This is the code for the new KFly PCB.

HW Specs:
* ARM Cortex-M4F STM32F405 CPU w/ FPU and DSP @ 168MHz
* MPU-6050 accelerometer/gyroscope
* HMC5883L magnetometer
* MS5611-01BA01 pressure sensor
* 8 PWM outputs (50/400Hz)
* 4 expansion connectors (3 UARTs & 1 CAN)
* 6 slot RC input connector with support for (C)PPM up to 8 channels in and signal strength

SW Specs:
* Runs FreeRTOS (with FPU support) with an Hardware Abstraction Layer on top for fast application development
* USB Bootloader - no need for an external programmer!
* Quaternion based Square-Root Multuiplicative Extended Kalman Filter (SR-MEKF) provides attitude estimation
* "Control signal to Motor"-mixing for different types of frames
* Flight control: Rate mode, Attitude mode and more to come

TODO List:
[X] Fix catalog structure to Modules
[ ] Migrate comments to Doxygen
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[ ] Finish the bootloader
[X] Add callback for I2C finished transfer
[ ] Add SPI drivers for external Flash
[ ] Add all serial manager parsers
[X] Make sensor readings interrupt driven - Priority!
[X] Finish the HMC5883L code - Priority!
[X] Add interrupts on pin change for sensor data available - Priority!
[X] Add PWM out for motors
[ ] Add (C)PPM/PWM in for control
[ ] Add support for all the communication interfaces
[ ] Code the Attitude/Position Estimation
[X] Code the controller - Priority!
[X] Code the motor mixer - Priority!