diff options
Diffstat (limited to 'apps/lcd3310/bits.h')
| -rw-r--r-- | apps/lcd3310/bits.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/apps/lcd3310/bits.h b/apps/lcd3310/bits.h new file mode 100644 index 0000000..434c390 --- /dev/null +++ b/apps/lcd3310/bits.h @@ -0,0 +1,21 @@ +#pragma once + +/* +http://stackoverflow.com/a/5048661/245614 +*/ +/* +NUM_ARGS(...) evaluates to the literal number of the passed-in arguments. +*/ +#define _NUM_ARGS2(X, X64, X63, X62, X61, X60, X59, X58, X57, X56, X55, X54, X53, X52, X51, X50, X49, X48, X47, X46, X45, X44, X43, X42, X41, X40, X39, X38, X37, X36, X35, X34, X33, X32, X31, X30, X29, X28, X27, X26, X25, X24, X23, X22, X21, X20, X19, X18, X17, X16, X15, X14, X13, X12, X11, X10, X9, X8, X7, X6, X5, X4, X3, X2, X1, N, ...) N +#define NUM_ARGS(...) _NUM_ARGS2(0, __VA_ARGS__, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) + +#define BIT_MASK_1(a) (1 << a) +#define BIT_MASK_2(a, b) (BIT_MASK_1(a) | BIT_MASK_1(b)) +#define BIT_MASK_3(a, b, c) (BIT_MASK_2(a, b) | BIT_MASK_1(c)) +#define BIT_MASK_4(a, b, c, d) (BIT_MASK_3(a, b, c) | BIT_MASK_1(d)) +#define BIT_MASK_5(a, b, c, d, e) (BIT_MASK_4(a, b, c, d) | BIT_MASK_1(e)) +#define BIT_MASK_6(a, b, c, d, e, f) (BIT_MASK_5(a, b, c, d, e) | BIT_MASK_1(f)) + +#define _BIT_MASK_3(N, ...) BIT_MASK_ ## N(__VA_ARGS__) +#define _BIT_MASK_2(N, ...) _BIT_MASK_3(N, __VA_ARGS__) +#define BIT_MASK(...) _BIT_MASK_2(NUM_ARGS(__VA_ARGS__), __VA_ARGS__) |