diff options
Diffstat (limited to 'src/byte_math.c')
| -rw-r--r-- | src/byte_math.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/byte_math.c b/src/byte_math.c new file mode 100644 index 0000000..ebe49cc --- /dev/null +++ b/src/byte_math.c @@ -0,0 +1,41 @@ +#include "byte_math.h" + +// The shape of a "spike" +uint8_t w_arr[91] = {1, 2, 4, 7, 11, 17, 24, 33, 44, 56, 70, 85, + 101, 117, 134, 151, 167, 183, 197, 210, 222, 232, 240, 247, + 251, 254, 255, 255, 253, 250, 246, 240, 234, 227, 219, 211, + 202, 194, 185, 176, 167, 158, 149, 140, 132, 123, 116, 108, + 101, 94, 87, 81, 75, 69, 64, 59, 54, 50, 46, 42, + 39, 35, 32, 30, 27, 25, 22, 20, 18, 17, 15, 14, + 12, 11, 10, 9, 8, 7, 6, 6, 5, 4, 4, 3, + 3, 3, 2, 2, 2, 1, 1}; + +uint8_t sintable[256] = { + 128, 131, 134, 137, 140, 143, 146, 149, 152, 155, 158, 162, 165, 167, 170, + 173, 176, 179, 182, 185, 188, 190, 193, 196, 198, 201, 203, 206, 208, 211, + 213, 215, 218, 220, 222, 224, 226, 228, 230, 232, 234, 235, 237, 238, 240, + 241, 243, 244, 245, 246, 248, 249, 250, 250, 251, 252, 253, 253, 254, 254, + 254, 255, 255, 255, 255, 255, 255, 255, 254, 254, 254, 253, 253, 252, 251, + 250, 250, 249, 248, 246, 245, 244, 243, 241, 240, 238, 237, 235, 234, 232, + 230, 228, 226, 224, 222, 220, 218, 215, 213, 211, 208, 206, 203, 201, 198, + 196, 193, 190, 188, 185, 182, 179, 176, 173, 170, 167, 165, 162, 158, 155, + 152, 149, 146, 143, 140, 137, 134, 131, 128, 124, 121, 118, 115, 112, 109, + 106, 103, 100, 97, 93, 90, 88, 85, 82, 79, 76, 73, 70, 67, 65, + 62, 59, 57, 54, 52, 49, 47, 44, 42, 40, 37, 35, 33, 31, 29, + 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11, 10, 9, 7, 6, + 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, + 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9, 10, 11, + 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35, 37, + 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76, + 79, 82, 85, 88, 90, 93, 97, 100, 103, 106, 109, 112, 115, 118, 121, + 124, +}; + +uint8_t calc_w(uint8_t n) +{ + if (n < 164) { + return 0; + } + + return w_arr[n - 164]; +} |