This is first part of new softserial code. Main timer code is changed, changes to rest of code are kept to minimum.
macros for BASEPRI based synchronization are added to project (atomic.h)
TIMER_PERIOD fixed in pwm_rx.c
series development board.
These boards can be picked up for less than $11, coupled with a 10DOF
sensor board they make a great development platform or cheap expandable
FC.
Pretty much all pins are available to be used, unlike on the less
capable and more expensive OLIMEXINO.
This required timer overflow events to be used in the calculation of PPM
channel data.
CC3D tested, other targets may be unstable as a result. Needs further
testing.
