From 3120783000d0025b183b0397acaa8b769499eb38 Mon Sep 17 00:00:00 2001
From: krolyxon <me@krolyxon.com>
Date: Mon, 8 Jun 2026 23:10:46 +0530
Subject: Initial gh-pages firmware hosting

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+# ATXMEGA
+
+@tableofcontents
+
+The RF24 driver can be build as a static library with Atmel Studio 7 in order to be included as any other library in another program for the XMEGA family.
+
+Currently only the [ATXMEGA D3](https://www.microchip.com/wwwproducts/en/ATxmega64d3) family is implemented.
+
+## Preparation
+
+Create an empty GCC Static Library project in Atmel Studio 7.
+
+As not all files are required, copy the following directory structure in the project:
+
+```text
+utility\
+  ATXMegaD3\
+    compatibility.c
+    compatibility.h
+    gpio.cpp
+    gpio.h
+    gpio_helper.c
+    gpio_helper.h
+    includes.h
+    RF24_arch_config.h
+    spi.cpp
+    spi.h
+nRF24L01.h
+printf.h
+RF24.cpp
+RF24.h
+RF24_config.h
+```
+
+## Usage
+
+Add the library to your project!
+
+In the file where the `main()` is put the following in order to update the millisecond functionality:
+
+```cpp
+ISR(TCE0_OVF_vect)
+{
+    update_milisec();
+}
+```
+
+Declare the rf24 radio with `RF24 radio(XMEGA_PORTC_PIN3, XMEGA_SPI_PORT_C);`
+
+1. First parameter is the CE pin which can be any available pin on the microcontroller.
+2. Second parameter is the CS which can be on port C (**XMEGA_SPI_PORT_C**) or on port D (**XMEGA_SPI_PORT_D**).
+
+Call the `__start_timer()` to start the millisecond timer.
+
+@note The millisecond functionality is based on the TCE0 so don't use these pins as IO.
+
+@note The operating frequency of the uC is 32MHz. If you have a different frequency, change the TCE0 registers appropriately in function `__start_timer()` in **compatibility.c** file for your frequency.
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