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SAB Goblin 570

S-BUS protocol
--------------

The protocol is 25 Byte long and is send every 14ms (analog mode) or 7ms (highspeed mode).
One Byte = 1 startbit + 8 databit + 1 paritybit + 2 stopbit (8E2), baudrate = 100'000 bit/s
The highest bit is send first. The logic is inverted (Level High = 1)

[startbyte] [data1] [data2] .... [data22] [flags][endbyte]

startbyte = 11110000b (0xF0)

data 1-22 = [ch1, 11bit][ch2, 11bit] .... [ch16, 11bit] (ch# = 0 bis 2047)
channel 1 uses 8 bits from data1 and 3 bits from data2
channel 2 uses last 5 bits from data2 and 6 bits from data3
etc.

flags = bit7 = ch17 = digital channel (0x80)
bit6 = ch18 = digital channel (0x40)
bit5 = Frame lost, equivalent red LED on receiver (0x20)
bit4 = failsafe activated (0x10)
bit3 = n/a
bit2 = n/a
bit1 = n/a
bit0 = n/a

endbyte = 00000000b

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