FreeCalypso > hg > fc-sim-sniff

annotate sw/sniff-dec/atr.c @ 44:74330513121e

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simtrace3-sniff-dec: initial cosmetic fixes
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 31 Aug 2023 08:55:34 +0000
parents 118a12e9483b
children
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41
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
1 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 * Here we implement ATR decoding.
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Mychaela Falconia <falcon@freecalypso.org>
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3 */
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4
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Mychaela Falconia <falcon@freecalypso.org>
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5 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include "state.h"
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11
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12 extern char linebuf[];
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13 extern int lineno;
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Mychaela Falconia <falcon@freecalypso.org>
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14 extern unsigned rx_byte;
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15 extern int state;
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16
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17 #define MAX_ATR_BYTES 33
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18
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19 #define SUBST_TS 0
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Mychaela Falconia <falcon@freecalypso.org>
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20 #define SUBST_T0 1
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Mychaela Falconia <falcon@freecalypso.org>
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21 #define SUBST_TAn 2
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Mychaela Falconia <falcon@freecalypso.org>
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22 #define SUBST_TBn 3
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23 #define SUBST_TCn 4
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24 #define SUBST_TDn 5
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Mychaela Falconia <falcon@freecalypso.org>
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25 #define SUBST_HIST 6
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Mychaela Falconia <falcon@freecalypso.org>
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26 #define SUBST_TCK 7
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27
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28 static char atr_start_timestamp[18];
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Mychaela Falconia <falcon@freecalypso.org>
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29 static int atr_start_line;
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Mychaela Falconia <falcon@freecalypso.org>
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30 static int substate;
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Mychaela Falconia <falcon@freecalypso.org>
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31 static u_char atr_bytes[MAX_ATR_BYTES];
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32 static unsigned byte_count;
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Mychaela Falconia <falcon@freecalypso.org>
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33 static u_char latch_y, latch_k, have_tck;
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34
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35 void
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36 atr_begin()
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Mychaela Falconia <falcon@freecalypso.org>
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37 {
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38 substate = SUBST_TS;
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Mychaela Falconia <falcon@freecalypso.org>
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39 byte_count = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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40 }
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41
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42 static int
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Mychaela Falconia <falcon@freecalypso.org>
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43 advance_state()
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Mychaela Falconia <falcon@freecalypso.org>
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44 {
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Mychaela Falconia <falcon@freecalypso.org>
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45 if (substate == SUBST_TAn) {
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Mychaela Falconia <falcon@freecalypso.org>
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46 if (latch_y & 0x10)
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Mychaela Falconia <falcon@freecalypso.org>
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47 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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48 substate = SUBST_TBn;
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Mychaela Falconia <falcon@freecalypso.org>
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49 }
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Mychaela Falconia <falcon@freecalypso.org>
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50 if (substate == SUBST_TBn) {
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Mychaela Falconia <falcon@freecalypso.org>
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51 if (latch_y & 0x20)
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Mychaela Falconia <falcon@freecalypso.org>
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52 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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53 substate = SUBST_TCn;
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Mychaela Falconia <falcon@freecalypso.org>
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54 }
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55 if (substate == SUBST_TCn) {
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Mychaela Falconia <falcon@freecalypso.org>
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56 if (latch_y & 0x40)
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Mychaela Falconia <falcon@freecalypso.org>
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57 return 0;
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58 substate = SUBST_TDn;
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59 }
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60 if (substate == SUBST_TDn) {
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61 if (latch_y & 0x80)
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62 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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63 substate = SUBST_HIST;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 }
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65 if (substate == SUBST_HIST) {
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Mychaela Falconia <falcon@freecalypso.org>
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66 if (latch_k)
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67 return 0;
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68 substate = SUBST_TCK;
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69 }
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70 if (substate == SUBST_TCK) {
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71 if (have_tck)
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72 return 0;
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73 return 1;
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74 }
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parents:
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75 fprintf(stderr, "BUG in ATR decoder: bad state in advance_state()\n");
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76 abort();
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77 }
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78
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79 static void
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80 check_tck()
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81 {
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82 unsigned n, xor;
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83
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84 xor = 0;
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85 for (n = 1; n < byte_count; n++)
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86 xor ^= atr_bytes[n];
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parents:
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87 printf(" TCK is %s\n", xor ? "bad!" : "correct");
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88 }
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89
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90 static void
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91 atr_finish()
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92 {
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Mychaela Falconia <falcon@freecalypso.org>
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93 unsigned n;
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94
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95 printf("%s line %d: ATR\n", atr_start_timestamp, atr_start_line);
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parents:
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96 for (n = 0; n < byte_count; n++)
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97 printf(" %02X", atr_bytes[n]);
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98 putchar('\n');
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99 if (have_tck)
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Mychaela Falconia <falcon@freecalypso.org>
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100 check_tck();
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101 state = STATE_READY_FOR_CMD;
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Mychaela Falconia <falcon@freecalypso.org>
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102 }
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parents:
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103
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parents:
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104 void
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105 atr_byte_in()
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106 {
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107 atr_bytes[byte_count++] = rx_byte;
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108 switch (substate) {
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109 case SUBST_TS:
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Mychaela Falconia <falcon@freecalypso.org>
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110 substate = SUBST_T0;
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Mychaela Falconia <falcon@freecalypso.org>
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111 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 case SUBST_T0:
44
74330513121e simtrace3-sniff-dec: initial cosmetic fixes
Mychaela Falconia <falcon@freecalypso.org>
parents: 41
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113 strcpy(atr_start_timestamp, linebuf);
74330513121e simtrace3-sniff-dec: initial cosmetic fixes
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parents: 41
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114 atr_start_line = lineno;
41
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115 latch_y = rx_byte & 0xF0;
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116 latch_k = rx_byte & 0x0F;
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Mychaela Falconia <falcon@freecalypso.org>
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117 have_tck = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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118 substate = SUBST_TAn;
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Mychaela Falconia <falcon@freecalypso.org>
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119 if (advance_state()) {
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Mychaela Falconia <falcon@freecalypso.org>
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120 atr_finish();
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121 return;
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122 }
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Mychaela Falconia <falcon@freecalypso.org>
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123 return;
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Mychaela Falconia <falcon@freecalypso.org>
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124 case SUBST_TAn:
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Mychaela Falconia <falcon@freecalypso.org>
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125 substate = SUBST_TBn;
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126 if (advance_state()) {
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127 atr_finish();
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128 return;
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129 }
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130 break;
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131 case SUBST_TBn:
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132 substate = SUBST_TCn;
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133 if (advance_state()) {
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134 atr_finish();
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135 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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136 }
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Mychaela Falconia <falcon@freecalypso.org>
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137 break;
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Mychaela Falconia <falcon@freecalypso.org>
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138 case SUBST_TCn:
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Mychaela Falconia <falcon@freecalypso.org>
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139 substate = SUBST_TDn;
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Mychaela Falconia <falcon@freecalypso.org>
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140 if (advance_state()) {
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Mychaela Falconia <falcon@freecalypso.org>
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141 atr_finish();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 return;
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parents:
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143 }
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Mychaela Falconia <falcon@freecalypso.org>
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144 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 case SUBST_TDn:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 latch_y = rx_byte & 0xF0;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 if (rx_byte & 0x0F)
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 have_tck = 1;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 substate = SUBST_TAn;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 if (advance_state()) {
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 atr_finish();
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 return;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 }
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 break;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 case SUBST_HIST:
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 latch_k--;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (advance_state()) {
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 atr_finish();
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 return;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 break;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 case SUBST_TCK:
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 atr_finish();
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 return;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 default:
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 fprintf(stderr,
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 "BUG in ATR decoder: bad state in atr_byte_in()\n");
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 abort();
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 }
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 if (byte_count < MAX_ATR_BYTES)
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 return;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 printf("%s line %d: ERROR: ATR is too long\n", atr_start_timestamp,
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 atr_start_line);
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 state = STATE_ERROR;
118a12e9483b simtrace3-sniff-dec started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 }