git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/hfsnoop.c

   1 //-----------------------------------------------------------------------------
   2 // piwi, 2019
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Routines to get sample data from FPGA.
   9 //-----------------------------------------------------------------------------
  10
  11 #include "hfsnoop.h"
  12
  13 #include "proxmark3.h"
  14 #include "BigBuf.h"
  15 #include "util.h"
  16 #include "apps.h"
  17 #include "usb_cdc.h"    // for usb_poll_validate_length
  18 #include "fpga.h"
  19 #include "fpgaloader.h"
  20
  21 static void RAMFUNC optimizedSnoop(void)
  22 {
  23         int n = BigBuf_max_traceLen() / sizeof(uint16_t); // take all memory
  24
  25         uint16_t *dest = (uint16_t *)BigBuf_get_addr();
  26         uint16_t *destend = dest + n;
  27
  28         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame mode, 16 bits per word
  29         // Reading data loop
  30         while(dest <= destend)
  31         {
  32                 if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)
  33                 {
  34                         *dest = (uint16_t)(AT91C_BASE_SSC->SSC_RHR);
  35                         dest++;
  36                 }
  37         }
  38         //Resetting Frame mode (First set in fpgaloader.c)
  39         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
  40 }
  41
  42 void HfSnoop(int samplesToSkip, int triggersToSkip)
  43 {
  44         BigBuf_free(); BigBuf_Clear();
  45
  46         Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
  47         int trigger_cnt;
  48         LED_D_ON();
  49         // Select correct configs
  50         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  51         // Set up the synchronous serial port
  52         FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SNOOP);
  53         // connect Demodulated Signal to ADC:
  54         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
  55         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SNOOP);
  56         SpinDelay(100);
  57
  58         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame Mode For better performance on high speed data transfer.
  59
  60         trigger_cnt = 0;
  61         uint16_t r = 0;
  62         while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
  63                 WDT_HIT();
  64                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
  65                         r = (uint16_t)AT91C_BASE_SSC->SSC_RHR;
  66                         r = MAX(r & 0xff, r >> 8);
  67                         if (r >= 240) {
  68                                 if (++trigger_cnt > triggersToSkip)
  69                                         break;
  70                         }
  71                 }
  72         }
  73
  74         if(!BUTTON_PRESS()) {
  75                 int waitcount = samplesToSkip; // lets wait 40000 ticks of pck0
  76                 while(waitcount != 0) {
  77                         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY))
  78                                 waitcount--;
  79                 }
  80                 optimizedSnoop();
  81                 Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r);
  82         }
  83
  84         DbpString("HF Snoop end");
  85         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
  86         LED_D_OFF();
  87 }
  88
  89 void HfPlot(void)
  90 {
  91         uint8_t *buf = ToSend;
  92         uint8_t *this_buf = buf;
  93
  94         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  95         FpgaSetupSsc(FPGA_MAJOR_MODE_HF_GET_TRACE);
  96         AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;   // Disable DMA Transfer
  97         AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) this_buf; // start transfer to this memory address
  98         AT91C_BASE_PDC_SSC->PDC_RCR = USB_CMD_DATA_SIZE;   // transfer this many samples
  99         buf[0] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;         // clear receive register
 100         AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN;    // Start DMA transfer
 101         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_GET_TRACE);   // let FPGA transfer its internal Block-RAM
 102
 103         LED_B_ON();
 104         for(size_t i = 0; i < FPGA_TRACE_SIZE; i += USB_CMD_DATA_SIZE) {
 105                 // prepare next DMA transfer:
 106                 uint8_t *next_buf = buf + ((i + USB_CMD_DATA_SIZE) % (2 * USB_CMD_DATA_SIZE));
 107                 AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t)next_buf;
 108                 AT91C_BASE_PDC_SSC->PDC_RNCR = USB_CMD_DATA_SIZE;
 109                 size_t len = MIN(FPGA_TRACE_SIZE - i, USB_CMD_DATA_SIZE);
 110                 while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX))) ; // wait for DMA transfer to complete
 111                 cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, i, len, FPGA_TRACE_SIZE, this_buf, len);
 112                 this_buf = next_buf;
 113         }
 114         // Trigger a finish downloading signal with an ACK frame
 115         cmd_send(CMD_ACK, 1, 0, FPGA_TRACE_SIZE, 0, 0);
 116         LED_B_OFF();
 117         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 118 }