ardupilot/Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/ppm_encoder.txt

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Arduino USB-To-Serial & PPM_Encoder (atmega16u2 & atmega32u2).
Instructions:
Make sure you have the latest avr-gcc / winavr installed.
Unzip the project and go to the < ./Projects/arduino-usbserial/ > directory.
To compile the project type (makefile is set for atmega16u2):
>make clean
>make
Uploading firmware to atmega32u2 using the DFU bootloader (see ../arduino-usbserial/readme.txt for instructions).
Source:
The PPM encoder code is located in the "ppm_encoder.h" file.
What it does.
The original Arduino USB to serial code should run and operate just like before.
In addition there are now 8 servo inputs using (PB0:7) PCINT interrupts, and a PPM output (PC6) using PWM - OC1A for hardware driven pin toggle and timing.
What needs to be tested:
Timing and Arduino compatibility.
Make sure that the USB-To-Serial works as it should at all baud rates, with PPM Encoder running in the background.
Also look for any timing issues with PPM Encoder when the USB-To-Serial is busy transferring data.
Happy bug hunting!