Merge pull request #413 from per1234/ci

Use GitHub Actions for continuous integration

39 files changed, 373 insertions, 78 deletions

diff --git a/.codespellrc b/.codespellrc
new file mode 100644
index 0000000..6aace1d
--- /dev/null
+++ b/.codespellrc
@@ -0,0 +1,7 @@
+# See: https://github.com/codespell-project/codespell#using-a-config-file
+[codespell]
+# In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:
+ignore-words-list = hart,pullrequest
+check-filenames =
+check-hidden =
+skip = ./.git,./firmwares/arduinoISP,./firmwares/wifishield,./bootloaders
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..03600dd
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+# See: https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#about-the-dependabotyml-file
+version: 2
+
+updates:
+  # Configure check for outdated GitHub Actions actions in workflows.
+  # See: https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot
+  - package-ecosystem: github-actions
+    directory: / # Check the repository's workflows under /.github/workflows/
+    schedule:
+      interval: daily
diff --git a/.github/workflows/check-arduino.yml b/.github/workflows/check-arduino.yml
new file mode 100644
index 0000000..cfffb75
--- /dev/null
+++ b/.github/workflows/check-arduino.yml
@@ -0,0 +1,27 @@
+name: Check Arduino
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by new rules added to Arduino Lint.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Arduino Lint
+        uses: arduino/arduino-lint-action@v1
+        with:
+          compliance: specification
+          # Always use this setting for official repositories. Remove for 3rd party projects.
+          official: true
+          project-type: platform
diff --git a/.github/workflows/compile-platform-examples.yml b/.github/workflows/compile-platform-examples.yml
new file mode 100644
index 0000000..8e8f5b5
--- /dev/null
+++ b/.github/workflows/compile-platform-examples.yml
@@ -0,0 +1,206 @@
+name: Compile Examples
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/compile-platform-examples.ya?ml"
+      - "cores/**"
+      - "libraries/**"
+      - "variants/**"
+      - "boards.txt"
+      - "platform.txt"
+  pull_request:
+    paths:
+      - ".github/workflows/compile-platform-examples.ya?ml"
+      - "cores/**"
+      - "libraries/**"
+      - "variants/**"
+      - "boards.txt"
+      - "platform.txt"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  build:
+    name: ${{ matrix.board.fqbn }}
+    runs-on: ubuntu-latest
+
+    env:
+      SKETCHES_REPORTS_PATH: sketches-reports
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        board:
+          - fqbn: arduino:avr:yun
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:uno
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:diecimila:cpu=atmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:diecimila:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:nano:cpu=atmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:nano:cpu=atmega328old
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:nano:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:mega:cpu=atmega2560
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:mega:cpu=atmega1280
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:megaADK
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:leonardo
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:leonardoeth
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:micro
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:esplora
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:mini:cpu=atmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:mini:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:ethernet
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:fio
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:bt:cpu=atmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:bt:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:LilyPadUSB
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:lilypad:cpu=atmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:lilypad:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:pro:cpu=16MHzatmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:pro:cpu=8MHzatmega328
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:pro:cpu=16MHzatmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:pro:cpu=8MHzatmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:atmegang:cpu=atmega168
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:atmegang:cpu=atmega8
+            serial: true
+            softwareserial: false
+          - fqbn: arduino:avr:robotControl
+            serial: true
+            softwareserial: false
+          - fqbn: arduino:avr:robotMotor
+            serial: true
+            softwareserial: false
+          - fqbn: arduino:avr:gemma
+            serial: false
+            softwareserial: false
+          - fqbn: arduino:avr:circuitplay32u4cat
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:yunmini
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:chiwawa
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:one
+            serial: true
+            softwareserial: true
+          - fqbn: arduino:avr:unowifi
+            serial: true
+            softwareserial: true
+
+        # Make board type-specific customizations to the matrix jobs
+        include:
+          - board:
+              # Boards with Serial interface
+              serial: true
+            # Compile these sketches in addition to the ones compiled for all boards
+            serial-sketch-paths: |
+              - libraries/EEPROM/examples/eeprom_crc
+              - libraries/EEPROM/examples/eeprom_get
+              - libraries/EEPROM/examples/eeprom_put
+              - libraries/EEPROM/examples/eeprom_read
+              - libraries/SPI
+              - libraries/Wire
+          - board:
+              serial: false
+            serial-sketch-paths: ""
+          - board:
+              # Boards compatible with the SoftwareSerial library
+              softwareserial: true
+            softwareserial-sketch-paths: |
+              - libraries/SoftwareSerial
+          - board:
+              softwareserial: false
+            softwareserial-sketch-paths: ""
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Compile examples
+        uses: arduino/compile-sketches@v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          fqbn: ${{ matrix.board.fqbn }}
+          platforms: |
+            # Use Boards Manager to install the latest release of the platform to get the toolchain.
+            - name: arduino:avr
+            # Overwrite the Boards Manager installation with the platform from the repository.
+            - source-path: ./
+              name: arduino:avr
+          sketch-paths: |
+            # Compile these sketches for all boards
+            - libraries/EEPROM/examples/eeprom_clear
+            - libraries/EEPROM/examples/eeprom_iteration
+            - libraries/EEPROM/examples/eeprom_update
+            - libraries/EEPROM/examples/eeprom_write
+            # Board-specific sketches
+            ${{ matrix.serial-sketch-paths }}
+            ${{ matrix.softwareserial-sketch-paths }}
+          enable-deltas-report: true
+          sketches-report-path: ${{ env.SKETCHES_REPORTS_PATH }}
+
+      - name: Save sketches report as workflow artifact
+        uses: actions/upload-artifact@v2
+        with:
+          if-no-files-found: error
+          path: ${{ env.SKETCHES_REPORTS_PATH }}
+          name: ${{ env.SKETCHES_REPORTS_PATH }}
diff --git a/.github/workflows/report-size-deltas.yml b/.github/workflows/report-size-deltas.yml
new file mode 100644
index 0000000..652be5d
--- /dev/null
+++ b/.github/workflows/report-size-deltas.yml
@@ -0,0 +1,24 @@
+name: Report Size Deltas
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/report-size-deltas.yml"
+  schedule:
+    # Run at the minimum interval allowed by GitHub Actions.
+    # Note: GitHub Actions periodically has outages which result in workflow failures.
+    # In this event, the workflows will start passing again once the service recovers.
+    - cron: "*/5 * * * *"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  report:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Comment size deltas reports to PRs
+        uses: arduino/report-size-deltas@v1
+        with:
+          # The name of the workflow artifact created by the sketch compilation workflow
+          sketches-reports-source: sketches-reports
diff --git a/.github/workflows/spell-check.yml b/.github/workflows/spell-check.yml
new file mode 100644
index 0000000..01bee87
--- /dev/null
+++ b/.github/workflows/spell-check.yml
@@ -0,0 +1,22 @@
+name: Spell Check
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch new misspelling detections resulting from dictionary updates.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  spellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Spell check
+        uses: codespell-project/actions-codespell@master
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..42a1f04
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+# Arduino AVR Boards
+
+[![Check Arduino status](https://github.com/arduino/ArduinoCore-avr/actions/workflows/check-arduino.yml/badge.svg)](https://github.com/arduino/ArduinoCore-avr/actions/workflows/check-arduino.yml)
+[![Compile Examples status](https://github.com/arduino/ArduinoCore-avr/actions/workflows/compile-platform-examples.yml/badge.svg)](https://github.com/arduino/ArduinoCore-avr/actions/workflows/compile-platform-examples.yml)
+[![Spell Check status](https://github.com/arduino/ArduinoCore-avr/actions/workflows/spell-check.yml/badge.svg)](https://github.com/arduino/ArduinoCore-avr/actions/workflows/spell-check.yml)
+
+This repository contains the source code and configuration files of the Arduino AVR Boards
+[platform](https://arduino.github.io/arduino-cli/latest/platform-specification/).
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index e99d503..561127f 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -219,7 +219,7 @@ void HardwareSerial::flush()
 	  _tx_udr_empty_irq();
   }
   // If we get here, nothing is queued anymore (DRIE is disabled) and
-  // the hardware finished tranmission (TXC is set).
+  // the hardware finished transmission (TXC is set).
 }
 
 size_t HardwareSerial::write(uint8_t c)
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 17000c2..6ff29d0 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -32,7 +32,7 @@
 // using a ring buffer (I think), in which head is the index of the location
 // to which to write the next incoming character and tail is the index of the
 // location from which to read.
-// NOTE: a "power of 2" buffer size is reccomended to dramatically
+// NOTE: a "power of 2" buffer size is recommended to dramatically
 //       optimize all the modulo operations for ring buffers.
 // WARNING: When buffer sizes are increased to > 256, the buffer index
 // variables are automatically increased in size, but the extra
diff --git a/cores/arduino/HardwareSerial_private.h b/cores/arduino/HardwareSerial_private.h
index 761a5e5..2e23cec 100644
--- a/cores/arduino/HardwareSerial_private.h
+++ b/cores/arduino/HardwareSerial_private.h
@@ -63,7 +63,7 @@
 #endif
 #endif // !defined TXC0
 
-// Check at compiletime that it is really ok to use the bit positions of
+// Check at compile time that it is really ok to use the bit positions of
 // UART0 for the other UARTs as well, in case these values ever get
 // changed for future hardware.
 #if defined(TXC1) && (TXC1 != TXC0 || RXEN1 != RXEN0 || RXCIE1 != RXCIE0 || \
diff --git a/cores/arduino/Print.h b/cores/arduino/Print.h
index 058a2ab..0097cc1 100644
--- a/cores/arduino/Print.h
+++ b/cores/arduino/Print.h
@@ -59,7 +59,7 @@ class Print
     }
 
     // default to zero, meaning "a single write may block"
-    // should be overriden by subclasses with buffering
+    // should be overridden by subclasses with buffering
     virtual int availableForWrite() { return 0; }
 
     size_t print(const __FlashStringHelper *);
diff --git a/cores/arduino/Stream.h b/cores/arduino/Stream.h
index 8e950c7..21a247a 100644
--- a/cores/arduino/Stream.h
+++ b/cores/arduino/Stream.h
@@ -25,7 +25,7 @@
 #include <inttypes.h>
 #include "Print.h"
 
-// compatability macros for testing
+// compatibility macros for testing
 /*
 #define   getInt()            parseInt()
 #define   getInt(ignore)    parseInt(ignore)
diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 701a14f..3ff1459 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -32,7 +32,7 @@ typedef unsigned long u32;
 
 #include "Arduino.h"
 
-// This definitions is usefull if you want to reduce the EP_SIZE to 16
+// This definitions is useful if you want to reduce the EP_SIZE to 16
 // at the moment only 64 and 16 as EP_SIZE for all EPs are supported except the control endpoint
 #ifndef USB_EP_SIZE
 #define USB_EP_SIZE 64
diff --git a/cores/arduino/WString.h b/cores/arduino/WString.h
index 77709c3..2cf4cd7 100644
--- a/cores/arduino/WString.h
+++ b/cores/arduino/WString.h
@@ -95,7 +95,7 @@ public:
 
 	// returns true on success, false on failure (in which case, the string
 	// is left unchanged).  if the argument is null or invalid, the
-	// concatenation is considered unsucessful.
+	// concatenation is considered unsuccessful.
 	unsigned char concat(const String &str);
 	unsigned char concat(const char *cstr);
 	unsigned char concat(char c);
@@ -152,7 +152,7 @@ public:
 	unsigned char startsWith(const String &prefix, unsigned int offset) const;
 	unsigned char endsWith(const String &suffix) const;
 
-	// character acccess
+	// character access
 	char charAt(unsigned int index) const;
 	void setCharAt(unsigned int index, char c);
 	char operator [] (unsigned int index) const;
diff --git a/cores/arduino/new.cpp b/cores/arduino/new.cpp
index 9047b2d..7ca4931 100644
--- a/cores/arduino/new.cpp
+++ b/cores/arduino/new.cpp
@@ -18,7 +18,7 @@
 
 #include "new.h"
 
-// The C++ spec dicates that allocation failure should cause the
+// The C++ spec dictates that allocation failure should cause the
 // (non-nothrow version of the) operator new to throw an exception.
 // Since we expect to have exceptions disabled, it would be more
 // appropriate (and probably standards-compliant) to terminate instead.
diff --git a/cores/arduino/wiring.c b/cores/arduino/wiring.c
index 9727135..8caf455 100644
--- a/cores/arduino/wiring.c
+++ b/cores/arduino/wiring.c
@@ -125,7 +125,7 @@ void delayMicroseconds(unsigned int us)
 	// 2 microseconds) gives delays longer than desired.
 	//delay_us(us);
 #if F_CPU >= 24000000L
-	// for the 24 MHz clock for the aventurous ones, trying to overclock
+	// for the 24 MHz clock for the adventurous ones trying to overclock
 
 	// zero delay fix
 	if (!us) return; //  = 3 cycles, (4 when true)
@@ -135,9 +135,9 @@ void delayMicroseconds(unsigned int us)
 	// delay requested.
 	us *= 6; // x6 us, = 7 cycles
 
-	// account for the time taken in the preceeding commands.
+	// account for the time taken in the preceding commands.
 	// we just burned 22 (24) cycles above, remove 5, (5*4=20)
-	// us is at least 6 so we can substract 5
+	// us is at least 6 so we can subtract 5
 	us -= 5; //=2 cycles
 
 #elif F_CPU >= 20000000L
@@ -157,9 +157,9 @@ void delayMicroseconds(unsigned int us)
 	// delay requested.
 	us = (us << 2) + us; // x5 us, = 7 cycles
 
-	// account for the time taken in the preceeding commands.
+	// account for the time taken in the preceding commands.
 	// we just burned 26 (28) cycles above, remove 7, (7*4=28)
-	// us is at least 10 so we can substract 7
+	// us is at least 10 so we can subtract 7
 	us -= 7; // 2 cycles
 
 #elif F_CPU >= 16000000L
@@ -174,9 +174,9 @@ void delayMicroseconds(unsigned int us)
 	// delay requested.
 	us <<= 2; // x4 us, = 4 cycles
 
-	// account for the time taken in the preceeding commands.
+	// account for the time taken in the preceding commands.
 	// we just burned 19 (21) cycles above, remove 5, (5*4=20)
-	// us is at least 8 so we can substract 5
+	// us is at least 8 so we can subtract 5
 	us -= 5; // = 2 cycles,
 
 #elif F_CPU >= 12000000L
@@ -191,9 +191,9 @@ void delayMicroseconds(unsigned int us)
 	// delay requested.
 	us = (us << 1) + us; // x3 us, = 5 cycles
 
-	// account for the time taken in the preceeding commands.
+	// account for the time taken in the preceding commands.
 	// we just burned 20 (22) cycles above, remove 5, (5*4=20)
-	// us is at least 6 so we can substract 5
+	// us is at least 6 so we can subtract 5
 	us -= 5; //2 cycles
 
 #elif F_CPU >= 8000000L
@@ -208,9 +208,9 @@ void delayMicroseconds(unsigned int us)
 	// delay requested.
 	us <<= 1; //x2 us, = 2 cycles
 
-	// account for the time taken in the preceeding commands.
+	// account for the time taken in the preceding commands.
 	// we just burned 17 (19) cycles above, remove 4, (4*4=16)
-	// us is at least 6 so we can substract 4
+	// us is at least 6 so we can subtract 4
 	us -= 4; // = 2 cycles
 
 #else
@@ -218,9 +218,9 @@ void delayMicroseconds(unsigned int us)
 
 	// the overhead of the function calls is 14 (16) cycles
 	if (us <= 16) return; //= 3 cycles, (4 when true)
-	if (us <= 25) return; //= 3 cycles, (4 when true), (must be at least 25 if we want to substract 22)
+	if (us <= 25) return; //= 3 cycles, (4 when true), (must be at least 25 if we want to subtract 22)
 
-	// compensate for the time taken by the preceeding and next commands (about 22 cycles)
+	// compensate for the time taken by the preceding and next commands (about 22 cycles)
 	us -= 22; // = 2 cycles
 	// the following loop takes 4 microseconds (4 cycles)
 	// per iteration, so execute it us/4 times
diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c
index 27a62fc..432a150 100644
--- a/cores/arduino/wiring_digital.c
+++ b/cores/arduino/wiring_digital.c
@@ -67,7 +67,7 @@ void pinMode(uint8_t pin, uint8_t mode)
 //
 // Mark Sproul:
 // - Removed inline. Save 170 bytes on atmega1280
-// - changed to a switch statment; added 32 bytes but much easier to read and maintain.
+// - changed to a switch statement; added 32 bytes but much easier to read and maintain.
 // - Added more #ifdefs, now compiles for atmega645
 //
 //static inline void turnOffPWM(uint8_t timer) __attribute__ ((always_inline));
diff --git a/libraries/EEPROM/README.md b/libraries/EEPROM/README.md
index a624136..9ca761d 100644
--- a/libraries/EEPROM/README.md
+++ b/libraries/EEPROM/README.md
@@ -53,7 +53,7 @@ This function does not return any value.
 This function will retrieve any object from the EEPROM.
 Two parameters are needed to call this function. The first is an `int` containing the address that is to be written, and the second is the object you would like to read.
 
-This function returns a reference to the `object` passed in. It does not need to be used and is only returned for conveience.
+This function returns a reference to the `object` passed in. It does not need to be used and is only returned for convenience.
 
 #### **`EEPROM.put( address, object )`** [[_example_]](examples/eeprom_put/eeprom_put.ino)
 
@@ -62,7 +62,7 @@ Two parameters are needed to call this function. The first is an `int` containin
 
 This function uses the _update_ method to write its data, and therefore only rewrites changed cells.
 
-This function returns a reference to the `object` passed in. It does not need to be used and is only returned for conveience.
+This function returns a reference to the `object` passed in. It does not need to be used and is only returned for convenience.
 
 #### **Subscript operator: `EEPROM[address]`** [[_example_]](examples/eeprom_crc/eeprom_crc.ino)
 
@@ -136,4 +136,4 @@ This is useful for STL objects, custom iteration and C++11 style ranged for loop
 This function returns an `EEPtr` pointing at the location after the last EEPROM cell.  
 Used with `begin()` to provide custom iteration.
 
-**Note:** The `EEPtr` returned is invalid as it is out of range. Infact the hardware causes wrapping of the address (overflow) and `EEPROM.end()` actually references the first EEPROM cell.
+**Note:** The `EEPtr` returned is invalid as it is out of range. In fact the hardware causes wrapping of the address (overflow) and `EEPROM.end()` actually references the first EEPROM cell.
diff --git a/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino b/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino
index 8b5121c..3fed10f 100644
--- a/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino
+++ b/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino
@@ -18,9 +18,9 @@ void setup() {
     Iterate through each byte of the EEPROM storage.
 
     Larger AVR processors have larger EEPROM sizes, E.g:
-    - Arduno Duemilanove: 512b EEPROM storage.
-    - Arduino Uno:        1kb EEPROM storage.
-    - Arduino Mega:       4kb EEPROM storage.
+    - Arduino Duemilanove: 512 B EEPROM storage.
+    - Arduino Uno:         1 kB EEPROM storage.
+    - Arduino Mega:        4 kB EEPROM storage.
 
     Rather than hard-coding the length, you should use the pre-provided length function.
     This will make your code portable to all AVR processors.
diff --git a/libraries/EEPROM/examples/eeprom_iteration/eeprom_iteration.ino b/libraries/EEPROM/examples/eeprom_iteration/eeprom_iteration.ino
index 3673b47..b5d68be 100644
--- a/libraries/EEPROM/examples/eeprom_iteration/eeprom_iteration.ino
+++ b/libraries/EEPROM/examples/eeprom_iteration/eeprom_iteration.ino
@@ -54,4 +54,4 @@ void setup() {
 
 } //End of setup function.
 
-void loop() {}
\ No newline at end of file
+void loop() {}
diff --git a/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino b/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino
index a8a3510..d465035 100644
--- a/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino
+++ b/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino
@@ -33,9 +33,9 @@ void loop() {
     Advance to the next address, when at the end restart at the beginning.
 
     Larger AVR processors have larger EEPROM sizes, E.g:
-    - Arduno Duemilanove: 512b EEPROM storage.
-    - Arduino Uno:        1kb EEPROM storage.
-    - Arduino Mega:       4kb EEPROM storage.
+    - Arduino Duemilanove: 512 B EEPROM storage.
+    - Arduino Uno:         1 kB EEPROM storage.
+    - Arduino Mega:        4 kB EEPROM storage.
 
     Rather than hard-coding the length, you should use the pre-provided length function.
     This will make your code portable to all AVR processors.
diff --git a/libraries/EEPROM/examples/eeprom_update/eeprom_update.ino b/libraries/EEPROM/examples/eeprom_update/eeprom_update.ino
index 5e3db5b..f5b0c0c 100644
--- a/libraries/EEPROM/examples/eeprom_update/eeprom_update.ino
+++ b/libraries/EEPROM/examples/eeprom_update/eeprom_update.ino
@@ -17,7 +17,7 @@
 int address = 0;
 
 void setup() {
-  /** EMpty setup **/
+  /** Empty setup **/
 }
 
 void loop() {
@@ -48,9 +48,9 @@ void loop() {
     Advance to the next address, when at the end restart at the beginning.
 
     Larger AVR processors have larger EEPROM sizes, E.g:
-    - Arduno Duemilanove: 512b EEPROM storage.
-    - Arduino Uno:        1kb EEPROM storage.
-    - Arduino Mega:       4kb EEPROM storage.
+    - Arduino Duemilanove: 512 B EEPROM storage.
+    - Arduino Uno:         1 kB EEPROM storage.
+    - Arduino Mega:        4 kB EEPROM storage.
 
     Rather than hard-coding the length, you should use the pre-provided length function.
     This will make your code portable to all AVR processors.
diff --git a/libraries/EEPROM/examples/eeprom_write/eeprom_write.ino b/libraries/EEPROM/examples/eeprom_write/eeprom_write.ino
index f9bea64..64e835c 100644
--- a/libraries/EEPROM/examples/eeprom_write/eeprom_write.ino
+++ b/libraries/EEPROM/examples/eeprom_write/eeprom_write.ino
@@ -36,9 +36,9 @@ void loop() {
     Advance to the next address, when at the end restart at the beginning.
 
     Larger AVR processors have larger EEPROM sizes, E.g:
-    - Arduno Duemilanove: 512b EEPROM storage.
-    - Arduino Uno:        1kb EEPROM storage.
-    - Arduino Mega:       4kb EEPROM storage.
+    - Arduino Duemilanove: 512 B EEPROM storage.
+    - Arduino Uno:         1 kB EEPROM storage.
+    - Arduino Mega:        4 kB EEPROM storage.
 
     Rather than hard-coding the length, you should use the pre-provided length function.
     This will make your code portable to all AVR processors.
diff --git a/libraries/HID/src/HID.cpp b/libraries/HID/src/HID.cpp
index 21ede26..3dd85fc 100644
--- a/libraries/HID/src/HID.cpp
+++ b/libraries/HID/src/HID.cpp
@@ -43,7 +43,7 @@ int HID_::getDescriptor(USBSetup& setup)
 	if (setup.bmRequestType != REQUEST_DEVICETOHOST_STANDARD_INTERFACE) { return 0; }
 	if (setup.wValueH != HID_REPORT_DESCRIPTOR_TYPE) { return 0; }
 
-	// In a HID Class Descriptor wIndex cointains the interface number
+	// In a HID Class Descriptor wIndex contains the interface number
 	if (setup.wIndex != pluggedInterface) { return 0; }
 
 	int total = 0;
diff --git a/libraries/SPI/examples/BarometricPressureSensor/BarometricPressureSensor.ino b/libraries/SPI/examples/BarometricPressureSensor/BarometricPressureSensor.ino
index df73ade..1b8ad70 100644
--- a/libraries/SPI/examples/BarometricPressureSensor/BarometricPressureSensor.ino
+++ b/libraries/SPI/examples/BarometricPressureSensor/BarometricPressureSensor.ino
@@ -43,7 +43,7 @@ void setup() {
   // start the SPI library:
   SPI.begin();
 
-  // initalize the  data ready and chip select pins:
+  // initialize the  data ready and chip select pins:
   pinMode(dataReadyPin, INPUT);
   pinMode(chipSelectPin, OUTPUT);
 
@@ -140,4 +140,3 @@ void writeRegister(byte thisRegister, byte thisValue) {
   // take the chip select high to de-select:
   digitalWrite(chipSelectPin, HIGH);
 }
-
diff --git a/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino b/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino
index 8719058..39e5bf9 100644
--- a/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino
+++ b/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino
@@ -14,7 +14,7 @@
  The circuit:
   * All A pins  of AD5206 connected to +5V
   * All B pins of AD5206 connected to ground
-  * An LED and a 220-ohm resisor in series connected from each W pin to ground
+  * An LED and a 220-ohm resistor in series connected from each W pin to ground
   * CS - to digital pin 10  (SS pin)
   * SDI - to digital pin 11 (MOSI pin)
   * CLK - to digital pin 13 (SCK pin)
@@ -27,7 +27,7 @@
 */
 
 
-// inslude the SPI library:
+// include the SPI library:
 #include <SPI.h>
 
 
@@ -64,7 +64,7 @@ void digitalPotWrite(int address, int value) {
   // take the SS pin low to select the chip:
   digitalWrite(slaveSelectPin, LOW);
   delay(100);
-  //  send in the address and value via SPI:
+  // send in the address and value via SPI:
   SPI.transfer(address);
   SPI.transfer(value);
   delay(100);
diff --git a/libraries/SPI/src/SPI.h b/libraries/SPI/src/SPI.h
index 5206a09..1e37079 100644
--- a/libraries/SPI/src/SPI.h
+++ b/libraries/SPI/src/SPI.h
@@ -106,7 +106,7 @@ private:
     // slowest (128 == 2 ^^ 7, so clock_div = 6).
     uint8_t clockDiv;
 
-    // When the clock is known at compiletime, use this if-then-else
+    // When the clock is known at compile time, use this if-then-else
     // cascade, which the compiler knows how to completely optimize
     // away. When clock is not known, use a loop instead, which generates
     // shorter code.
diff --git a/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino b/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
index 61ce88c..061bb70 100644
--- a/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
+++ b/libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino
@@ -1,5 +1,5 @@
 /*
-  Software serial multple serial test
+  Software serial multiple serial test
 
  Receives from the hardware serial, sends to software serial.
  Receives from software serial, sends to hardware serial.
@@ -52,4 +52,3 @@ void loop() { // run over and over
     mySerial.write(Serial.read());
   }
 }
-
diff --git a/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino b/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
index 8d7f93e..d8c064b 100644
--- a/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
+++ b/libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino
@@ -1,5 +1,5 @@
 /*
-  Software serial multple serial test
+  Software serial multiple serial test
 
  Receives from the two software serial ports,
  sends to the hardware serial port.
@@ -56,7 +56,7 @@ void setup() {
 }
 
 void loop() {
-  // By default, the last intialized port is listening.
+  // By default, the last initialized port is listening.
   // when you want to listen on a port, explicitly select it:
   portOne.listen();
   Serial.println("Data from port one:");
@@ -83,9 +83,3 @@ void loop() {
   // blank line to separate data from the two ports:
   Serial.println();
 }
-
-
-
-
-
-
diff --git a/libraries/Wire/examples/SFRRanger_reader/SFRRanger_reader.ino b/libraries/Wire/examples/SFRRanger_reader/SFRRanger_reader.ino
index 4d0a68f..aeb1a9c 100644
--- a/libraries/Wire/examples/SFRRanger_reader/SFRRanger_reader.ino
+++ b/libraries/Wire/examples/SFRRanger_reader/SFRRanger_reader.ino
@@ -3,7 +3,7 @@
 // and James Tichenor <http://www.jamestichenor.net>
 
 // Demonstrates use of the Wire library reading data from the
-// Devantech Utrasonic Rangers SFR08 and SFR10
+// Devantech Ultrasonic Rangers SFR08 and SFR10
 
 // Created 29 April 2006
 
@@ -13,8 +13,8 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin();                // join i2c bus (address optional for master)
-  Serial.begin(9600);          // start serial communication at 9600bps
+  Wire.begin();                // join I2C bus (address optional for master)
+  Serial.begin(9600);          // start serial communication at 9600 bps
 }
 
 int reading = 0;
@@ -23,7 +23,7 @@ void loop() {
   // step 1: instruct sensor to read echoes
   Wire.beginTransmission(112); // transmit to device #112 (0x70)
   // the address specified in the datasheet is 224 (0xE0)
-  // but i2c adressing uses the high 7 bits so it's 112
+  // but I2C addressing uses the high 7 bits so it's 112
   Wire.write(byte(0x00));      // sets register pointer to the command register (0x00)
   Wire.write(byte(0x50));      // command sensor to measure in "inches" (0x50)
   // use 0x51 for centimeters
diff --git a/libraries/Wire/examples/digital_potentiometer/digital_potentiometer.ino b/libraries/Wire/examples/digital_potentiometer/digital_potentiometer.ino
index dd40a25..b5da366 100644
--- a/libraries/Wire/examples/digital_potentiometer/digital_potentiometer.ino
+++ b/libraries/Wire/examples/digital_potentiometer/digital_potentiometer.ino
@@ -13,7 +13,7 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin(); // join i2c bus (address optional for master)
+  Wire.begin(); // join I2C bus (address optional for master)
 }
 
 byte val = 0;
@@ -31,4 +31,3 @@ void loop() {
   }
   delay(500);
 }
-
diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
index 3febbf4..295edf7 100644
--- a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
+++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
@@ -5,7 +5,7 @@
 //    This program (or code that looks like it)
 //    can be found in many places.
 //    For example on the Arduino.cc forum.
-//    The original author is not know.
+//    The original author is not known.
 // Version 2, Juni 2012, Using Arduino 1.0.1
 //     Adapted to be as simple as possible by Arduino.cc user Krodal
 // Version 3, Feb 26  2013
@@ -33,7 +33,7 @@ void setup() {
   Wire.begin();
 
   Serial.begin(9600);
-  while (!Serial); // Leonardo: wait for serial monitor
+  while (!Serial); // Leonardo: wait for Serial Monitor
   Serial.println("\nI2C Scanner");
 }
 
@@ -44,7 +44,7 @@ void loop() {
 
   for (byte address = 1; address < 127; ++address) {
     // The i2c_scanner uses the return value of
-    // the Write.endTransmisstion to see if
+    // the Wire.endTransmission to see if
     // a device did acknowledge to the address.
     Wire.beginTransmission(address);
     byte error = Wire.endTransmission();
diff --git a/libraries/Wire/examples/master_reader/master_reader.ino b/libraries/Wire/examples/master_reader/master_reader.ino
index ecab72a..e27cac3 100644
--- a/libraries/Wire/examples/master_reader/master_reader.ino
+++ b/libraries/Wire/examples/master_reader/master_reader.ino
@@ -13,7 +13,7 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin();        // join i2c bus (address optional for master)
+  Wire.begin();        // join I2C bus (address optional for master)
   Serial.begin(9600);  // start serial for output
 }
 
diff --git a/libraries/Wire/examples/master_writer/master_writer.ino b/libraries/Wire/examples/master_writer/master_writer.ino
index 5cbea11..7a17668 100644
--- a/libraries/Wire/examples/master_writer/master_writer.ino
+++ b/libraries/Wire/examples/master_writer/master_writer.ino
@@ -13,7 +13,7 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin(); // join i2c bus (address optional for master)
+  Wire.begin(); // join I2C bus (address optional for master)
 }
 
 byte x = 0;
diff --git a/libraries/Wire/examples/slave_receiver/slave_receiver.ino b/libraries/Wire/examples/slave_receiver/slave_receiver.ino
index 8051d53..9b3f814 100644
--- a/libraries/Wire/examples/slave_receiver/slave_receiver.ino
+++ b/libraries/Wire/examples/slave_receiver/slave_receiver.ino
@@ -13,7 +13,7 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin(8);                // join i2c bus with address #8
+  Wire.begin(8);                // join I2C bus with address #8
   Wire.onReceive(receiveEvent); // register event
   Serial.begin(9600);           // start serial for output
 }
diff --git a/libraries/Wire/examples/slave_sender/slave_sender.ino b/libraries/Wire/examples/slave_sender/slave_sender.ino
index d2e72bb..6e2ed49 100644
--- a/libraries/Wire/examples/slave_sender/slave_sender.ino
+++ b/libraries/Wire/examples/slave_sender/slave_sender.ino
@@ -13,7 +13,7 @@
 #include <Wire.h>
 
 void setup() {
-  Wire.begin(8);                // join i2c bus with address #8
+  Wire.begin(8);                // join I2C bus with address #8
   Wire.onRequest(requestEvent); // register event
 }
 
diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
index c407776..001d924 100644
--- a/libraries/Wire/src/Wire.cpp
+++ b/libraries/Wire/src/Wire.cpp
@@ -100,7 +100,7 @@ void TwoWire::setClock(uint32_t clock)
  * when `clearWireTimeoutFlag()` or `setWireTimeoutUs()` is called.
  *
  * Note that this timeout can also trigger while waiting for clock stretching or waiting for a second master
- * to complete its transaction. So make sure to adapt the timeout to accomodate for those cases if needed.
+ * to complete its transaction. So make sure to adapt the timeout to accommodate for those cases if needed.
  * A typical timeout would be 25ms (which is the maximum clock stretching allowed by the SMBus protocol),
  * but (much) shorter values will usually also work.
  *
@@ -120,7 +120,7 @@ void TwoWire::setWireTimeout(uint32_t timeout, bool reset_with_timeout){
 /***
  * Returns the TWI timeout flag.
  *
- * @return true if timeout has occured since the flag was last cleared.
+ * @return true if timeout has occurred since the flag was last cleared.
  */
 bool TwoWire::getWireTimeoutFlag(void){
   return(twi_manageTimeoutFlag(false));
diff --git a/libraries/Wire/src/utility/twi.c b/libraries/Wire/src/utility/twi.c
index d223760..e09a33c 100644
--- a/libraries/Wire/src/utility/twi.c
+++ b/libraries/Wire/src/utility/twi.c
@@ -175,7 +175,7 @@ uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sen
   }
   twi_state = TWI_MRX;
   twi_sendStop = sendStop;
-  // reset error state (0xFF.. no error occured)
+  // reset error state (0xFF.. no error occurred)
   twi_error = 0xFF;
 
   // initialize buffer iteration vars
@@ -183,7 +183,7 @@ uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sen
   twi_masterBufferLength = length-1;  // This is not intuitive, read on...
   // On receive, the previously configured ACK/NACK setting is transmitted in
   // response to the received byte before the interrupt is signalled. 
-  // Therefor we must actually set NACK when the _next_ to last byte is
+  // Therefore we must actually set NACK when the _next_ to last byte is
   // received, causing that NACK to be sent in response to receiving the last
   // expected byte of data.
 
@@ -269,7 +269,7 @@ uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait
   }
   twi_state = TWI_MTX;
   twi_sendStop = sendStop;
-  // reset error state (0xFF.. no error occured)
+  // reset error state (0xFF.. no error occurred)
   twi_error = 0xFF;
 
   // initialize buffer iteration vars
@@ -294,7 +294,7 @@ uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait
     // We need to remove ourselves from the repeated start state before we enable interrupts,
     // since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning
     // up. Also, don't enable the START interrupt. There may be one pending from the 
-    // repeated start that we sent outselves, and that would really confuse things.
+    // repeated start that we sent ourselves, and that would really confuse things.
     twi_inRepStart = false;			// remember, we're dealing with an ASYNC ISR
     startMicros = micros();
     do {
@@ -411,7 +411,7 @@ void twi_stop(void)
   // send stop condition
   TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTO);
 
-  // wait for stop condition to be exectued on bus
+  // wait for stop condition to be executed on bus
   // TWINT is not set after a stop condition!
   // We cannot use micros() from an ISR, so approximate the timeout with cycle-counted delays
   const uint8_t us_per_loop = 8;
diff --git a/programmers.txt b/programmers.txt
index 69ddf69..33ace57 100644
--- a/programmers.txt
+++ b/programmers.txt
@@ -81,7 +81,7 @@ buspirate.program.extra_params=-P{serial.port}
 # STK500 firmware version v1 and v2 use different serial protocols.
 # Using the 'stk500' protocol tells avrdude to try and autodetect the
 # firmware version. If this leads to problems, we might need to add
-# stk500v1 and stk500v2 entries to allow explicitely selecting the
+# stk500v1 and stk500v2 entries to allow explicitly selecting the
 # firmware version.
 stk500.name=Atmel STK500 development board
 stk500.communication=serial