Documentation

README.md

@@ -508,6 +508,10 @@ void loop() {}
 The FAST protocol can be received by IRremote and TinyIRReceiver.
 
 # FAQ and hints
+## Receiving does not run if analogWrite() or tone() is used.
+The receiver sample interval of 50 µs is generated by a timer. On many boards this must be a [hardware timer](https://github.com/Arduino-IRremote/Arduino-IRremote?tab=readme-ov-file#timer-and-pin-usage). On some boards where a software timer is available, the software timer is used.<br/>
+Be aware that the hardware timer used for receiving should not be used for analogWrite().<br/>
+On the Uno and other AVR boards the receiver timer ist the same as the tone timer, so receiving will stop after a tone() command. See [ReceiveDemo example](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/b962db8f4e47408df01474a57f313f5a6bbe39a1/examples/ReceiveDemo/ReceiveDemo.ino#L257) how to deal with it.
 
 ## Problems with Neopixels, FastLed etc.
 IRremote will not work right when you use **Neopixels** (aka WS2811/WS2812/WS2812B) or other libraries blocking interrupts for a longer time (> 50 &micro;s).<br/>
@@ -695,7 +699,7 @@ Here you see the delay of the receiver output (blue) from the IR diode input (ye
 # Issues and discussions
 - Do not open an issue without first testing some of the examples!
 - If you have a problem, please post the MCVE (Minimal Complete Verifiable Example) showing this problem. My experience is, that most of the times you will find the problem while creating this MCVE :smile:.
-- [Use code blocks](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#code); **it helps us help you when we can read your code!**
+- [Use code blocks](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#code); **it helps us to help you when we can read your code!**
 
 <br/>
 
@@ -963,4 +967,4 @@ From the version 2.8.0, the license is the MIT license.
 # Copyright
 Initially coded 2009 Ken Shirriff http://www.righto.com<br/>
 Copyright (c) 2016-2017 Rafi Khan<br/>
-Copyright (c) 2020-2023 [Armin Joachimsmeyer](https://github.com/ArminJo)
+Copyright (c) 2020-2024 [Armin Joachimsmeyer](https://github.com/ArminJo)

examples/AllProtocolsOnLCD/LiquidCrystal_I2C.cpp

@@ -1,4 +1,12 @@
 // Based on the work by DFRobot
+/*
+ * Extensions made by AJ 2023
+ * Removed Arduino 0.x support
+ * Added SoftI2CMaste support, which drastically reduces program size.
+ * Added OLED stuff
+ * Added createChar() with PROGMEM input
+ * Added fast timing
+ */
 
 #include "Arduino.h"
 
@@ -23,6 +31,18 @@ inline size_t LiquidCrystal_I2C::write(uint8_t value) {
 #include "SoftWire.h"
 #endif
 
+#if defined(__AVR__)
+/*
+ * The datasheet says: a command need > 37us to settle. Enable pulse must be > 450ns.
+ * Use no delay for enable pulse after each command,
+ * because the overhead of this library seems to be using the 37 us and 450 ns.
+ * At least it works perfectly for all my LCD's connected to Uno, Nano etc.
+ * and it saves a lot of time in realtime applications using LCD as display,
+ * like https://github.com/ArminJo/Arduino-DTSU666H_PowerMeter
+ */
+#define USE_FAST_TIMING
+#endif
+
 // When the display powers up, it is configured as follows:
 //
 // 1. Display clear
@@ -131,7 +151,11 @@ void LiquidCrystal_I2C::begin(uint8_t cols __attribute__((unused)), uint8_t line
 /********** high level commands, for the user! */
 void LiquidCrystal_I2C::clear() {
     command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
+#if defined(USE_FAST_TIMING)
     delayMicroseconds(1500);  // this command takes a long time! // AJ 20.9.23 1200 is too short for my 2004 LCD's, 1400 is OK
+#else
+    delayMicroseconds(2000);  // this command takes a long time!
+#endif
     if (_oled)
         setCursor(0, 0);
 }
@@ -274,10 +298,13 @@ void LiquidCrystal_I2C::expanderWrite(uint8_t _data) {
 
 void LiquidCrystal_I2C::pulseEnable(uint8_t _data) {
     expanderWrite(_data | En);	// En high
-//    delayMicroseconds(1);		// enable pulse must be >450ns // AJ 20.9.23 not required for my LCD's
-
+#if !defined(USE_FAST_TIMING)
+    delayMicroseconds(1);		// enable pulse must be > 450ns // AJ 20.9.23 not required for my LCD's
+#endif
     expanderWrite(_data & ~En);	// En low
-//    delayMicroseconds(50);      // commands need > 37us to settle // AJ 20.9.23 not required for my LCD's
+#if !defined(USE_FAST_TIMING)
+    delayMicroseconds(50);      // commands need > 37us to settle // AJ 20.9.23 not required for my LCD's
+#endif
 }
 
 // Alias functions

src/IRReceive.hpp

@@ -772,7 +772,7 @@ bool IRrecv::decodePulseDistanceWidthData(uint_fast8_t aNumberOfBits, IRRawlenTy
             } else {
                 tDecodedData |= tMask;
             }
-            IR_TRACE_PRINTLN('1');
+            IR_TRACE_PRINTLN(F("=> 1"));
         } else {
 #if defined DECODE_STRICT_CHECKS
             /*
@@ -811,7 +811,7 @@ bool IRrecv::decodePulseDistanceWidthData(uint_fast8_t aNumberOfBits, IRRawlenTy
             }
 #endif
             // do not set the bit
-            IR_TRACE_PRINTLN('0');
+            IR_TRACE_PRINTLN(F("=> 0"));
         }
 #if defined DECODE_STRICT_CHECKS
         // If we have no stop bit, assume that last space, which is not recorded, is correct, since we can not check it

src/ir_Lego.hpp

@@ -45,6 +45,7 @@
 // from LEGO Power Functions RC Manual 26.02.2010 Version 1.20
 // https://github.com/jurriaan/Arduino-PowerFunctions/raw/master/LEGO_Power_Functions_RC_v120.pdf
 // https://oberguru.net/elektronik/ir/codes/lego_power_functions_train.lircd.conf
+// For original LEGO receiver see: https://www.philohome.com/pfrec/pfrec.htm and https://www.youtube.com/watch?v=KCM4Ug1bPrM
 //
 // To ensure correct detection of IR messages six 38 kHz cycles are transmitted as mark.
 // Low bit consists of 6 cycles of IR and 10 <20>cycles<65> of pause,