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[proxmark3-svn] / armsrc / hfsnoop.c
1 #include "proxmark3.h"
2 #include "apps.h"
3 #include "BigBuf.h"
4 #include "util.h"
5 #include "usb_cdc.h" // for usb_poll_validate_length
6
7 static void RAMFUNC optimizedSnoop(void);
8
9 static void RAMFUNC optimizedSnoop(void)
10 {
11 int n = BigBuf_max_traceLen() / sizeof(uint16_t); // take all memory
12
13 uint16_t *dest = (uint16_t *)BigBuf_get_addr();
14 uint16_t *destend = dest + n;
15
16 AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame mode, 16 bits per word
17 // Reading data loop
18 while(dest <= destend)
19 {
20 if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)
21 {
22 *dest = (uint16_t)(AT91C_BASE_SSC->SSC_RHR);
23 dest++;
24 }
25 }
26 //Resetting Frame mode (First set in fpgaloader.c)
27 AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
28 }
29
30 void HfSnoop(int samplesToSkip, int triggersToSkip)
31 {
32 BigBuf_free(); BigBuf_Clear();
33
34 Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
35 int trigger_cnt;
36 LED_D_ON();
37 // Select correct configs
38 FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
39 // Set up the synchronous serial port
40 FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SNOOP);
41 // connect Demodulated Signal to ADC:
42 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
43 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SNOOP);
44 SpinDelay(100);
45
46 AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame Mode For better performance on high speed data transfer.
47
48 trigger_cnt = 0;
49 uint16_t r = 0;
50 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
51 WDT_HIT();
52 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
53 r = (uint16_t)AT91C_BASE_SSC->SSC_RHR;
54 r = MAX(r & 0xff, r >> 8);
55 if (r >= 240) {
56 if (++trigger_cnt > triggersToSkip)
57 break;
58 }
59 }
60 }
61
62 if(!BUTTON_PRESS()) {
63 int waitcount = samplesToSkip; // lets wait 40000 ticks of pck0
64 while(waitcount != 0) {
65 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY))
66 waitcount--;
67 }
68 optimizedSnoop();
69 Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r);
70 }
71
72 DbpString("HF Snoop end");
73 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
74 LED_D_OFF();
75 }
76
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