Update to reflex new arduino-pico core v1.4.0

Author: khoih-prog

README.md

@@ -24,7 +24,9 @@
   * [Manual Install](#manual-install)
   * [VS Code & PlatformIO](#vs-code--platformio)
 * [Packages' Patches](#packages-patches)
-  * [1. For RP2040-based boards](#1-for-rp2040-based-boards)
+  * [1. For RP2040-based boards using Earle Philhower arduino-pico core](#1-for-rp2040-based-boards-using-earle-philhower-arduino-pico-core)
+    * [1.1. To use BOARD_NAME](#11-to-use-board_name)
+    * [1.2. To avoid compile error relating to microsecondsToClockCycles](#12-to-avoid-compile-error-relating-to-microsecondstoclockcycles)
 * [HOWTO Fix `Multiple Definitions` Linker Error](#howto-fix-multiple-definitions-linker-error)
 * [More useful Information](#more-useful-information)
 * [Usage](#usage)
@@ -135,7 +137,7 @@ The catch is **your function is now part of an ISR (Interrupt Service Routine),
 ## Prerequisites
 
 1. [`Arduino IDE 1.8.13+` for Arduino](https://www.arduino.cc/en/Main/Software)
-2. [`Earle Philhower's arduino-pico core v1.2.1+`](https://github.com/earlephilhower/arduino-pico) for RP2040-based boards such as **RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040 and GENERIC_RP2040**, etc. [![GitHub release](https://img.shields.io/github/release/earlephilhower/arduino-pico.svg)](https://github.com/earlephilhower/arduino-pico/releases/latest) 
+2. [`Earle Philhower's arduino-pico core v1.4.0+`](https://github.com/earlephilhower/arduino-pico) for RP2040-based boards such as **RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040 and GENERIC_RP2040**, etc. [![GitHub release](https://img.shields.io/github/release/earlephilhower/arduino-pico.svg)](https://github.com/earlephilhower/arduino-pico/releases/latest)
 
 ---
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@@ -169,19 +171,38 @@ Another way to install is to:
 
 ### Packages' Patches
 
-#### 1. For RP2040-based boards
- 
- ***To be able to automatically detect and display BOARD_NAME on RP2040-based boards (RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040, GENERIC_RP2040, etc) boards***, you have to copy the file [RP2040 platform.txt](Packages_Patches/rp2040/hardware/rp2040/1.2.1) into rp2040 directory (~/.arduino15/packages/rp2040/hardware/rp2040/1.2.1). 
+#### 1. For RP2040-based boards using [Earle Philhower arduino-pico core](https://github.com/earlephilhower/arduino-pico)
 
-Supposing the rp2040 core version is 1.2.1. This file must be copied into the directory:
+#### 1.1 To use BOARD_NAME
 
-- `~/.arduino15/packages/rp2040/hardware/rp2040/1.2.1/platform.txt`
+ **To be able to automatically detect and display BOARD_NAME on RP2040-based boards (RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040, GENERIC_RP2040, etc) boards**, you have to copy the file [RP2040 platform.txt](Packages_Patches/rp2040/hardware/rp2040/1.4.0) into rp2040 directory (~/.arduino15/packages/rp2040/hardware/rp2040/1.4.0). 
+
+Supposing the rp2040 core version is 1.4.0. This file must be copied into the directory:
+
+- `~/.arduino15/packages/rp2040/hardware/rp2040/1.4.0/platform.txt`
 
 Whenever a new version is installed, remember to copy this file into the new version directory. For example, new version is x.yy.zz
 This file must be copied into the directory:
 
 - `~/.arduino15/packages/rp2040/hardware/rp2040/x.yy.zz/platform.txt`
 
+With core after v1.4.0, this step is not necessary anymore thanks to the PR [Add -DBOARD_NAME="{build.board}" #136](https://github.com/earlephilhower/arduino-pico/pull/136).
+
+#### 1.2 To avoid compile error relating to microsecondsToClockCycles
+
+Some libraries, such as [Adafruit DHT-sensor-library](https://github.com/adafruit/DHT-sensor-library), require the definition of microsecondsToClockCycles(). **To be able to compile and run on RP2040-based boards**, you have to copy the files in [**RP2040 Arduino.h**](Packages_Patches/rp2040/hardware/rp2040/1.4.0/cores/rp2040/Arduino.h) into rp2040 directory (~/.arduino15/packages/rp2040/hardware/rp2040/1.4.0).
+
+Supposing the rp2040 core version is 1.4.0. This file must be copied to replace:
+
+- `~/.arduino15/packages/rp2040/hardware/rp2040/1.4.0/cores/rp2040/Arduino.h`
+
+Whenever a new version is installed, remember to copy this file into the new version directory. For example, new version is x.yy.zz
+This file must be copied to replace:
+
+- `~/.arduino15/packages/rp2040/hardware/rp2040/x.yy.zz/cores/rp2040/Arduino.h`
+
+With core after v1.4.0, this step is not necessary anymore thanks to the PR [Add defs for compatibility #142](https://github.com/earlephilhower/arduino-pico/pull/142).
+
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