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Merge pull request #884 from pwpiwi/fix_iclass_snoop
[proxmark3-svn] / armsrc / hfsnoop.c
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fc52fbd4 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
0472d76d 13#include "proxmark3.h"
0472d76d 14#include "BigBuf.h"
15#include "util.h"
fc52fbd4 16#include "apps.h"
61000404 17#include "usb_cdc.h" // for usb_poll_validate_length
fc52fbd4 18#include "fpga.h"
19#include "fpgaloader.h"
0472d76d 20
21static void RAMFUNC optimizedSnoop(void)
22{
0472d76d 23 int n = BigBuf_max_traceLen() / sizeof(uint16_t); // take all memory
031311c7 24
0472d76d 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);
06ed826c 35 dest++;
0472d76d 36 }
37 }
38 //Resetting Frame mode (First set in fpgaloader.c)
031311c7 39 AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
0472d76d 40}
41
42void HfSnoop(int samplesToSkip, int triggersToSkip)
43{
06ed826c
I
44 BigBuf_free(); BigBuf_Clear();
45
46 Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
c87c4521 47 int trigger_cnt;
031311c7 48 LED_D_ON();
0472d76d 49 // Select correct configs
50 FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
51 // Set up the synchronous serial port
6a5d4e17 52 FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SNOOP);
0472d76d 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.
031311c7 59
0472d76d 60 trigger_cnt = 0;
031311c7 61 uint16_t r = 0;
06ed826c 62 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
031311c7 63 WDT_HIT();
0472d76d 64 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
65 r = (uint16_t)AT91C_BASE_SSC->SSC_RHR;
5d0e1901 66 r = MAX(r & 0xff, r >> 8);
06ed826c
I
67 if (r >= 240) {
68 if (++trigger_cnt > triggersToSkip)
5d0e1901 69 break;
031311c7 70 }
0472d76d 71 }
72 }
5d0e1901 73
031311c7 74 if(!BUTTON_PRESS()) {
031311c7 75 int waitcount = samplesToSkip; // lets wait 40000 ticks of pck0
76 while(waitcount != 0) {
06ed826c 77 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY))
031311c7 78 waitcount--;
0472d76d 79 }
031311c7 80 optimizedSnoop();
5d0e1901 81 Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r);
031311c7 82 }
0472d76d 83
031311c7 84 DbpString("HF Snoop end");
0472d76d 85 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
86 LED_D_OFF();
87}
88
fc52fbd4 89void 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}
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