From 587f5e7fc914a5631c872fb850952e75a84a3b50 Mon Sep 17 00:00:00 2001
From: Nacho <nacabaro@nacatech.es>
Date: Tue, 2 Dec 2025 00:46:15 +0100
Subject: [PATCH] Initial commit

---
 include/README | 37 +++++++++++++++++++++++++++++++++++++
 lib/README     | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/main.cpp   | 25 +++++++++++++++++++++++++
 test/README    | 11 +++++++++++
 4 files changed, 119 insertions(+)
 create mode 100644 include/README
 create mode 100644 lib/README
 create mode 100644 src/main.cpp
 create mode 100644 test/README

diff --git a/include/README b/include/README
new file mode 100644
index 0000000..49819c0
--- /dev/null
+++ b/include/README
@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/lib/README b/lib/README
new file mode 100644
index 0000000..9379397
--- /dev/null
+++ b/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..469762b
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,25 @@
+#include <Arduino.h>
+
+#define EXTERNAL_RX_PIN 16 // GPIO pin for the external device's TX
+#define EXTERNAL_TX_PIN 17 // GPIO pin for the external device's RX
+#define BAUD_RATE 115200
+
+void setup() {
+  // Initialize communication with the computer (via USB-to-UART chip)
+  Serial.begin(BAUD_RATE); 
+  
+  // Initialize communication with the external device (on designated GPIO pins)
+  Serial2.begin(BAUD_RATE, SERIAL_8N1, EXTERNAL_RX_PIN, EXTERNAL_TX_PIN);
+}
+
+void loop() {
+  // Read from computer (Serial) and send to external device (Serial2)
+  if (Serial.available()) {
+    Serial2.write(Serial.read());
+  }
+
+  // Read from external device (Serial2) and send to computer (Serial)
+  if (Serial2.available()) {
+    Serial.write(Serial2.read());
+  }
+}
\ No newline at end of file
diff --git a/test/README b/test/README
new file mode 100644
index 0000000..9b1e87b
--- /dev/null
+++ b/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html