return bestErr;
}
+uint32_t manchesterEncode2Bytes(uint16_t datain) {
+ uint32_t output = 0;
+ uint8_t curBit = 0;
+ for (uint8_t i=0; i<16; i++) {
+ curBit = (datain >> (15-i) & 1);
+ output |= (1<<(((15-i)*2)+curBit));
+ }
+ return output;
+}
+
//by marshmellow
//encode binary data into binary manchester
int ManchesterEncode(uint8_t *BitStream, size_t size)
return -5;
}
+// by marshmellow
+// find viking preamble 0xF200 in already demoded data
+int VikingDemod_AM(uint8_t *dest, size_t *size) {
+ if (justNoise(dest, *size)) return -1;
+ //make sure buffer has data
+ if (*size < 64*2) return -2;
+
+ size_t startIdx = 0;
+ uint8_t preamble[] = {1,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+ uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
+ if (errChk == 0) return -4; //preamble not found
+ uint32_t checkCalc = bytebits_to_byte(dest+startIdx,8) ^ bytebits_to_byte(dest+startIdx+8,8) ^ bytebits_to_byte(dest+startIdx+16,8)
+ ^ bytebits_to_byte(dest+startIdx+24,8) ^ bytebits_to_byte(dest+startIdx+32,8) ^ bytebits_to_byte(dest+startIdx+40,8)
+ ^ bytebits_to_byte(dest+startIdx+48,8) ^ bytebits_to_byte(dest+startIdx+56,8);
+ if ( checkCalc != 0xA8 ) return -5;
+ if (*size != 64) return -5;
+ //return start position
+ return (int) startIdx;
+}
+
// by marshmellow
// takes a array of binary values, start position, length of bits per parity (includes parity bit),
// Parity Type (1 for odd; 0 for even; 2 Always 1's), and binary Length (length to run)
*size = numBits;
return errCnt;
}
-// on successful return 1 otherwise return 0
-int VikingDecode(uint8_t *BitStream,
- size_t size,
- size_t *startIdx,
- uint8_t *id_bits,
- size_t id_bits_size)
-{
- //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future
- // otherwise could be a void with no arguments
- //set defaults
- uint32_t i = 0;
- uint32_t lastcheckindex = size - (id_bits_size * 2);
- int found = 0;
- while (i < lastcheckindex)
- {
- if (memcmp(BitStream + i,id_bits,id_bits_size) == 0)
- {
- *startIdx = i;
- found = 1;
- break;
- }
- i++;
- }
- return found;
-}
-
-