git.rot13.org Git - goodfet/blob - firmware/apps/jtag/jtag430x2.c

   1 /*! \file jtag430x2.c
   2   \author Travis Goodspeed <travis at radiantmachines.com>
   3
   4   This is an implementation of the MSP430X2 JTAG protocol
   5   for the GoodFET project at http://goodfet.sf.net/
   6
   7   See the license file for details of proper use.
   8 */
   9
  10 #include "platform.h"
  11 #include "command.h"
  12 #include "jtag.h"
  13
  14 unsigned char jtagid;
  15
  16 //! Get the JTAG ID
  17 unsigned char jtag430x2_jtagid(){
  18   jtag430_resettap();
  19   return jtagid=jtag_ir_shift8(IR_BYPASS);
  20 }
  21 //! Start JTAG, take pins
  22 unsigned char jtag430x2_start(){
  23   jtagsetup();
  24
  25   //Known-good starting position.
  26   //Might be unnecessary.
  27   SETTST;
  28   SETRST;
  29
  30   delay(0xFFFF);
  31
  32   //Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
  33   CLRRST;
  34   delay(10);
  35   CLRTST;
  36
  37   delay(5);
  38   SETTST;
  39   msdelay(5);
  40   SETRST;
  41   P5DIR&=~RST;
  42
  43   delay(0xFFFF);
  44
  45   //Perform a reset and disable watchdog.
  46   return jtag430x2_jtagid();
  47 }
  48
  49 //! Grab the core ID.
  50 unsigned int jtag430_coreid(){
  51   jtag_ir_shift8(IR_COREIP_ID);
  52   return jtag_dr_shift16(0);
  53 }
  54
  55 //! Grab the device ID.
  56 unsigned long jtag430_deviceid(){
  57   jtag_ir_shift8(IR_DEVICE_ID);
  58   return jtag_dr_shift20(0);
  59 }
  60
  61
  62 //! Write data to address
  63 void jtag430x2_writemem(unsigned long adr,
  64                         unsigned int data){
  65   jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
  66   if(jtag_dr_shift16(0) & 0x0301){
  67     CLRTCLK;
  68     jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
  69     if(adr>=0x100)
  70       jtag_dr_shift16(0x0500);//word mode
  71     else
  72       jtag_dr_shift16(0x0510);//byte mode
  73     jtag_ir_shift8(IR_ADDR_16BIT);
  74     jtag_dr_shift20(adr);
  75
  76     SETTCLK;
  77
  78     jtag_ir_shift8(IR_DATA_TO_ADDR);
  79     jtag_dr_shift16(data);//16 word
  80
  81     CLRTCLK;
  82     jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
  83     jtag_dr_shift16(0x0501);
  84     SETTCLK;
  85
  86     CLRTCLK;
  87     SETTCLK;
  88     //init state
  89   }else{
  90     while(1) P1OUT^=1; //loop if locked up
  91   }
  92 }
  93
  94 //! Read data from address
  95 unsigned int jtag430x2_readmem(unsigned long adr){
  96   unsigned int toret=0;
  97
  98   do{
  99     jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
 100   }while(!(jtag_dr_shift16(0) & 0x0301));
 101
 102   if(jtag_dr_shift16(0) & 0x0301){
 103     // Read Memory
 104     CLRTCLK;
 105     jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
 106     if(adr>=0x100){
 107       jtag_dr_shift16(0x0501);//word read
 108     }else{
 109       jtag_dr_shift16(0x0511);//byte read
 110     }
 111
 112     jtag_ir_shift8(IR_ADDR_16BIT);
 113     jtag_dr_shift20(adr); //20
 114
 115     jtag_ir_shift8(IR_DATA_TO_ADDR);
 116     SETTCLK;
 117     CLRTCLK;
 118     toret = jtag_dr_shift16(0x0000);
 119
 120     SETTCLK;
 121
 122     //Cycle a bit.
 123     CLRTCLK;
 124     SETTCLK;
 125   }else{
 126     return 0xBABE;
 127   }
 128
 129   return toret;
 130 }
 131
 132 //! Syncs a POR.
 133 unsigned int jtag430x2_syncpor(){
 134   jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
 135   jtag_dr_shift16(0x1501); //JTAG mode
 136   while(!(jtag_dr_shift16(0) & 0x200));
 137   return jtag430x2_por();
 138 }
 139
 140 //! Executes an MSP430X2 POR
 141 unsigned int jtag430x2_por(){
 142   unsigned int i = 0;
 143
 144   // tick
 145   CLRTCLK;
 146   SETTCLK;
 147
 148   jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
 149   jtag_dr_shift16(0x0C01);
 150   jtag_dr_shift16(0x0401);
 151
 152   //cycle
 153   for (i = 0; i < 10; i++){
 154     CLRTCLK;
 155     SETTCLK;
 156   }
 157
 158   jtag_dr_shift16(0x0501);
 159
 160   // tick
 161   CLRTCLK;
 162   SETTCLK;
 163
 164
 165   // Disable WDT
 166   jtag430x2_writemem(0x015C, 0x5A80);
 167
 168   // check state
 169   jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
 170   if(jtag_dr_shift16(0) & 0x0301)
 171     return(1);//ok
 172
 173   return 0;//error
 174 }
 175
 176
 177 //! Check the fuse.
 178 unsigned int jtag430x2_fusecheck(){
 179   int i;
 180   for(i=0;i<3;i++){
 181     jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
 182     if(jtag_dr_shift16(0xAAAA)==0x5555)
 183       return 1;//blown
 184   }
 185   return 0;//unblown
 186 }
 187
 188
 189 //! Handles MSP430X2 JTAG commands.  Forwards others to JTAG.
 190 void jtag430x2handle(unsigned char app,
 191                      unsigned char verb,
 192                      unsigned char len){
 193   register char blocks;
 194
 195   unsigned int i,val;
 196   unsigned long at;
 197
 198   //jtag430_resettap();
 199
 200   switch(verb){
 201   case START:
 202     //Enter JTAG mode.
 203     do cmddata[0]=jtag430x2_start();
 204     while(cmddata[0]==00 || cmddata[0]==0xFF);
 205
 206     //MSP430 or MSP430X
 207     if(jtagid==MSP430JTAGID){
 208       jtag430mode=MSP430MODE;
 209       drwidth=16;
 210     }else if(jtagid==MSP430X2JTAGID){
 211       jtag430mode=MSP430X2MODE;
 212       drwidth=20;
 213     }else{
 214       txdata(app,NOK,1);
 215       return;
 216     }
 217
 218     jtag430x2_fusecheck();
 219
 220     jtag430x2_syncpor();
 221
 222     jtag430_resettap();
 223
 224     txdata(app,verb,1);
 225     break;
 226   case JTAG430_READMEM:
 227   case PEEK:
 228     blocks=(len>4?cmddata[4]:1);
 229     at=cmddatalong[0];
 230
 231     /*
 232     cmddataword[0]=jtag430x2_readmem(at);
 233     txdata(app,verb,2);
 234     break;
 235     */
 236
 237     len=0x80;
 238     serial_tx(app);
 239     serial_tx(verb);
 240     serial_tx(len);
 241
 242     while(blocks--){
 243       for(i=0;i<len;i+=2){
 244         jtag430_resettap();
 245         delay(10);
 246
 247         val=jtag430x2_readmem(at);
 248
 249         at+=2;
 250         serial_tx(val&0xFF);
 251         serial_tx((val&0xFF00)>>8);
 252       }
 253     }
 254
 255     break;
 256   case JTAG430_COREIP_ID:
 257     cmddataword[0]=jtag430_coreid();
 258     txdata(app,verb,2);
 259     break;
 260   case JTAG430_DEVICE_ID:
 261     cmddatalong[0]=jtag430_deviceid();
 262     txdata(app,verb,4);
 263     break;
 264   case JTAG430_HALTCPU:
 265     //jtag430x2_haltcpu();
 266     break;
 267   case JTAG430_RELEASECPU:
 268   case JTAG430_SETINSTRFETCH:
 269   case JTAG430_WRITEMEM:
 270   case POKE:
 271     jtag430x2_writemem(cmddatalong[0],
 272                        cmddataword[2]);
 273     cmddataword[0]=jtag430x2_readmem(cmddatalong[0]);
 274     txdata(app,verb,2);
 275     break;
 276   case JTAG430_WRITEFLASH:
 277   case JTAG430_ERASEFLASH:
 278   case JTAG430_SETPC:
 279   default:
 280     jtaghandle(app,verb,len);
 281   }
 282   jtag430_resettap();
 283 }