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Diffstat (limited to 'src/ppu/internals.h')
| -rw-r--r-- | src/ppu/internals.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/ppu/internals.h b/src/ppu/internals.h index 7b60255..6e9dda7 100644 --- a/src/ppu/internals.h +++ b/src/ppu/internals.h @@ -4,6 +4,11 @@ #include "ppu/types.h" +/** @brief generate bitmask with `n` bits set to one from LSB */ +#define HH_MASK(n) ((1 << (n))-1) +/** @brief resize `in` to `upper downto lower` like in vhdl */ +#define HH_RESIZE(in, upper, lower) ((((hh_ppu_data_t)(in)) & (HH_MASK(upper+1-lower) << lower)) >> lower) + typedef struct { hh_ppu_addr_t offset; hh_ppu_addr_t size; |