From 3ea7254a57d1732e72f5d4b7bf21d1d6527faa19 Mon Sep 17 00:00:00 2001 From: marshmellow42 Date: Mon, 9 Nov 2015 23:48:39 -0500 Subject: [PATCH] add checksum to viking demod --- common/lfdemod.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/common/lfdemod.c b/common/lfdemod.c index 5d19c897..c8a2c69a 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -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; -- 2.39.5