From 5b95953d4227d9af4b5a5f20156b668bba55aac8 Mon Sep 17 00:00:00 2001 From: pwpiwi Date: Tue, 2 Jun 2015 22:27:14 +0200 Subject: [PATCH] fixing iso14443b (issue #103): - most significant bit of tag data (which happens to be the sign bit) had been dropped when snooping (FPGA change) - avoid trying to decode both tag and reader data when snooping (we don't have the time to do so). --- armsrc/iso14443b.c | 96 ++++++++++++++++++++++------------------ fpga/fpga_hf.bit | Bin 42175 -> 42175 bytes fpga/hi_read_rx_xcorr.v | 13 +++--- 3 files changed, 60 insertions(+), 49 deletions(-) diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 8add8f9c..d6595586 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -158,7 +158,6 @@ static int Handle14443UartBit(int bit) { switch(Uart.state) { case STATE_UNSYNCD: - LED_A_OFF(); if(!bit) { // we went low, so this could be the beginning // of an SOF @@ -272,8 +271,7 @@ static int Handle14443UartBit(int bit) break; } - // This row make the error blew circular buffer in hf 14b snoop - //if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error + if (Uart.state == STATE_UNSYNCD) LED_A_OFF(); return FALSE; } @@ -1054,17 +1052,17 @@ void ReadSTMemoryIso14443(uint32_t dwLast) //----------------------------------------------------------------------------- /* * Memory usage for this function, (within BigBuf) - * 0-4095 : Demodulated samples receive (4096 bytes) - DEMOD_TRACE_SIZE - * 4096-6143 : Last Received command, 2048 bytes (reader->tag) - READER_TAG_BUFFER_SIZE - * 6144-8191 : Last Received command, 2048 bytes(tag->reader) - TAG_READER_BUFFER_SIZE - * 8192-9215 : DMA Buffer, 1024 bytes (samples) - DEMOD_DMA_BUFFER_SIZE + * Last Received command (reader->tag) - MAX_FRAME_SIZE + * Last Received command (tag->reader) - MAX_FRAME_SIZE + * DMA Buffer, 1024 bytes (samples) - DMA_BUFFER_SIZE + * Demodulated samples received - all the rest */ void RAMFUNC SnoopIso14443(void) { // We won't start recording the frames that we acquire until we trigger; // a good trigger condition to get started is probably when we see a // response from the tag. - int triggered = TRUE; + int triggered = TRUE; // TODO: set and evaluate trigger condition FpgaDownloadAndGo(FPGA_BITSTREAM_HF); BigBuf_free(); @@ -1109,7 +1107,10 @@ void RAMFUNC SnoopIso14443(void) FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE); uint8_t parity[MAX_PARITY_SIZE]; LED_A_ON(); - + + bool TagIsActive = FALSE; + bool ReaderIsActive = FALSE; + // And now we loop, receiving samples. for(;;) { int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & @@ -1136,49 +1137,56 @@ void RAMFUNC SnoopIso14443(void) samples += 2; - if(Handle14443UartBit(ci & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); - } - if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if(Handle14443UartBit(ci & 0x01)) { + if(triggered && tracing) { + GetParity(Uart.output, Uart.byteCnt, parity); + LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); + } + if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - /* And ready to receive another command. */ - UartReset(); - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - DemodReset(); - } - if(Handle14443UartBit(cq & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples, parity, TRUE); + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); } - if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); + if(Handle14443UartBit(cq & 0x01)) { + if(triggered && tracing) { + GetParity(Uart.output, Uart.byteCnt, parity); + LogTrace(Uart.output,Uart.byteCnt,samples, samples, parity, TRUE); + } + if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - /* And ready to receive another command. */ - UartReset(); - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - DemodReset(); + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); + } + ReaderIsActive = (Uart.state != STATE_UNSYNCD); } - if(Handle14443SamplesDemod(ci, cq)) { + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time + if(Handle14443SamplesDemod(ci, cq)) { - //Use samples as a time measurement - if(tracing) - { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); - LogTrace(Demod.output, Demod.len,samples, samples, parity, FALSE); - } - triggered = TRUE; - LED_A_OFF(); - LED_B_ON(); + //Use samples as a time measurement + if(tracing) + { + uint8_t parity[MAX_PARITY_SIZE]; + GetParity(Demod.output, Demod.len, parity); + LogTrace(Demod.output, Demod.len,samples, samples, parity, FALSE); + } + triggered = TRUE; + LED_A_OFF(); + LED_B_ON(); - // And ready to receive another response. - DemodReset(); + // And ready to receive another response. + DemodReset(); + } + TagIsActive = (Demod.state != DEMOD_UNSYNCD); } + WDT_HIT(); if(!tracing) { diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index 20fb2bd4401254d899d6273451bfccbd827f562b..53078a782422c09596f006d95c85ae45da20072d 100644 GIT binary patch literal 42175 zcmeIb4Rl=PbvC-s&&bD`k>^O3QiUILG!kTR#`0JK;}{{mmIaw4PEZq)xLvuq197RF zy7@$!uh&U)(^n$_@(=Mq+{8`Xtg&$tg}Ckbry#(EV8 zAME?=_nbL1vPo9f`qo|du2s~v%Ffa2bKbwbpZ)B;-&Zs{TJ-*pNV}Ql-rD!)H~*ij 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because it can be negative as well +reg signed [13:0] corr_i_accum; +reg signed [13:0] corr_q_accum; reg signed [7:0] corr_i_out; reg signed [7:0] corr_q_out; @@ -114,12 +116,13 @@ begin begin if(snoop) begin - corr_i_out <= {corr_i_accum[12:6], after_hysteresis_prev}; - corr_q_out <= {corr_q_accum[12:6], after_hysteresis}; + // highest 7 significant bits of tag signal (signed), 1 bit reader signal: + corr_i_out <= {corr_i_accum[13:7], after_hysteresis_prev}; + corr_q_out <= {corr_q_accum[13:7], after_hysteresis}; end else begin - // Only correlations need to be delivered. + // highest 8 significant bits of tag signal corr_i_out <= corr_i_accum[13:6]; corr_q_out <= corr_q_accum[13:6]; end -- 2.39.5