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https://github.com/Proxmark/proxmark3.git
synced 2025-07-13 08:43:01 -07:00
fix 'hf iclass snoop'
* 'hf 15 snoop': determine and write meaningful times into trace
This commit is contained in:
pwpiwi
parent
d3bcdbdabf
commit
1ce689684f
1 changed files with 83 additions and 41 deletions
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@ -69,8 +69,11 @@
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#define DELAY_READER_TO_ARM 8
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#define DELAY_ARM_TO_READER 0
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//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader. All values should be multiples of 16
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#define DELAY_TAG_TO_ARM 32
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#define DELAY_ARM_TO_TAG 16
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#define DELAY_TAG_TO_ARM 32
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//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when snooping. All values should be multiples of 16
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#define DELAY_TAG_TO_ARM_SNOOP 32
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#define DELAY_READER_TO_ARM_SNOOP 32
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static int DEBUG = 0;
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@ -383,14 +386,13 @@ typedef struct DecodeTag {
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} DecodeTag_t;
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static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag)
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{
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static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) {
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switch(DecodeTag->state) {
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case STATE_TAG_SOF_LOW:
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// waiting for a rising edge
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if (amplitude > NOISE_THRESHOLD + DecodeTag->previous_amplitude) {
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if (DecodeTag->posCount > 10) {
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DecodeTag->threshold_sof = amplitude - DecodeTag->previous_amplitude;
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DecodeTag->threshold_sof = amplitude - DecodeTag->previous_amplitude; // to be divided by 2
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DecodeTag->threshold_half = 0;
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DecodeTag->state = STATE_TAG_SOF_RISING_EDGE;
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} else {
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@ -403,8 +405,8 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1
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break;
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case STATE_TAG_SOF_RISING_EDGE:
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if (amplitude - DecodeTag->previous_amplitude > DecodeTag->threshold_sof) { // edge still rising
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if (amplitude - DecodeTag->threshold_sof > DecodeTag->threshold_sof) { // steeper edge, take this as time reference
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if (amplitude > DecodeTag->threshold_sof + DecodeTag->previous_amplitude) { // edge still rising
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if (amplitude > DecodeTag->threshold_sof + DecodeTag->threshold_sof) { // steeper edge, take this as time reference
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DecodeTag->posCount = 1;
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} else {
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DecodeTag->posCount = 2;
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@ -447,7 +449,7 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1
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DecodeTag->sum2 = 0;
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DecodeTag->posCount = 2;
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DecodeTag->state = STATE_TAG_RECEIVING_DATA;
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FpgaDisableTracing(); // DEBUGGING
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// FpgaDisableTracing(); // DEBUGGING
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// Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d",
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// amplitude,
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// DecodeTag->threshold_sof,
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@ -466,6 +468,12 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1
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break;
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case STATE_TAG_RECEIVING_DATA:
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// FpgaDisableTracing(); // DEBUGGING
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// Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d",
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// amplitude,
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// DecodeTag->threshold_sof,
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// DecodeTag->threshold_half/4,
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// DecodeTag->previous_amplitude); // DEBUGGING
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if (DecodeTag->posCount == 1) {
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DecodeTag->sum1 = 0;
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DecodeTag->sum2 = 0;
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@ -1126,19 +1134,17 @@ void AcquireRawAdcSamplesIso15693(void)
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}
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void SnoopIso15693(void)
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{
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void SnoopIso15693(void) {
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LED_A_ON();
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FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
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BigBuf_free();
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clear_trace();
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set_tracing(true);
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// The DMA buffer, used to stream samples from the FPGA
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uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t));
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uint16_t *upTo;
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uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE];
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// Count of samples received so far, so that we can include timing
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// information in the trace buffer.
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@ -1163,16 +1169,17 @@ void SnoopIso15693(void)
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Dbprintf("Snoop started. Press PM3 Button to stop.");
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FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE);
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LED_D_OFF();
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SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
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// Setup for the DMA.
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FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER);
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upTo = dmaBuf;
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StartCountSspClk();
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FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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bool TagIsActive = false;
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bool ReaderIsActive = false;
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bool ExpectTagAnswer = false;
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uint32_t dma_start_time = 0;
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uint16_t *upTo = dmaBuf;
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// And now we loop, receiving samples.
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for(;;) {
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@ -1180,6 +1187,12 @@ void SnoopIso15693(void)
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if (behindBy == 0) continue;
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samples++;
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if (samples == 1) {
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// DMA has transferred the very first data
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dma_start_time = GetCountSspClk() & 0xfffffff0;
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}
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uint16_t snoopdata = *upTo++;
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if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content.
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@ -1198,55 +1211,84 @@ void SnoopIso15693(void)
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}
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}
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}
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samples++;
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if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
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if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) {
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FpgaDisableSscDma();
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ExpectTagAnswer = true;
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LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, samples*64, samples*64, NULL, true);
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// FpgaDisableSscDma();
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uint32_t eof_time = dma_start_time + samples*16 + 8 - DELAY_READER_TO_ARM_SNOOP; // end of EOF
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if (DecodeReader.byteCount > 0) {
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uint32_t sof_time = eof_time
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- DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers
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- 32*16 // time for SOF transfer
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- 16*16; // time for EOF transfer
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LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true);
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}
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/* And ready to receive another command. */
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DecodeReaderReset(&DecodeReader);
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/* And also reset the demod code, which might have been */
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/* false-triggered by the commands from the reader. */
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DecodeTagReset(&DecodeTag);
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upTo = dmaBuf;
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FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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}
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if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) {
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FpgaDisableSscDma();
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ReaderIsActive = false;
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ExpectTagAnswer = true;
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LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, samples*64, samples*64, NULL, true);
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// upTo = dmaBuf;
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// samples = 0;
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// FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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// continue;
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} else if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) {
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// FpgaDisableSscDma();
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uint32_t eof_time = dma_start_time + samples*16 + 16 - DELAY_READER_TO_ARM_SNOOP; // end of EOF
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if (DecodeReader.byteCount > 0) {
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uint32_t sof_time = eof_time
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- DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers
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- 32*16 // time for SOF transfer
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- 16*16; // time for EOF transfer
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LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true);
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}
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/* And ready to receive another command. */
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DecodeReaderReset(&DecodeReader);
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/* And also reset the demod code, which might have been */
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/* false-triggered by the commands from the reader. */
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DecodeTagReset(&DecodeTag);
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upTo = dmaBuf;
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FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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ReaderIsActive = false;
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ExpectTagAnswer = true;
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// upTo = dmaBuf;
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// samples = 0;
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// FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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// continue;
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} else {
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ReaderIsActive = (DecodeReader.state >= STATE_READER_RECEIVE_DATA_1_OUT_OF_4);
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}
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ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF);
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}
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if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet
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if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) {
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FpgaDisableSscDma();
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//Use samples as a time measurement
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LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, samples*64, samples*64, NULL, false);
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// FpgaDisableSscDma();
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uint32_t eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM_SNOOP; // end of EOF
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if (DecodeTag.lastBit == SOF_PART2) {
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eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS)
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}
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uint32_t sof_time = eof_time
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- DecodeTag.len * 8 * 8 * 16 // time for byte transfers
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- 32 * 16 // time for SOF transfer
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- (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer
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LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, eof_time*4, NULL, false);
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// And ready to receive another response.
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DecodeTagReset(&DecodeTag);
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DecodeReaderReset(&DecodeReader);
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ExpectTagAnswer = false;
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upTo = dmaBuf;
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FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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}
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TagIsActive = false;
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// upTo = dmaBuf;
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// samples = 0;
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// FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
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// continue;
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} else {
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TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA);
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}
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}
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}
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FpgaDisableSscDma();
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BigBuf_free();
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LEDsoff();
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