misc/jtagmon.c

   1 #include <string.h>
   2 #include <stdio.h>
   3 #include "jtagmon.h"
   4
   5 enum tap_states {
   6         TEST_LOGIC_RESET,
   7         RUN_TEST_IDLE,
   8         SELECT_DR,
   9         CAPTURE_DR,
  10         SHIFT_DR,
  11         EXIT1_DR,
  12         PAUSE_DR,
  13         EXIT2_DR,
  14         UPDATE_DR,
  15         SELECT_IR,
  16         CAPTURE_IR,
  17         SHIFT_IR,
  18         EXIT1_IR,
  19         PAUSE_IR,
  20         EXIT2_IR,
  21         UPDATE_IR
  22 };
  23
  24 void jtagmon(unsigned char tck, unsigned char tms, unsigned char tdi) {
  25         static unsigned char last_tck = 1;
  26         static char tdi_written = 0;
  27         static int state = TEST_LOGIC_RESET;
  28         static char state_text[32] = "Test Logic Reset";
  29         char last_state_text[32];
  30         int last_state = state;
  31
  32         strcpy(last_state_text, state_text);
  33
  34         if (!last_tck && tck) {
  35                 switch(state) {
  36                         case TEST_LOGIC_RESET:
  37                                 if (tms) {
  38                                         state = TEST_LOGIC_RESET;
  39                                 } else {
  40                                         state = RUN_TEST_IDLE;
  41                                 }
  42                                 break;
  43                         case RUN_TEST_IDLE:
  44                                 if (tms) {
  45                                         state = SELECT_DR;
  46                                 } else {
  47                                         state = RUN_TEST_IDLE;
  48                                 }
  49                                 break;
  50                         case SELECT_DR:
  51                                 if (tms) {
  52                                         state = SELECT_IR;
  53                                 } else {
  54                                         state = CAPTURE_DR;
  55                                 }
  56                                 break;
  57                         case CAPTURE_DR:
  58                                 if (tms) {
  59                                         state = EXIT1_DR;
  60                                 } else {
  61                                         state = SHIFT_DR;
  62                                 }
  63                                 break;
  64                         case SHIFT_DR:
  65                                 if (tms) {
  66                                         state = EXIT1_DR;
  67                                 } else {
  68                                         state = SHIFT_DR;
  69                                 }
  70                                 break;
  71                         case EXIT1_DR:
  72                                 if (tms) {
  73                                         state = UPDATE_DR;
  74                                 } else {
  75                                         state = PAUSE_DR;
  76                                 }
  77                                 break;
  78                         case PAUSE_DR:
  79                                 if (tms) {
  80                                         state = EXIT2_DR;
  81                                 } else {
  82                                         state = PAUSE_DR;
  83                                 }
  84                                 break;
  85                         case EXIT2_DR:
  86                                 if (tms) {
  87                                         state = UPDATE_DR;
  88                                 } else {
  89                                         state = SHIFT_DR;
  90                                 }
  91                                 break;
  92                         case UPDATE_DR:
  93                                 if (tms) {
  94                                         state = SELECT_DR;
  95                                 } else {
  96                                         state = RUN_TEST_IDLE;
  97                                 }
  98                                 break;
  99                         case SELECT_IR:
 100                                 if (tms) {
 101                                         state = TEST_LOGIC_RESET;
 102                                 } else {
 103                                         state = CAPTURE_IR;
 104                                 }
 105                                 break;
 106                         case CAPTURE_IR:
 107                                 if (tms) {
 108                                         state = EXIT1_IR;
 109                                 } else {
 110                                         state = SHIFT_IR;
 111                                 }
 112                                 break;
 113                         case SHIFT_IR:
 114                                 if (tms) {
 115                                         state = EXIT1_IR;
 116                                 } else {
 117                                         state = SHIFT_IR;
 118                                 }
 119                                 break;
 120                         case EXIT1_IR:
 121                                 if (tms) {
 122                                         state = UPDATE_IR;
 123                                 } else {
 124                                         state = PAUSE_IR;
 125                                 }
 126                                 break;
 127                         case PAUSE_IR:
 128                                 if (tms) {
 129                                         state = EXIT2_IR;
 130                                 } else {
 131                                         state = PAUSE_IR;
 132                                 }
 133                                 break;
 134                         case EXIT2_IR:
 135                                 if (tms) {
 136                                         state = UPDATE_IR;
 137                                 } else {
 138                                         state = SHIFT_IR;
 139                                 }
 140                                 break;
 141                         case UPDATE_IR:
 142                                 if (tms) {
 143                                         state = SELECT_DR;
 144                                 } else {
 145                                         state = RUN_TEST_IDLE;
 146                                 }
 147                                 break;
 148                 }
 149
 150                 switch(state) {
 151                         case TEST_LOGIC_RESET:
 152                                 strcpy(state_text, "Test Logic Reset");
 153                                 break;
 154                         case RUN_TEST_IDLE:
 155                                 strcpy(state_text, "Run-Test / Idle");
 156                                 break;
 157                         case SELECT_DR:
 158                                 strcpy(state_text, "Select-DR");
 159                                 break;
 160                         case CAPTURE_DR:
 161                                 strcpy(state_text, "Capture-DR");
 162                                 break;
 163                         case SHIFT_DR:
 164                                 strcpy(state_text, "Shift-DR");
 165                                 break;
 166                         case EXIT1_DR:
 167                                 strcpy(state_text, "Exit1-DR");
 168                                 break;
 169                         case PAUSE_DR:
 170                                 strcpy(state_text, "Pause-DR");
 171                                 break;
 172                         case EXIT2_DR:
 173                                 strcpy(state_text, "Exit2-DR");
 174                                 break;
 175                         case UPDATE_DR:
 176                                 strcpy(state_text, "Update-DR");
 177                                 break;
 178                         case SELECT_IR:
 179                                 strcpy(state_text, "Select-IR");
 180                                 break;
 181                         case CAPTURE_IR:
 182                                 strcpy(state_text, "Capture-IR");
 183                                 break;
 184                         case SHIFT_IR:
 185                                 strcpy(state_text, "Shift-IR");
 186                                 break;
 187                         case EXIT1_IR:
 188                                 strcpy(state_text, "Exit1-IR");
 189                                 break;
 190                         case PAUSE_IR:
 191                                 strcpy(state_text, "Pause-IR");
 192                                 break;
 193                         case EXIT2_IR:
 194                                 strcpy(state_text, "Exit2-IR");
 195                                 break;
 196                         case UPDATE_IR:
 197                                 strcpy(state_text, "Update-IR");
 198                                 break;
 199                 }
 200
 201                 if (last_state != state) {
 202                         if (tdi_written)
 203                                 fprintf(stderr,"\n");
 204
 205                         fprintf(stderr,"TAP state transition from %s to %s\n", last_state_text, state_text);
 206                         tdi_written = 0;
 207                 } else {
 208                         fprintf(stderr,"%d",(tdi ? 1 : 0));
 209                         tdi_written = 1;
 210                 }
 211         }
 212
 213         last_tck = tck;
 214 }