mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-21 02:03:18 +00:00
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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#include "parity.h"
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uint32_t __paritysi2(uint32_t a) {
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uint32_t x = (uint32_t)a;
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x ^= x >> 16;
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x ^= x >> 8;
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x ^= x >> 4;
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return (0x6996 >> (x & 0xF)) & 1;
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}
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static const uint8_t g_odd_byte_parity[256] = {
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1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0,
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1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1,
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1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1,
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0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0,
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1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1,
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0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0,
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0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1,
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0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
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1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1};
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#define ODD_PARITY8(x) \
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{ g_odd_byte_parity[x] }
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#define EVEN_PARITY8(x) \
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{ !g_odd_byte_parity[x] }
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uint8_t oddparity8(const uint8_t x) {
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return g_odd_byte_parity[x];
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}
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uint8_t evenparity8(const uint8_t x) {
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return !g_odd_byte_parity[x];
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}
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uint8_t evenparity16(uint16_t x) {
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#if !defined __GNUC__
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x ^= x >> 8;
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return EVEN_PARITY8(x);
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#else
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return (__builtin_parity(x) & 0xFF);
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#endif
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}
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uint8_t oddparity16(uint16_t x) {
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#if !defined __GNUC__
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x ^= x >> 8;
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return ODD_PARITY8(x);
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#else
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return !__builtin_parity(x);
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#endif
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}
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uint8_t evenparity32(uint32_t x) {
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#if !defined __GNUC__
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x ^= x >> 16;
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x ^= x >> 8;
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return EVEN_PARITY8(x);
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#else
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return (__builtin_parity(x) & 0xFF);
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#endif
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}
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uint8_t oddparity32(uint32_t x) {
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#if !defined __GNUC__
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x ^= x >> 16;
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x ^= x >> 8;
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return ODD_PARITY8(x);
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#else
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return !__builtin_parity(x);
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#endif
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}
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