FreeCalypso > hg > fc-sim-sniff

annotate sw/sniff-dec/dispatch.c @ 56:966a54303d68

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simsniff-dec: factor out high-level decoding
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 04 Oct 2023 01:18:50 +0000
parents b0524d1dc6ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
41
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * Dispatching received FPGA words based on the current state.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 */
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4
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 #include <sys/types.h>
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6 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 #include "state.h"
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Mychaela Falconia <falcon@freecalypso.org>
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9
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10 extern char linebuf[];
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11 extern int lineno;
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12 extern unsigned fpga_word;
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13
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14 extern u_char parity_table[256];
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 extern u_char inverse_coding_table[256];
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Mychaela Falconia <falcon@freecalypso.org>
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16
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17 int state;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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18 int inverse_conv;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 unsigned rx_byte;
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Mychaela Falconia <falcon@freecalypso.org>
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20
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21 #define PREFIX "%s line %d: "
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22
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 static void
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Mychaela Falconia <falcon@freecalypso.org>
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24 handle_rst_change()
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Mychaela Falconia <falcon@freecalypso.org>
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25 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 if (fpga_word & 0x4000) {
44
74330513121e simtrace3-sniff-dec: initial cosmetic fixes
Mychaela Falconia <falcon@freecalypso.org>
parents: 41
diff changeset
27 printf(PREFIX "RST high, card session begins\n",
41
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28 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
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29 state = STATE_ATR_TS;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30 atr_begin();
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31 } else {
44
74330513121e simtrace3-sniff-dec: initial cosmetic fixes
Mychaela Falconia <falcon@freecalypso.org>
parents: 41
diff changeset
32 printf(PREFIX "RST low, card session ends\n", linebuf, lineno);
41
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 state = STATE_RSTLOW;
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34 }
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35 }
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parents:
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36
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37 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 byte_prelim_checks()
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Mychaela Falconia <falcon@freecalypso.org>
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39 {
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Mychaela Falconia <falcon@freecalypso.org>
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40 if (!(fpga_word & 0x4000)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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41 printf(PREFIX "ERROR: char Rx with RST low\n", linebuf, lineno);
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parents:
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42 return 1;
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Mychaela Falconia <falcon@freecalypso.org>
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43 }
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Mychaela Falconia <falcon@freecalypso.org>
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44 if (fpga_word & 0x0200) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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45 printf(PREFIX "ERROR: start bit midpoint sampled high\n",
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Mychaela Falconia <falcon@freecalypso.org>
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46 linebuf, lineno);
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parents:
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47 return 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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48 }
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parents:
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49 if (fpga_word & 0x0400) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 printf(PREFIX "ISO 7816-3 section 7.3 error signal\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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51 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 return 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 }
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Mychaela Falconia <falcon@freecalypso.org>
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54 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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55 }
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parents:
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56
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parents:
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57 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 check_parity()
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 unsigned expect_par;
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parents:
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61
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parents:
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62 expect_par = (parity_table[fpga_word & 0xFF] ^ inverse_conv) << 8;
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parents:
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63 if ((fpga_word & 0x100) != expect_par) {
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parents:
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64 printf(PREFIX "ERROR: bad character parity\n", linebuf, lineno);
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parents:
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65 state = STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 return 1;
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parents:
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67 }
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parents:
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68 return 0;
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parents:
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69 }
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parents:
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70
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71 static void
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72 extract_rx_byte()
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73 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 if (inverse_conv)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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75 rx_byte = inverse_coding_table[fpga_word & 0xFF];
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parents:
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76 else
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parents:
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77 rx_byte = fpga_word & 0xFF;
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parents:
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78 }
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parents:
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79
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parents:
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80 void
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parents:
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81 process_fpga_word()
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parents:
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82 {
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parents:
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83 if (fpga_word & 0x8000) {
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parents:
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84 handle_rst_change();
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parents:
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85 return;
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parents:
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86 }
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parents:
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87 if (state == STATE_ERROR)
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parents:
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88 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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89 if (byte_prelim_checks()) {
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parents:
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90 state = STATE_ERROR;
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parents:
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91 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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92 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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93 switch (state) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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94 case STATE_UNDEF:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 printf(PREFIX "ERROR: char Rx without preceding RST high\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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96 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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97 state = STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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98 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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99 case STATE_RSTLOW:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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100 printf(PREFIX "ERROR: char Rx after RST low\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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101 linebuf, lineno);
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parents:
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102 state = STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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103 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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104 case STATE_ATR_TS:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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105 if ((fpga_word & 0x1FF) == 0x13B) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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106 printf(PREFIX "TS sets direct coding convention\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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107 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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108 inverse_conv = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 rx_byte = 0x3B;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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110 atr_byte_in();
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parents:
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111 state = STATE_ATR_CONT;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 } else if ((fpga_word & 0x1FF) == 0x103) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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113 printf(PREFIX "TS sets inverse coding convention\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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114 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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115 inverse_conv = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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116 rx_byte = 0x3F;
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parents:
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117 atr_byte_in();
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parents:
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118 state = STATE_ATR_CONT;
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parents:
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119 } else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 printf(PREFIX "ERROR: invalid char after RST high\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 linebuf, lineno);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 state = STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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125 case STATE_ATR_CONT:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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126 if (check_parity())
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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129 atr_byte_in();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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130 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 case STATE_READY_FOR_CMD:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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132 if (check_parity())
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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133 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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134 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 if (rx_byte == 0xFF)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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136 start_pps_msg();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 else
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 start_cmd_header();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 case STATE_PPS_MSG:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 if (check_parity())
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 pps_byte_in();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 return;
45
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parents: 44
diff changeset
146 case STATE_CMD_HDR:
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diff changeset
147 if (check_parity())
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diff changeset
148 return;
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parents: 44
diff changeset
149 extract_rx_byte();
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diff changeset
150 cmd_hdr_byte_in();
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151 return;
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diff changeset
152 case STATE_CMD_PROC:
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diff changeset
153 if (check_parity())
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parents: 44
diff changeset
154 return;
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parents: 44
diff changeset
155 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
156 cmd_proc_byte_in();
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parents: 44
diff changeset
157 return;
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parents: 44
diff changeset
158 case STATE_CMD_DATA:
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
159 if (check_parity())
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
160 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
161 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
162 cmd_data_byte_in();
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
163 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
164 case STATE_CMD_SW:
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
165 if (check_parity())
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
166 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
167 extract_rx_byte();
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
168 cmd_sw2_byte_in();
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Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
169 return;
41
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 default:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 fprintf(stderr, "BUG in top state machine: invalid state\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 abort();
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 }
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 }