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arduino-cli/libraries/RF24/utility/ATXMegaD3/README.md

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+This is a fork from **http://tmrh20.github.io/RF24** which can be build as a static library for Atmel Studio 7.
+
+Not all files are needed.
+
+Just copy the following structure into a GCC Static Library project in AS7:
+```
+utility\
+  ATXMega256D3\
+    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
+```
+
+Only ATXMega256D3 is supported right now!
+
+## Notes
+The millisecond functionality is based on the TCE0 so don't use these pins as IO.
+
+The operating frequency of the uC is 32MHz. If else change the TCE0 registers appropriatly in function **__start_timer()** in **compatibility.c** file for your frequency. 
+
+
+## Usage
+Add the library to your project!
+In the file where the **main()** is put the following in order to update the millisecond functionality:
+```
+ISR(TCE0_OVF_vect)
+{
+	update_milisec();
+}
+```
+
+Declare the rf24 radio with **RF24 radio(XMEGA_PORTC_PIN3, XMEGA_SPI_PORT_C);**
+
+First parameter is the CE pin which can be any available pin on the uC.
+
+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.
+
+
+
+** For further information please see http://tmrh20.github.io/RF24 for all documentation**