Spelling fixes (#271)

Author: scop

.github/CONTRIBUTING.md

@@ -53,7 +53,7 @@ Provide more context by answering these questions:
 
 * **Can you reproduce the problem in one of the code examples?**
 * **Did the problem start happening recently** (e.g. after updating to a new version of Arduino or the library) or was this always a problem?
-* If the problem started happening recently, **can you reproduce the problem in an older version of the libary?** What's the most recent version in which the problem doesn't happen? You can download older versions of the library from [the releases page](https://github.com/markszabo/IRremoteESP8266/releases).
+* If the problem started happening recently, **can you reproduce the problem in an older version of the library?** What's the most recent version in which the problem doesn't happen? You can download older versions of the library from [the releases page](https://github.com/markszabo/IRremoteESP8266/releases).
 * **Can you reliably reproduce the issue?** If not, provide details about how often the problem happens and under which conditions it normally happens.
 
 Include details about your configuration, circuit and environment:

src/IRrecv.cpp

@@ -234,7 +234,7 @@ bool IRrecv::decode(decode_results *results, irparams_t *save) {
     return true;
 #endif
 #if DECODE_DENON
-  // Denon needs to preceed Panasonic as it is a special case of Panasonic.
+  // Denon needs to precede Panasonic as it is a special case of Panasonic.
 #ifdef DEBUG
   DPRINTLN("Attempting Denon decode");
 #endif

src/IRsend.cpp

@@ -180,7 +180,7 @@ void IRsend::calibrate(uint16_t hz) {
   IRtimer usecTimer = IRtimer();  // Start a timer *just* before we do the call.
   uint16_t pulses = mark(UINT16_MAX);  // Generate a PWM of 65,535 us. (Max.)
   uint32_t timeTaken = usecTimer.elapsed();  // Record the time it took.
-  // While it shouldn't be neccesary, assume at least 1 pulse, to avoid a
+  // While it shouldn't be necessary, assume at least 1 pulse, to avoid a
   // divide by 0 situation.
   pulses = std::max(pulses, (uint16_t) 1U);
   uint32_t calcPeriod = calcUSecPeriod(hz);  // e.g. @38kHz it should be 26us.

src/ir_Dish.cpp

@@ -11,7 +11,7 @@
 //                        D  D    I        S  H   H
 //                       DDDD   IIIII  SSSS   H   H
 
-// DISH support orginally by Todd Treece
+// DISH support originally by Todd Treece
 //   http://unionbridge.org/design/ircommand
 
 // Constants

src/ir_Pronto.cpp

@@ -29,7 +29,7 @@
 // Status: ALPHA / Not tested in the real world.
 //
 // Note:
-//   Pronto codes are typically represented in hexidecimal.
+//   Pronto codes are typically represented in hexadecimal.
 //   You will need to convert the code to an array of integers, and calculate
 //   it's length.
 //   e.g.

src/ir_Sanyo.cpp

@@ -99,7 +99,7 @@ uint64_t IRsend::encodeSanyoLC7461(uint16_t address, uint8_t command) {
 //   https://github.com/marcosamarinho/IRremoteESP8266/blob/master/ir_Sanyo.cpp
 //   http://pdf.datasheetcatalog.com/datasheet/sanyo/LC7461.pdf
 void IRsend::sendSanyoLC7461(uint64_t data, uint16_t nbits, uint16_t repeat) {
-  // This protocol appears to be another 42-bit varient of the NEC protcol.
+  // This protocol appears to be another 42-bit variant of the NEC protcol.
   sendNEC(data, nbits, repeat);
 }
 #endif  // SEND_SANYO
@@ -130,7 +130,7 @@ bool IRrecv::decodeSanyoLC7461(decode_results *results, uint16_t nbits,
                                bool strict) {
   if (strict && nbits != SANYO_LC7461_BITS)
     return false;  // Not strictly in spec.
-  // This protocol is basically a 42-bit varient of the NEC protocol.
+  // This protocol is basically a 42-bit variant of the NEC protocol.
   if (!decodeNEC(results, nbits, false))
     return false;  // Didn't match a NEC format (without strict)
 

test/ir_RCMM_test.cpp

@@ -153,7 +153,7 @@ TEST(TestDecodeRCMM, DecodeWithoutStrict) {
   EXPECT_EQ(0x0, irsend.capture.address);
   EXPECT_EQ(0x0, irsend.capture.command);
 
-  // Illiegal RCMM 36-bit message.
+  // Illegal RCMM 36-bit message.
   irsend.reset();
   irsend.sendRCMM(0x123456789, 36);
   irsend.makeDecodeResult();