2 header field that is 19 bits long. I'm trying to pack the number 921 decimal into hex into it. Least Significant Byte first.
Packing into 24 bits is easy:
921.0 = 0x0399
binary:
9 9 0 3 0 0
1001 1001 0000 0011 0000 0000
and done. Result: 0x990300
How do I do pack this into 19 bits?