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[Fix] added original comments back; use same bitwise operation for even check

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Signed-off-by: Andy Shieh <hsieandy@gmail.com>
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Andy Shieh 2025-07-28 22:41:18 +10:00 • committed by GitHub
commit 7e7fe1837e
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client/src/cmdlfindala.c
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@ -1163,14 +1163,21 @@ int getIndalaBits(uint8_t fc, uint16_t cn, uint8_t *bits) {
chk += ((cn >> 2) & 1); //y14 == 89 - 30 = 59
chk += (cn & 1); //y16 == 71 - 30 = 41
if ((chk % 2) == 0) { // If the sum is even, checksum is '10' (binary) = 2.
if ((chk & 1) == 0) { // If the sum is even, checksum is '10' (binary) = 2.
bits[62] = 1;
bits[63] = 0;
} else { // If the sum is odd, checksum is '01' (binary) = 1.
bits[62] = 0;
bits[63] = 1;
}
// add parity
// bits[34] = 1; // p1 64 - 30 = 34
// bits[38] = 1; // p2 68 - 30 = 38
// 92 = 62
// 93 = 63
bits[34] = 0; // parity for odd bits
bits[38] = 0; // parity for even bits
uint8_t p1 = 1;