LightTelemetry v2: en route to ground OSD.

LTM protocol has been extended to prepare the future ground OSD for Ghettostation.
I think I have some pretty good refresh rate of all needed data for that purpose.
We now have 3 different frames:

- GPS frame (G): Latitude, Longitude, Ground Speed, Altitude, Number of sats, GPS fix type

- Attitude frame (A): Pitch, Roll, Heading

- Sensors/Status frame (S): Battery Voltage, Current consumed, RSSI, Airspeed,  Armed state, Failsafe state, Flight mode

	1200 bauds	2400 bauds+
G frame	2hz	5hz
A frame	5hz	10hz
S frame	2hz	5hz

GPS frame

0x24

0x54

0x47

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0xFF

$

T

G

Latitude (degre*10000000)

Longitude (degre*10000000)

Ground Speed (m/s)

Altitude (cm)

first 2 bits: Fix last 6 bits: Sats

CRC xor byte 4 to 15

Start 1

Start 2

Frame ID

Payload

Checksum

Attitude frame

0x24	0x54	0x41	0x00	0x00	0x00	0x00	0x00	0x00	0xFF
$	T	A	Pitch (degre)		Roll (degre)		Heading (degre)		CRC xor byte 4 to 9
Start 1	Start 2	Frame ID	Payload						Checksum

Sensors/Status frame

0x24	0x54	0x53	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0xFF
$	T	S	Vbat (mv)		Consumed current (ma)		RSSI	Airspeed (m/s)	1st bit: armed 2nd bit: failsafe latest: flight mode	CRC xor byte 4 to 10
Start 1	Start 2	Frame ID	Payload							Checksum

Ghettostation, Taulabs & Baseflight have all been updated to ltm v2 on my github.

You still can use my TL & BF builds here:  Google drive

There's almost no lag in the attitude data, that's a really good news, I was a bit afraid that such low baudrate would prevent a nice smooth horizon bar. 
Ground base OSD will be a really cool feature. Less cables on air seems better to me.