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

   1 #include "proxmark3.h"
   2 #include "apps.h"
   3 #include "BigBuf.h"
   4 #include "util.h"
   5
   6 static void RAMFUNC optimizedSnoop(void);
   7
   8 static void RAMFUNC optimizedSnoop(void)
   9 {
  10         int n = BigBuf_max_traceLen() / sizeof(uint16_t); // take all memory
  11
  12         uint16_t *dest = (uint16_t *)BigBuf_get_addr();
  13         uint16_t *destend = dest + n;
  14
  15         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame mode, 16 bits per word
  16         // Reading data loop
  17         while(dest <= destend)
  18         {
  19                 if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)
  20                 {
  21                         *dest = (uint16_t)(AT91C_BASE_SSC->SSC_RHR);
  22                         dest++;
  23                 }
  24         }
  25         //Resetting Frame mode (First set in fpgaloader.c)
  26         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
  27 }
  28
  29 void HfSnoop(int samplesToSkip, int triggersToSkip)
  30 {
  31         BigBuf_free(); BigBuf_Clear();
  32
  33         Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
  34         int trigger_cnt;
  35         LED_D_ON();
  36         // Select correct configs
  37         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  38         // Set up the synchronous serial port
  39         FpgaSetupSsc();
  40         // connect Demodulated Signal to ADC:
  41         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
  42         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SNOOP);
  43         SpinDelay(100);
  44
  45         AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame Mode For better performance on high speed data transfer.
  46
  47         trigger_cnt = 0;
  48         uint16_t r = 0;
  49         while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
  50                 WDT_HIT();
  51                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
  52                         r = (uint16_t)AT91C_BASE_SSC->SSC_RHR;
  53                         r = MAX(r & 0xff, r >> 8);
  54                         if (r >= 240) {
  55                                 if (++trigger_cnt > triggersToSkip)
  56                                         break;
  57                         }
  58                 }
  59         }
  60
  61         if(!BUTTON_PRESS()) {
  62                 int waitcount = samplesToSkip; // lets wait 40000 ticks of pck0
  63                 while(waitcount != 0) {
  64                         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY))
  65                                 waitcount--;
  66                 }
  67                 optimizedSnoop();
  68                 Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r);
  69         }
  70
  71         DbpString("HF Snoop end");
  72         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
  73         LED_D_OFF();
  74 }
  75