innd / crwper-flyblind

FlySight Firmware

FlySight is an audible GPS intended to give wingsuit pilots real-time feedback on statistics like glide ratio. The FlySight firmware is open-source and lives in this repository.

Hardware

FlySight uses an Atmel AT90USB646 microcontroller clocked at 8 MHZ. This chip has 64 KB of flash memory, 4 KB of RAM, an onboard USB PHY, and enough I/O to connect everything else. Other components of interest include:

• the GPS module (a u-blox NEO-6Q or NEO-7N),
• a micro-SD card connected via SPI (512 MB as shipped),
• a red and a green LED,
• a lithium polymer battery and charging circuit,
• an override-able power switch (the MCU can keep itself on even as the switch turns off), and
• an audio output system driven by the MCU's PWM support.

There is a schematic if you care to see how everything is connected.

Structure

The FlySight code lives in FlySight/.

The firmware uses LUFA as a submodule in vendor/lufa/ for USB access. It also uses FatFS as a copy in FlySight/FatFS/ for FAT16.

Building

The microcontroller is in the Atmel AVR family. As such, building the firmware requires avr-gcc.

On UNIXy systems, install an AVR toolchain and run make. Some suggestions for getting a suitable toolchain:

• Ubuntu Linux: apt-get install build-essential gcc-avr binutils-avr avr-libc
• Mac OS X: check out CrossPack, use homebrew to tap e.g. homebrew-avr/homebrew-embedded, or use the binaries embedded in the Arduino IDE

On Windows, the WinAVR toolchain is recommended:

• WinAVR

Contributing

1. Fork the project
2. Update submodules (git submodule init and git submodule update)
3. Create a feature branch (git checkout -b shiny_new_feature)
4. Develop
5. Commit your changes (git commit -a, being sure to give a useful message)
6. Push to your branch (git push origin shiny_new_feature)
7. Create a pull request