Hi Dan, So I have a use for a struct with 4 single-bit members.
currently vx3 (And others) have a separate structure that contains some bitmask fields for various flags. They are only 4 bits per channel. However, due to bitwise constraints, it seems we are left with doing something like: struct { u8 odd_flagA:1, odd_flagB:1, odd_flagC:1, odd_flagD:1, even_flagA:1, even_flagB:1, even_flagC:1, even_flagD:1; } flags [50];
and then using some unholy trickery to interleave this out where we need it - it's very ugly, and confusing.
What I'd like to do is take advantage of the simple "bit" type in bitwise. So I thought i'd simplify the above to: struct { bit flagA; bit flagB; bit flagC; bit flagD; } flags [100];
But when I do this bitwise.py croaks with "bit array must be divisible by 8." (trace below).
Why is it this way? The second form would be much simpler and cleaner overall in the code to work with. Is there some alignment concern? Is there any provision for a data type of less than a byte?
File "/Users/jens/build/chirp.hg/chirp/vx3.py", line 372, in process_mmap self._memobj = bitwise.parse(MEM_FORMAT, self._mmap) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 857, in parse return p.parse(ast) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 850, in parse self.parse_block(lang) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 841, in parse_block self.parse_struct(d) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 822, in parse_struct return self.parse_struct_decl(struct[0][1]) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 805, in parse_struct_decl self.parse_block(block) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 843, in parse_block self.parse_defn(d) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 773, in parse_defn gen = self.do_bitarray(i, count) File "/Users/jens/build/chirp.hg/chirp/bitwise.py", line 745, in do_bitarray raise ValueError("bit array must be divisible by 8.")