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with em410xread, retest if we read our bits the wrong way (1=0 and 0=1)
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1 changed files with 17 additions and 5 deletions
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@ -262,6 +262,7 @@ static void CmdEM410xread(char *str)
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int i, j, clock, header, rows, bit, hithigh, hitlow, first, bit2idx, high, low;
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int parity[4];
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char id[11];
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int retested = 0;
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int BitStream[MAX_GRAPH_TRACE_LEN];
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high = low = 0;
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@ -315,6 +316,7 @@ static void CmdEM410xread(char *str)
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BitStream[bit2idx++] = bit;
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}
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retest:
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/* We go till 5 before the graph ends because we'll get that far below */
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for (i = 1; i < bit2idx - 5; i++)
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{
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@ -363,7 +365,7 @@ static void CmdEM410xread(char *str)
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/* Stop any loops */
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go = 0;
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break;
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return;
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}
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/* Crap! Incorrect parity or no stop bit, start all over */
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@ -388,6 +390,16 @@ static void CmdEM410xread(char *str)
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header = 0;
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}
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}
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/* if we've already retested after flipping bits, return */
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if (retested++)
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return;
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/* if this didn't work, try flipping bits */
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for (i = 0; i < bit2idx; i++)
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BitStream[i] ^= 1;
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goto retest;
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}
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/* emulate an EM410X tag
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