* CF/BF - Set STM32F7 SPI FAST clock to 13.5Mhz - Gyros not stable at
27mhz.
* CF/BF - Initial SPRacingF7DUAL commit.
Support two simultaneous gyro support (code by Dominic Clifton and Martin Budden)
There are new debug modes so you can see the difference between each gyro.
Notes:
* spi bus instance caching broke spi mpu detection because the detection
tries I2C first which overwrites the selected bus instance when using
dual gyro.
* ALL other dual-gyro boards have one sensor per bus. SPRacingF7DUAL is has two per bus and thus commit has a lot of changes to fix SPI/BUS/GYRO initialisation issues.
* CF/BF - Add SPRacingF4EVODG target.
This target adds a second gyro to the board using the SPI pads on the back of the board.
* CF/BF - Temporarily disable Gyro EXTI pin to allow NEO target to build.
Noise and momentary spikes in gyro data (particularly in 32K mode) were causing false triggering of the gyro overflow detection. Changing to using filtered instead of raw gyro data eliminates the false triggering.
Also adjusted the trigger and reset rates slightly (approx. 1950dps and 1850dps respectively).
Fixed bug for gyros that may not be +-2000dps full scale. The trigger threshold will be 97.5% full-scale and reset at 92.5% (corresponds to 1950 and 1850 for 2000dps gyros).
Changed the triggering phase so that in addition to the pidSum needing to exceed runaway_takeoff_threshold, the gyro rate on any axis must exceed a threshold value to indicate the quad is actually moving. The threshold for the yaw axis is much higher since the torque of the motors can still yaw the craft without props.
Noise and momentary spikes in gyro data (particularly in 32K mode) were causing false triggering of the gyro overflow detection.
Also adjusted the trigger and reset rates slightly (approx. 1950dps and 1850dps respectively).
Optimized the gyro loop slightly by eliminating 3 floating point multiplies.
Fixed bug for gyros that may not be +-2000dps full scale.
* Generate 'k' per the code for the PT1
* Adjust function prototypes/functions to accept f_cut/dT where applicable
* Adjust gyro configuration, parameter group, interface settings to suit
