[OneRCFW][v0.1.0]

[Arduino][FlyCtrl][v0.1.0]

OneRCLIB:

1. MPU6050:
    - Enable 42Hz LPF.
    - Set sampling rate to 800 Hz.

2. GPS:
    - Implement simulating UART function by combining HW timer 0, GPIO D5, D6.
    - UART baud rate: 9600.
    - Add ublox NEO-6M driving function.
        * Default update rate: 5Hz.
        * Only enable GPRMC and GPGGA NMEA messages.

3. Arduino UART:
    - Change default baud rate to 57600. 

4. Arduino ADC:
    - Higher the ADC frequency to 250 KHz.
    - Change ADC pin assignment.
        * CH0: A6: AIRPLANE_ROLL_SCALE_CH
        * CH1: A1: AIRPLANE_PITCH_SCALE_CH 
        * CH2: A2: AIRPLANE_YAW_SCALE_CH (Unused)
        * CH3: A3: AIRPLANE_NAV_LOITER_CH)
        * CH4: A7: AIRPLANE_MODE_DIPS_CH

5. RCIN:
    - Change pin assignment.
        * Logic CH 0 = Arduino D02 / AVR PD2 / PCINT 18 (PC group 2)
        * Logic CH 1 = Arduino D04 / AVR PD4 / PCINT 20 (PC group 2)
        * Logic CH 2 = Arduino D07 / AVR PD7 / PCINT 23 (PC group 2)
        * Logic CH 3 = Arduino D12 / AVR PB4 / PCINT 4 (PC group 0)
        * Logic CH 4 = Arduino D08 / AVR PB0 / PCINT 0 (PC group 0)
    - Add RCIN calibration functions:
        * Maximum and minimum RCIN pulse width calibration.
        * Natural position calibration.
    - Add failsafe configuration function.

OneRCAirplane:

- Update FW date definition (2017/12/16).
- Change maximum PID integral limitation of roll, pitch and yaw to +- 5 degree.
- Add "return to home" mode based on GPS navigation information.
    * The maximum bank angle setting is 30 degree.
    * Adjust pitch PID gain and pitch compensation according to current roll angle.

OneRCSchematic:

1. Add current FC schematic, layout and gerber files.

FW status and environment:

1. Arduino 1.6.9
2. Using Arduino Nano bootloader.
3. The MCU is running in 16Mhz mode.
4. Current FW size: FLASH usage = 30,242 bytes (98%), SRAM usage = 1,560 bytes (76%).

What to do for next?

#. This version FW contains auto level and GPS return to home function:
    - The auto level function is quite stable now.
    - The GPS return to home function is unstable, still need to do more test for this.
        * I did some field trials few times in very windy day before.
    - The latest test video: https://www.youtube.com/watch?v=OjTpQ1Ft-OE
        * Maximum bank angle setting: 45 degree, already reduce the bank angle limitation to 30 degree, but never test it.
        * Add "adjusting pitch PID gain according to current bank(roll) angle", but never test it.