kopia lustrzana https://github.com/M17-Project/M17_Implementations
rodzic
e71b3546cb
commit
a6c75950e6
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@ -84,6 +84,7 @@ void encode_LICH(uint8_t outp[12], const uint8_t inp[6]);
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extern const uint16_t intrl_seq[SYM_PER_PLD*2];
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void reorder_bits(uint8_t outp[SYM_PER_PLD*2], const uint8_t inp[SYM_PER_PLD*2]);
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void reorder_soft_bits(uint16_t outp[SYM_PER_PLD*2], const uint16_t inp[SYM_PER_PLD*2]);
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// M17 C library - lib/math/math.c
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uint16_t q_abs_diff(const uint16_t v1, const uint16_t v2);
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@ -93,6 +94,7 @@ uint16_t soft_to_int(const uint16_t* in, const uint8_t len);
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uint16_t div16(const uint16_t a, const uint16_t b);
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uint16_t mul16(const uint16_t a, const uint16_t b);
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uint16_t soft_bit_XOR(const uint16_t a, const uint16_t b);
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uint16_t soft_bit_NOT(const uint16_t a);
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void soft_XOR(uint16_t* out, const uint16_t* a, const uint16_t* b, const uint8_t len);
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// M17 C library - lib/phy/randomize.c
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@ -153,6 +153,17 @@ uint16_t soft_bit_XOR(const uint16_t a, const uint16_t b)
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return add16(mul16(a, sub16(0xFFFF, b)), mul16(b, sub16(0xFFFF, a)));
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}
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/**
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* @brief Soft logic NOT.
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*
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* @param a Input A.
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* @return uint16_t Output = not A.
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*/
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uint16_t soft_bit_NOT(const uint16_t a)
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{
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return 0xFFFFU-a;
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}
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/**
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* @brief XOR for vectors of soft-valued logic.
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* Max length is 255.
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@ -36,7 +36,7 @@ const uint16_t intrl_seq[SYM_PER_PLD*2]=
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};
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/**
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* @brief Reorder (interleave) unpacked payload bits.
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* @brief Reorder (interleave) 368 unpacked payload bits.
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*
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* @param outp Reordered, unpacked type-4 bits.
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* @param inp Input unpacked type-2/3 bits.
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@ -46,3 +46,15 @@ void reorder_bits(uint8_t outp[SYM_PER_PLD*2], const uint8_t inp[SYM_PER_PLD*2])
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for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
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outp[i]=inp[intrl_seq[i]];
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}
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/**
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* @brief Reorder (interleave) 368 soft bits.
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*
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* @param outp Reordered soft bits.
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* @param inp Input soft bits.
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*/
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void reorder_soft_bits(uint16_t outp[SYM_PER_PLD*2], const uint16_t inp[SYM_PER_PLD*2])
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{
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for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
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outp[i]=inp[intrl_seq[i]];
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}
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@ -121,15 +121,12 @@ int main(void)
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//derandomize
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for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
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{
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if((rand_seq[i/8]>>(7-(i%8)))&1) //soft XOR. flip soft bit if "1"
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soft_bit[i]=0xFFFF-soft_bit[i];
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if((rand_seq[i/8]>>(7-(i%8)))&1) //soft NOT. flip soft bit if "1"
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soft_bit[i]=soft_bit_NOT(soft_bit[i]);
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}
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//deinterleave
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for(uint16_t i=0; i<SYM_PER_PLD*2; i++)
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{
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d_soft_bit[i]=soft_bit[intrl_seq[i]];
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}
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reorder_soft_bits(d_soft_bit, soft_bit);
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//if it is a frame
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if(!fl)
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