argdata in the subcommand is initialized as follows: <code>((u8*)cmd_argdata)[pos] = u8_in[pos2] | u8_in[pos3]<<4;</code> Hence, 4bits from pairs of 2-bytes of the input struct are combined to write to the subcommand. Only the low 4bits of each used byte in the struct is used. This is written to stack initially, then copied to the actual cmd_argdata (the data immediately following the subcommandID byte). There's a total of 0x1B-bytes of cmd_argdata initialized from this. | argdata in the subcommand is initialized as follows: <code>((u8*)cmd_argdata)[pos] = u8_in[pos2] | u8_in[pos3]<<4;</code> Hence, 4bits from pairs of 2-bytes of the input struct are combined to write to the subcommand. Only the low 4bits of each used byte in the struct is used. This is written to stack initially, then copied to the actual cmd_argdata (the data immediately following the subcommandID byte). There's a total of 0x1B-bytes of cmd_argdata initialized from this. |