Rev | Line | |
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[1819] | 1 | function crcOut = calcCRC16(thePacketBytes) |
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| 2 | %Based on the C code example at: |
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| 3 | %http://www.netrino.com/Embedded-Systems/How-To/CRC-Calculation-C-Code |
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| 4 | %Uses CRC-CCIT standard checksum polynomial/formatting |
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| 5 | |
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| 6 | CRCPolynomial = hex2dec('1021'); |
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| 7 | CRC_Table = CRC_table_gen(CRCPolynomial, 16); |
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| 8 | |
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| 9 | %init_crc = hex2dec('FFFF'); |
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| 10 | init_crc = 0; |
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| 11 | myData = thePacketBytes; |
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| 12 | |
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| 13 | crc_accum = init_crc; |
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| 14 | for n=1:length(myData) |
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| 15 | x = bitshift(crc_accum,-8,16); |
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| 16 | x = bitxor(x, myData(n)); |
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| 17 | x = bitand(x,hex2dec('ff')); |
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| 18 | crc_accum = bitxor(bitshift(crc_accum,8,16),CRC_Table(x+1)); |
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| 19 | crc_tracking(n) = crc_accum; |
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| 20 | end |
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| 21 | |
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| 22 | TxCRC16 = bitand(crc_accum, hex2dec('ffff')); |
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| 23 | |
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| 24 | TxCRC16_b1 = bitand(bitshift(TxCRC16,-8,32),hex2dec('ff')); |
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| 25 | TxCRC16_b0 = bitand(TxCRC16,hex2dec('ff')); |
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| 26 | |
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| 27 | crcOut = [TxCRC16_b1 TxCRC16_b0]; |
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