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add checksum to viking demod

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marshmellow42 2015-11-09 23:48:39 -05:00
parent 415274a7c3
commit 3ea7254a57
1 changed files with 4 additions and 1 deletions
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5
common/lfdemod.c
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@ -610,7 +610,10 @@ int VikingDemod_AM(uint8_t *dest, size_t *size) {
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;