This repository contains a modified version of the core and variant of the code for the Arduino Due. The IDE version used is 1.6.8. The aim of this repository is to be able to:

• Get a 20kHz PWM frequency on all PWM pins instead of 1kHz. This is done by modifying the relevant parts of variant.h
• Make it possible to use the 12 bits resolution PWM on the pins that support it (6 included to 9 included) using analogWriteResolution(), which seems broken in Arduino IDE 1.6.8. This is done by modifying the relevant parts of variant.h
• Get independantly control of the size of the RX and TX buffers for the programming port (Serial). This is done by creating new classes UARTClass_1, RingBuffer_1_TX, RingBuffer_1_RX in the Arduino DUE core and adapting all files impacted by those changes.

To install the new board version (make it available from the Arduino IDE):

• Install the Due board. On Arduino 1.6.8, it seems the Due must be installed from the library manager (not present by default)
• Locate where the Due board code is installed on your computer. This can be tricky to find. For my part (Ubuntu 14.04LTS), it was located in: /home/[username]/.arduino15/packages/arduino/hardware/sam/1.6.7/
• Add the content of the cores folder of the repository in the cores, i.e. add sam/1.6.7/cores/arduino_UART_1
• Add the content of the variants folder of the repository in the variants, i.e. add sam/1.6.7/variants/arduino_due_paddle
• Add the definition of the new board, contained in boards.txt, at the end of boards.txt that is located in sam/1.6.7/

The board will appear in your IDE as Arduino Due paddle version (Programming Port). The reason why it is called paddle version is that I developped it for building the control system of a paddle.

The sketches contained in Sketches allow to test the ADC, PWM and the RX buffer.