px4io: increase main stack size by 100 bytes

when loading a mixer we were sometimes getting stack corruption in
px4io inside the sscanf() code that parses the mixers. Adding 100 more
bytes fixes this

px4io: increase main stack size by 100 bytes

when loading a mixer we were sometimes getting stack corruption in
px4io inside the sscanf() code that parses the mixers. Adding 100 more
bytes fixes this

l3gd20: faster gyro interrupts

l3gd20: faster gyro interrupts

oreoled: support send_bytes ioctl

Also increase maximum command length to 24 bytes

systemcmds: added usb_connected command

this is used in APM startup to see if we should start nsh on usb when
no microSD is inserted

lsm303d: detect large fixed values and report an error

we have logs where the lsm303d gets large fixed values for long
periods. This will detect that error case and raise error_count so the
higher level sensor integration code can choose another sensor

lsm303d: detect large fixed values and report an error

we have logs where the lsm303d gets large fixed values for long
periods. This will detect that error case and raise error_count so the
higher level sensor integration code can choose another sensor

ll40ls: start a measurement after a probe

this ensures register 0 also works

FMUv2: fixed UART3 flow control pins