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I haven’t dealt with programming against hardware devices in a long while and have forgotten pretty much all the basics.
I have a spec of what I should send in a byte and each bit is defined from the most significant bit (bit7) to the least significant (bit 0). How do i build this byte? From MSB to LSB, or vice versa?
If these bits are being ‘packeted’ (which they usually are), then the order of bits is the native order, 0 being the LSB, and 7 being the MSB. Bits are not usually sent one-by-one, but as bytes (usually more than one byte…).
According to wikipedia, bit ordering can sometimes be from 7->0, but this is probably the rare case.