X_AXIS] += add_homing[0];
             plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
             destination[X_AXIS] = current_position[X_AXIS];
             feedrate = 0;
@@ -1228,7 +1227,7 @@ FORCE_INLINE void process_commands()
             st_synchronize();
   
             current_position[Y_AXIS] = (Y_HOME_DIR == -1) ? 0 : Y_MAX_LENGTH;
-            current_position[Y_AXIS] += add_homeing[1];
+            current_position[Y_AXIS] += add_homing[1];
             plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
             destination[Y_AXIS] = current_position[Y_AXIS];
             feedrate = 0;
@@ -1261,7 +1260,7 @@ FORCE_INLINE void process_commands()
             st_synchronize();
   
             current_position[Z_AXIS] = (Z_HOME_DIR == -1) ? 0 : Z_MAX_LENGTH;
-            current_position[Z_AXIS] += add_homeing[2];
+            current_position[Z_AXIS] += add_homing[2];
             plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
             destination[Z_AXIS] = current_position[Z_AXIS];
             feedrate = 0;         
@@ -1579,7 +1578,7 @@ FORCE_INLINE void process_commands()
 	    }
       }
       break;
-      case 190: // M190 - Wait bed for heater to reach target.
+      case 190: // M190 - Wait for bed heater to reach target temperature.
       #if TEMP_1_PIN > -1
         if (code_seen('S')) target_bed_raw = temp2analogBed(code_value());
         codenum = millis(); 
@@ -1789,7 +1788,7 @@ FORCE_INLINE void process_commands()
           if(code_seen('S')) manage_monitor = code_value();
           if(manage_monitor==100) manage_monitor=1; // Set 100 to heated bed
       break;
-      case 204: // M204 acclereration S normal moves T filmanent only moves
+      case 204: // M204 acceleration S normal moves T filmanent only moves
           if(code_seen('S')) move_acceleration = code_value() ;
           if(code_seen('T')) retract_acceleration = code_value() ;
       break;
@@ -1801,10 +1800,10 @@ FORCE_INLINE void process_commands()
         if(code_seen('Z')) max_z_jerk = code_value() ;
         if(code_seen('E')) max_e_jerk = code_value() ;
       break;
-      case 206: // M206 additional homeing offset
+      case 206: // M206 additional homing offset
         for(int8_t cnt_i=0; cnt_i < 3; cnt_i++) 
         {
-          if(code_seen(axis_codes[cnt_i])) add_homeing[cnt_i] = code_value();
+          if(code_seen(axis_codes[cnt_i])) add_homing[cnt_i] = code_value();
         }
       break;  
       case 220: // M220 S<factor in percent>- set speed factor override percentage
@@ -2210,7 +2209,7 @@ void calculate_trapezoid_for_block(block_t *block, float entry_factor, float exi
   int32_t plateau_steps = block->step_event_count-accelerate_steps-decelerate_steps;
   
   // Is the Plateau of Nominal Rate smaller than nothing? That means no cruising, and we will
-  // have to use intersection_distance() to calculate when to abort acceleration and start braking
+  // have to use intersection_distance() to calculate when to abort acceleration and start breaking
   // in order to reach the final_rate exactly at the end of this block.
   if (plateau_steps < 0) {
     accelerate_steps = ceil(
@@ -2571,7 +2570,7 @@ void plan_buffer_line(float x, float y, float z, float e, float feed_rate)
     	if(feed_rate<minimumfeedrate) feed_rate=minimumfeedrate;
   } 
 
-  // slow down when de buffer starts to empty, rather than wait at the corner for a buffer refill
+  // slow down when the buffer starts to empty, rather than wait at the corner for a buffer refill
   int moves_queued=(block_buffer_head-block_buffer_tail + BLOCK_BUFFER_SIZE) & (BLOCK_BUFFER_SIZE - 1);
 #ifdef SLOWDOWN  
   if(moves_queued < (BLOCK_BUFFER_SIZE * 0.5) && moves_queued > 1) feed_rate = feed_rate*moves_queued / (BLOCK_BUFFER_SIZE * 0.5); 
@@ -2961,7 +2960,7 @@ static unsigned long step_events_completed; // The number of step events execute
 static short e_steps;
 static unsigned char busy = false; // TRUE when SIG_OUTPUT_COMPARE1A is being serviced. Used to avoid retriggering that handler.
 static long acceleration_time, deceleration_time;
-static unsigned short acc_step_rate; // needed for deccelaration start point
+static unsigned short acc_step_rate; // needed for deceleration start point
 static char step_loops;
 static unsigned short OCR1A_nominal;
 
@@ -2989,7 +2988,7 @@ static bool old_z_max_endstop=false;
 //
 //                           time ----->
 // 
-//  The trapezoid is the shape the speed curve over time. It starts at block->initial_rate, accelerates 
+//  The trapezoid is the shape of the speed curve over time. It starts at block->initial_rate, accelerates 
 //  first block->accelerate_until step_events_completed, then keeps going at constant speed until 
 //  step_events_completed reaches block->decelerate_after after which it decelerates until the trapezoid generator is reset.
 //  The slope of acceleration is calculated with the leib ramp alghorithm.
@@ -3090,7 +3089,7 @@ ISR(TIMER1_COMPA_vect)
     // Set directions TO DO This should be done once during init of trapezoid. Endstops -> interrupt
     out_bits = current_block->direction_bits;
 
-    // Set direction en check limit switches
+    // Set direction and check limit switches
     if ((out_bits & (1<<X_AXIS)) != 0) {   // -direction
       WRITE(X_DIR_PIN, INVERT_X_DIR);
       CHECK_ENDSTOPS