Tools: Fix typos

Tools/APM2_2560_bootloader/Makefile

@@ -91,7 +91,7 @@ DEBUG = dwarf-2
 
 
 # List any extra directories to look for include files here.
-#     Each directory must be seperated by a space.
+#     Each directory must be separated by a space.
 #     Use forward slashes for directory separators.
 #     For a directory that has spaces, enclose it in quotes.
 EXTRAINCDIRS = 

Tools/APM2_2560_bootloader/stk500boot.c

@@ -656,9 +656,9 @@ int main(void)
 					if (exPointCntr == 3)
 					{
 						RunMonitor();
-						exPointCntr		=	0;	//	reset back to zero so we dont get in an endless loop
+						exPointCntr		=	0;	//	reset back to zero so we don't get in an endless loop
 						isLeave			=	1;
-						msgParseState	=	99;	//*	we dont want it do anything
+						msgParseState	=	99;	//*	we don't want it do anything
 						break;
 					}
 				}
@@ -836,7 +836,7 @@ int main(void)
 
 				case CMD_LEAVE_PROGMODE_ISP:
 					isLeave	=	1;
-					//*	fall thru
+					//*	fall through
 
 				case CMD_SET_PARAMETER:
 				case CMD_ENTER_PROGMODE_ISP:

Tools/ArduPPM/ATMega328p/manual.txt

@@ -20,7 +20,7 @@ Emphasis has been put on code simplicity and reliability.
 
 Code has not yet been massively tested in the field.
 
-Nevertheless extensive tests have been done in the lab with a limited set of different receivers, and a limited number of users did report very sucessfull results.
+Nevertheless extensive tests have been done in the lab with a limited set of different receivers, and a limited number of users did report very successful results.
 
 
 Carefully check that your radio is working perfectly before you fly.

Tools/ArduPPM/ATMega32U2/Bootloaders/arduino-usbdfu/makefile

@@ -177,7 +177,7 @@ DEBUG = dwarf-2
 
 
 # List any extra directories to look for include files here.
-#     Each directory must be seperated by a space.
+#     Each directory must be separated by a space.
 #     Use forward slashes for directory separators.
 #     For a directory that has spaces, enclose it in quotes.
 EXTRAINCDIRS = $(LUFA_PATH)/
@@ -316,7 +316,7 @@ MATH_LIB = -lm
 
 
 # List any extra directories to look for libraries here.
-#     Each directory must be seperated by a space.
+#     Each directory must be separated by a space.
 #     Use forward slashes for directory separators.
 #     For a directory that has spaces, enclose it in quotes.
 EXTRALIBDIRS = 

Tools/ArduPPM/ATMega32U2/LUFA/Doxygen.conf

@@ -291,7 +291,7 @@ TYPEDEF_HIDES_STRUCT   = YES
 # causing a significant performance penality.
 # If the system has enough physical memory increasing the cache will improve the
 # performance by keeping more symbols in memory. Note that the value works on
-# a logarithmic scale so increasing the size by one will rougly double the
+# a logarithmic scale so increasing the size by one will roughly double the
 # memory usage. The cache size is given by this formula:
 # 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0,
 # corresponding to a cache size of 2^16 = 65536 symbols

Tools/ArduPPM/ATMega32U2/LUFA/ManPages/BuildingLinkableLibraries.txt

@@ -6,7 +6,7 @@
 
 /** \page Page_BuildLibrary Building as a Linkable Library
  *
- *  The LUFA library can be built as a proper linkable library (with the extention .a) under AVR-GCC, so that
+ *  The LUFA library can be built as a proper linkable library (with the extension .a) under AVR-GCC, so that
  *  the library does not need to be recompiled with each revision of a user project. Instructions for creating
  *  a library from a given source tree can be found in the AVR-GCC user manual included in the WinAVR install
  *  /Docs/ directory.

Tools/ArduPPM/ATMega32U2/LUFA/ManPages/ChangeLog.txt

@@ -436,7 +436,7 @@
   *    of device configurations can be defined statically
   *  - Removed VBUS events, as they are already exposed to the user application via the regular device connection and disconnection events
   *  - Renamed and altered existing events to properly separate out Host and Device mode events
-  *  - All demos switched over from GNU99 standards mode to C99 standards mode, to reduce the dependancies on GCC-only language extensions
+  *  - All demos switched over from GNU99 standards mode to C99 standards mode, to reduce the dependencies on GCC-only language extensions
   *
   *  <b>Fixed:</b>
   *  - Changed bootloaders to use FLASHEND rather than the existence of RAMPZ to determine if far FLASH pointers are needed to fix
@@ -978,7 +978,7 @@
   *  - AVR_HOST_GetDeviceConfigDescriptor routine no longer modifies ConfigSizePtr if a valid buffer
   *    pointer is passed
   *  - Added ALLOCABLE_BYTES to DynAlloc, and added code to make the size of key storage variables
-  *    dependant on size of memory parameters passed in via the user project's makefile
+  *    dependent on size of memory parameters passed in via the user project's makefile
   *  - Fixed incorrect device reset routine being called in USBTask
   *  - Devices which do not connect within the standard 300mS are now supported
   *  - Removed incorrect ATTR_PURE from Scheduler_SetTaskMode(), which was preventing tasks from being

Tools/ArduPPM/ATMega32U2/LUFA/Scheduler/Scheduler.h

@@ -197,7 +197,7 @@
 
 		/* Inline Functions: */
 			/** Resets the delay counter value to the current tick count. This should be called to reset the period
-			 *  for a delay in a task which is dependant on the current tick value.
+			 *  for a delay in a task which is dependent on the current tick value.
 			 *
 			 *  \param[out] DelayCounter  Counter which is storing the starting tick count for a given delay.
 			 */

Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/makefile

@@ -191,7 +191,7 @@ DEBUG = dwarf-2
 
 
 # List any extra directories to look for include files here.
-#     Each directory must be seperated by a space.
+#     Each directory must be separated by a space.
 #     Use forward slashes for directory separators.
 #     For a directory that has spaces, enclose it in quotes.
 EXTRAINCDIRS = $(LUFA_PATH)/
@@ -332,7 +332,7 @@ MATH_LIB = -lm
 
 
 # List any extra directories to look for libraries here.
-#     Each directory must be seperated by a space.
+#     Each directory must be separated by a space.
 #     Use forward slashes for directory separators.
 #     For a directory that has spaces, enclose it in quotes.
 EXTRALIBDIRS = 

Tools/ArduPPM/Libraries/PPM_Encoder.h

@@ -45,7 +45,7 @@
 // V2.2.3 - Implemented 0.5us cut filter to remove servo input capture jitter.
 
 // 04-08-2011
-// V2.2.4 - Implemented PPM passtrough funtion.
+// V2.2.4 - Implemented PPM passtrough function.
 //          Shorting channel 2&3 enabled ppm passtrough on channel 1.
 
 // 04-08-2011

Tools/ArduPPM/Libraries/PPM_Encoder_v3.h

@@ -61,7 +61,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 // -------------------------------------------------------------
 
 #define SWITCHOVER_CHANNEL_A		9	// Receiver 1 PPM channel to force receiver 2. Use 0 for no switchover channel
-										// Must be choosed between 6 to 16. Preferabily from 9 to 16 so that APM can use
+										// Must be chosen between 6 to 16. Preferabily from 9 to 16 so that APM can use
 										// channels 1 to 8.
 
 
@@ -113,7 +113,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH1_VAL_CENTER      TICKS_FOR_ONE_US * 1520
 #define PPM_CH1_FORCE_VAL_MIN	1800
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		400
 
 // PPM frame sync symbol limits
@@ -136,7 +136,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH1_VAL_CENTER      TICKS_FOR_ONE_US * 760
 #define PPM_CH1_FORCE_VAL_MIN	900
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		200
 
 // PPM frame sync symbol limits
@@ -159,7 +159,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH1_VAL_CENTER      TICKS_FOR_ONE_US * 1050
 #define PPM_CH1_FORCE_VAL_MIN	1260
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		400
 
 // PPM frame sync symbol limits
@@ -195,7 +195,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH2_VAL_MAX         TICKS_FOR_ONE_US * 2120
 #define PPM_CH2_VAL_CENTER      TICKS_FOR_ONE_US * 1520
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		400
 
 // PPM frame sync symbol limits
@@ -217,7 +217,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH2_VAL_MAX         TICKS_FOR_ONE_US * 1060
 #define PPM_CH2_VAL_CENTER      TICKS_FOR_ONE_US * 760
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		200
 
 // PPM sync symbol limits
@@ -239,7 +239,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
 #define PPM_CH2_VAL_MAX         TICKS_FOR_ONE_US * 1350
 #define PPM_CH2_VAL_CENTER      TICKS_FOR_ONE_US * 1050
 
-// PPM channel pre pulse lenght
+// PPM channel pre pulse length
 #define PPM_CH1_CHANNEL_PREPULSE_LENGHT		400
 
 // PPM sync symbol limits
@@ -618,9 +618,9 @@ ISR( SERVO_INT_VECTOR )
 		// PPM2 pulse start time
 		static uint16_t ppm2_start[ 16 ] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
 		
-		// PPM1 pulse lenght
+		// PPM1 pulse length
 		static uint16_t ppm1_width[ 16 ] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-		// PPM2 pulse lenght
+		// PPM2 pulse length
 		static uint16_t ppm2_width[ 16 ] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
 				
 		// Reset PPM channels ( 0 = Sync Symbol )
@@ -692,9 +692,9 @@ ISR( SERVO_INT_VECTOR )
 			// Check if we've got a high level (raising edge, channel start or sync symbol end)
 			if( servo_pins & 1 )
 			{
-				// Check for pre pulse lenght
+				// Check for pre pulse length
 				ppm1_prepulse_width = servo_time - ppm1_prepulse_start;
-				if ( true ) //Todo optionnal: We could add a test here for channel pre pulse lenght check
+				if ( true ) //Todo optionnal: We could add a test here for channel pre pulse length check
 				{
 					//We have a valid pre pulse
 					if( ppm1_channel ==  channel_count_ch1 ) // Check for last channel
@@ -721,16 +721,16 @@ ISR( SERVO_INT_VECTOR )
 			// -----------------------------------------------------------------------------------------------------------------------
 			else // We've got a low level (falling edge, channel end or sync symbol start)
 			{
-				ppm1_width[ ppm1_channel ] = servo_time - ppm1_start[ ppm1_channel ]; // Calculate channel pulse lenght, or sync symbol lenght
+				ppm1_width[ ppm1_channel ] = servo_time - ppm1_start[ ppm1_channel ]; // Calculate channel pulse length, or sync symbol length
 				if(sync_ch1 == true) // Are we synchronized ?
 				{
-					// Check channel pulse lenght validity
-					if( ppm1_width[ ppm1_channel ] > ( PPM_CH1_VAL_MAX - PPM_CH1_CHANNEL_PREPULSE_LENGHT ) ) || ( ppm1_width[ ppm1_channel ] < ( PPM_CH1_VAL_MIN - PPM_CH1_CHANNEL_PREPULSE_LENGHT ) ) // If we have a valid pulse lenght
+					// Check channel pulse length validity
+					if( ppm1_width[ ppm1_channel ] > ( PPM_CH1_VAL_MAX - PPM_CH1_CHANNEL_PREPULSE_LENGHT ) ) || ( ppm1_width[ ppm1_channel ] < ( PPM_CH1_VAL_MIN - PPM_CH1_CHANNEL_PREPULSE_LENGHT ) ) // If we have a valid pulse length
 					{
 						// Reset channel error flag
 						channel_error_ch1 = false;
 					}
-					else	// We do not have a valid channel lenght
+					else	// We do not have a valid channel length
 					{
 						if( ppm1_width[ ppm1_channel ] > PPM_CH1_MIN_SYNC_LENGHT ) || ( ppm1_width[ ppm1_channel ] < PPM_CH1_MAX_SYNC_LENGHT ) //Check for sync symbol
 						{
@@ -791,9 +791,9 @@ ISR( SERVO_INT_VECTOR )
 			// Check if we've got a high level (raising edge, channel start or sync symbol end)
 			if( servo_pins & 2 )
 			{
-				// Check for pre pulse lenght
+				// Check for pre pulse length
 				ppm2_prepulse_width = servo_time - ppm2_prepulse_start;
-				if ( true ) //Todo optionnal: We could add a test here for channel pre pulse lenght check
+				if ( true ) //Todo optionnal: We could add a test here for channel pre pulse length check
 				{
 					//We have a valid pre pulse
 					if( ppm2_channel ==  channel_count_ch2 ) // Check for last channel
@@ -820,16 +820,16 @@ ISR( SERVO_INT_VECTOR )
 			// -----------------------------------------------------------------------------------------------------------------------
 			else // We've got a low level (falling edge, channel end or sync symbol start)
 			{
-				ppm2_width[ ppm2_channel ] = servo_time - ppm2_start[ ppm2_channel ]; // Calculate channel pulse lenght, or sync symbol lenght
+				ppm2_width[ ppm2_channel ] = servo_time - ppm2_start[ ppm2_channel ]; // Calculate channel pulse length, or sync symbol length
 				if(sync_ch2 == true) // Are we synchronized ?
 				{
-					// Check channel pulse lenght validity
-					if( ppm2_width[ ppm2_channel ] > ( PPM_CH2_VAL_MAX - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) || ( ppm2_width[ ppm2_channel ] < ( PPM_CH2_VAL_MIN - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) // If we have a valid pulse lenght
+					// Check channel pulse length validity
+					if( ppm2_width[ ppm2_channel ] > ( PPM_CH2_VAL_MAX - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) || ( ppm2_width[ ppm2_channel ] < ( PPM_CH2_VAL_MIN - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) // If we have a valid pulse length
 					{
 						// Reset channel error flag
 						channel_error_ch2 = false;
 					}
-					else	// We do not have a valid channel lenght
+					else	// We do not have a valid channel length
 					{
 						if( ppm2_width[ ppm2_channel ] > PPM_CH2_MIN_SYNC_LENGHT ) || ( ppm2_width[ ppm2_channel ] < PPM_CH2_MAX_SYNC_LENGHT ) //Check for sync symbol
 						{

Tools/ArduPPM/Libraries/changelog_v3.txt

@@ -15,7 +15,7 @@
 // V2.2.3 - Implemented 0.5us cut filter to remove servo input capture jitter.
 
 // 04-08-2011
-// V2.2.4 - Implemented PPM passtrough funtion.
+// V2.2.4 - Implemented PPM passtrough function.
 //          Shorting channel 2&3 enabled ppm passtrough on channel 1.
 
 // 04-08-2011

Tools/ArduPPM/WorkBasket/Experimental/PPM_Encoder.h

@@ -17,7 +17,7 @@
 // V2.2.3 - Implemented 0.5us cut filter to remove servo input capture jitter.
 
 // 04-08-2011
-// V2.2.4 - Implemented PPM passtrough funtion.
+// V2.2.4 - Implemented PPM passtrough function.
 //          Shorting channel 2&3 enabled ppm passtrough on channel 1.
 
 // 04-08-2011
@@ -842,7 +842,7 @@ void ppm_encoder_init( void )
         uint16_t input_channel_count[ SERVO_CHANNELS ];
         uint8_t input_current; // Input pin level mask
         uint8_t input_previous; // Input pin level mask
-        uint8_t input_int_mask; // Active input pin interupt mask
+        uint8_t input_int_mask; // Active input pin interrupt mask
         
     INPUT_ACTIVE_CHANNEL_CHECK:
 
@@ -897,7 +897,7 @@ void ppm_encoder_init( void )
                 // Set active channel in servo_input_connected[..]
                 servo_input_connected[ (input_channel << 1) + 1 ] = true;    
                 
-                // Set interupt pin mask for active channel
+                // Set interrupt pin mask for active channel
                 input_int_mask |= 1 << input_channel;
 
             }

Tools/ArduPPM/WorkBasket/readme.txt

@@ -1,5 +1,5 @@
 
-The ArduPPM "Workbasket" is a source of code or tools usefull for ppm encoder projects.
+The ArduPPM "Workbasket" is a source of code or tools useful for ppm encoder projects.
 
 
 It is recommanded to delete no more needed stuff when integration in the ArduPPM code has been done to keep the repository size smaller.

Tools/ArduPPM/WorkBasket/spektrum_to_ppm_encoder/spektrum_to_ppm_encoder.pde

@@ -32,7 +32,7 @@
 	
 		#define baud_setting 16	// See page 231 of the data sheet
 
-		// Comment - this software rearranges the channel order from the tranmsitter to match APM useage
+		// Comment - this software rearranges the channel order from the tranmsitter to match APM usage
 		//			Ch1 = Aileron = Spectrum Ch2
 		//			Ch2 = Elevator = Spectrum Ch3
 		//			Ch3 = Throttle = Spectrum Ch1
@@ -184,7 +184,7 @@ ISR(TIMER1_COMPA_vect) {
 			falling_edge = TRUE;
 			ch_index++;
 		} else {
-			// set timer top to max to minimize interupt execution when not sending a frame
+			// set timer top to max to minimize interrupt execution when not sending a frame
 			OCR1A = 0xffff;
 		}
 	} else {
@@ -193,7 +193,7 @@ ISR(TIMER1_COMPA_vect) {
 			OCR1A = 4800;			//16 * 300,  300 usec negative going pulse width;
 			falling_edge = FALSE;
 		} else {
-			// set timer top to max to minimize interupt execution when not sending a frame
+			// set timer top to max to minimize interrupt execution when not sending a frame
 			OCR1A = 0xffff;
 		}
 	}

Tools/Linux_HAL_Essentials/RCInput_UART/pic_firmware.asm

@@ -34,7 +34,7 @@
 
     cblock 0x020
     ; input_value, input_rise and input_mirror
-    ; are at the bank's begining to make easy
+    ; are at the bank's beginning to make easy
     ; the exchange of data between them.
     input_value:(INPUT_NUM * 2)
     input_previous
@@ -364,7 +364,7 @@ ClearBank:
     ; clears the gpr bank pointed by w plus irp,
     ; but preserves the common 16 bytes.
 
-    ; ensure the begining of the bank
+    ; ensure the beginning of the bank
     andlw   b'10100000'
     movwf   FSR
     movlw   .80

Tools/LogAnalyzer/LogAnalyzer.py

@@ -189,12 +189,12 @@ class TestSuite(object):
                 print >>xml, "    <name>" + escape(test.name) + "</name>"
                 print >>xml, "    <status>FAIL</status>"
                 print >>xml, "    <message>" + escape(test.result.statusMessage) + "</message>"
-                print >>xml, "    <data>(test data will be embeded here at some point)</data>"
+                print >>xml, "    <data>(test data will be embedded here at some point)</data>"
             elif test.result.status == TestResult.StatusType.WARN:
                 print >>xml, "    <name>" + escape(test.name) + "</name>"
                 print >>xml, "    <status>WARN</status>"
                 print >>xml, "    <message>" + escape(test.result.statusMessage) + "</message>"
-                print >>xml, "    <data>(test data will be embeded here at some point)</data>"
+                print >>xml, "    <data>(test data will be embedded here at some point)</data>"
             elif test.result.status == TestResult.StatusType.NA:
                 print >>xml, "    <name>" + escape(test.name) + "</name>"
                 print >>xml, "    <status>NA</status>"

Tools/LogAnalyzer/example_output.xml

@@ -313,13 +313,13 @@
     <name>Event/Failsafe</name>
     <status>FAIL</status>
     <message>ERR found: GPS </message>
-    <data>(test data will be embeded here at some point)</data>
+    <data>(test data will be embedded here at some point)</data>
   </result>
   <result>
     <name>GPS</name>
     <status>WARN</status>
     <message>Min satellites: 6, Max HDop: 4.68</message>
-    <data>(test data will be embeded here at some point)</data>
+    <data>(test data will be embedded here at some point)</data>
   </result>
   <result>
     <name>Parameters</name>
@@ -330,7 +330,7 @@
     <name>PM</name>
     <status>FAIL</status>
     <message>14 slow loop lines found, max 18.56% on line 2983</message>
-    <data>(test data will be embeded here at some point)</data>
+    <data>(test data will be embedded here at some point)</data>
   </result>
   <result>
     <name>Pitch/Roll</name>

Tools/SerialProxy/SerialProxy/Form1.cs

@@ -47,7 +47,7 @@ namespace SerialProxy
                 try
                 {
                     comPort.PortName = Comports.Text.ToString();
-                    comPort.DtrEnable = false; // dont reset yet
+                    comPort.DtrEnable = false; // don't reset yet
                     comPort.Open();
                     StatusCom.Text = "Com Connected";
                     ConnectComPort.Text = "Disconnect";

Tools/autotest/aircraft/Rascal/README.Rascal

@@ -135,7 +135,7 @@ tires.
 rudder which is connected to a steerable tail wheel.  Use brakes only
 for positive, precision ground control when necessary.
 
-(3) Taxi upwind with stick back; downwind with stick foreward.  When
+(3) Taxi upwind with stick back; downwind with stick forward.  When
 ground winds are in excess of 15 M.P.H., turn into wind using ailerons
 in direction of turn; apply ailerons away from the turn when turning
 downwind.  This procedure helps to prevent the wind "picking up" a

Tools/autotest/pysim/fdpexpect.py

@@ -1,5 +1,5 @@
 """This is like pexpect, but will work on any file descriptor that you pass it.
-So you are reponsible for opening and close the file descriptor.
+So you are responsible for opening and close the file descriptor.
 
 $Id: fdpexpect.py 505 2007-12-26 21:33:50Z noah $
 """

Tools/autotest/pysim/util.py

@@ -422,7 +422,7 @@ def apparent_wind(wind_sp, obj_speed, alpha):
 # (let's assume it's low, .e.g., 0.2), p : density of air (assume about 1
 # kg/m^3, the density just over 1500m elevation), v : relative speed of wind
 # (to the body), a : area acted on (this is captured by the cross_section
-# paramter).
+# parameter).
 # 
 # So then we have 
 # F(a) = 0.2 * 1/2 * v^2 * cross_section = 0.1 * v^2 * cross_section

Tools/autotest/sim_vehicle.py

@@ -599,7 +599,7 @@ def start_mavproxy(opts, stuff):
     if opts.mavproxy_args:
         cmd.extend(opts.mavproxy_args.split(" ")) # this could be a lot better..
 
-    # compatability pass-through parameters (for those that don't want
+    # compatibility pass-through parameters (for those that don't want
     # to use -C :-)
     for out in opts.out:
         cmd.extend(['--out', out])

Tools/autotest/web-firmware/index.html

@@ -171,8 +171,8 @@ python px_uploader.py --port /dev/ttyACM0 px4fmu.px4
 After starting the script, press the reset button on your PX4FMU to
 make it enter bootloader mode.
 
-<h2>Building the firmware youself</h2>
-To build the firmware youself please see the <a href="http://dev.ardupilot.com">ArduPilot development site</a>.
+<h2>Building the firmware yourself</h2>
+To build the firmware yourself please see the <a href="http://dev.ardupilot.com">ArduPilot development site</a>.
 
 </div>
 </body>