WEAKDEFed ejtaghandle.

[goodfet] / firmware / apps / jtag / jtag430.c

diff --git a/firmware/apps/jtag/jtag430.c b/firmware/apps/jtag/jtag430.c
index d0b83cb..7aea264 100644 (file)
--- a/firmware/apps/jtag/jtag430.c
+++ b/firmware/apps/jtag/jtag430.c
@@ -10,23 +10,31 @@
 
 unsigned int jtag430mode=MSP430X2MODE;
 
-//! Set the program counter.
-void jtag430_setpc(unsigned int adr){
+//! Set a register.
+void jtag430_setr(u8 reg, u16 val){
   jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
   jtag_dr_shift16(0x3401);// release low byte
   jtag_ir_shift8(IR_DATA_16BIT);
-  jtag_dr_shift16(0x4030);//Instruction to load PC
+  
+  //0x4030 is "MOV #foo, r0"
+  //Right-most field is register, so 0x4035 loads r5
+  jtag_dr_shift16(0x4030+reg);
   CLRTCLK;
   SETTCLK;
-  jtag_dr_shift16(adr);// Value for PC
+  jtag_dr_shift16(val);// Value for the register
   CLRTCLK;
   jtag_ir_shift8(IR_ADDR_CAPTURE);
   SETTCLK;
-  CLRTCLK ;// Now PC is set to "PC_Value"
+  CLRTCLK ;// Now reg is set to new value.
   jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
   jtag_dr_shift16(0x2401);// low byte controlled by JTAG
 }
 
+//! Set the program counter.
+void jtag430_setpc(unsigned int adr){
+  jtag430_setr(0,adr);
+}
+
 //! Halt the CPU
 void jtag430_haltcpu(){
   //jtag430_setinstrfetch();
@@ -199,19 +207,17 @@ void jtag430_resettap(){
   SETTDI; //430X2
   SETTMS;
   //SETTDI; //classic
-  SETTCK;
+  TCKTOCK;
 
   // Navigate to reset state.
   // Should be at least six.
   for(i=0;i<4;i++){
-    CLRTCK;
-    SETTCK;
+    TCKTOCK;
   }
 
   // test-logic-reset
-  CLRTCK;
   CLRTMS;
-  SETTCK;
+  TCKTOCK;
   SETTMS;
   // idle
 
@@ -238,7 +244,9 @@ void jtag430_start(){
   SETTST;
   SETRST;
   delay(0xFFFF);
-  
+
+
+  #ifndef SBWREWRITE
   //Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
   CLRRST;
   delay(100); //100
@@ -249,6 +257,7 @@ void jtag430_start(){
   SETRST;
   P5DIR&=~RST;
   delay(0xFFFF);
+  #endif
   
   //Perform a reset and disable watchdog.
   jtag430_por();
@@ -257,6 +266,27 @@ void jtag430_start(){
   jtag430_haltcpu();
 }
 
+//! Stop JTAG.
+void jtag430_stop(){
+  debugstr("Exiting JTAG.");
+  jtagsetup();
+  
+  //Known-good starting position.
+  //Might be unnecessary.
+  //SETTST;
+  CLRTST;
+  SETRST;
+  delay(0xFFFF);
+  
+  //Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
+  CLRRST;
+  delay(0xFFFF);
+  SETRST;
+  //P5DIR&=~RST;
+  //delay(0xFFFF);
+  
+}
+
 //! Set CPU to Instruction Fetch
 void jtag430_setinstrfetch(){
   
@@ -276,12 +306,25 @@ void jtag430_setinstrfetch(){
 void jtag430handle(unsigned char app,
                   unsigned char verb,
                   unsigned long len){
-  register char blocks;
   unsigned long at;
   unsigned int i, val;
   
   //debugstr("Classic MSP430 handler.");
   
+  
+  /* FIXME
+   * Sometimes JTAG doesn't init correctly.
+   * This restarts the connection if the masked-rom
+   * chip ID cannot be read.  Should print warning
+   * for testing server.
+   */
+  while((i=jtag430_readmem(0xff0))==0xFFFF){
+    jtag430_start();
+    P1OUT^=1;
+  }
+  P1OUT&=~1;
+  
+  
   switch(verb){
   case START:
     //Enter JTAG mode.
@@ -289,6 +332,12 @@ void jtag430handle(unsigned char app,
     //TAP setup, fuse check
     jtag430_resettap();
     
+    cmddata[0]=jtag_ir_shift8(IR_BYPASS);    
+    txdata(app,verb,1);
+
+    break;
+  case STOP:
+    jtag430_stop();
     txdata(app,verb,0);
     break;
   case JTAG430_HALTCPU:
@@ -314,7 +363,7 @@ void jtag430handle(unsigned char app,
       len=(cmddataword[2]);//always even.
     else
       len=2;
-    len&=~1;//clue lsbit
+    len&=~1;//clear lsbit
     
     txhead(app,verb,len);
     for(i=0;i<len;i+=2){
@@ -333,17 +382,35 @@ void jtag430handle(unsigned char app,
     cmddataword[0]=jtag430_readmem(cmddataword[0]);
     txdata(app,verb,2);
     break;
+    /*
   case JTAG430_WRITEFLASH:
+
     //debugstr("Poking flash memory.");
     jtag430_writeflash(cmddataword[0],cmddataword[2]);
     
     //Try again if failure.
-    if(cmddataword[0]!=jtag430_readmem(cmddataword[0]))
-      jtag430_writeflash(cmddataword[0],cmddataword[2]);
+    //if(cmddataword[2]!=jtag430_readmem(cmddataword[0]))
+    //  jtag430_writeflash(cmddataword[0],cmddataword[2]);
     
     //Return result.
     cmddataword[0]=jtag430_readmem(cmddataword[0]);
     
+    txdata(app,verb,2);
+    break; */
+  case JTAG430_WRITEFLASH:
+    at=cmddataword[0];
+    
+    for(i=0;i<(len>>1)-2;i++){
+      //debugstr("Poking flash memory.");
+      jtag430_writeflash(at+(i<<1),cmddataword[i+2]);
+      //Reflash if needed.  Try this twice to save grace?
+      if(cmddataword[i]!=jtag430_readmem(at))
+       jtag430_writeflash(at+(i<<1),cmddataword[i+2]);
+    }
+    
+    //Return result of first write as a word.
+    cmddataword[0]=jtag430_readmem(cmddataword[0]);
+    
     txdata(app,verb,2);
     break;
   case JTAG430_ERASEFLASH:
@@ -355,7 +422,16 @@ void jtag430handle(unsigned char app,
     jtag430_setpc(cmddataword[0]);
     txdata(app,verb,0);
     break;
-    
+  case JTAG430_SETREG:
+    jtag430_setr(cmddata[0],cmddataword[1]);
+    txdata(app,verb,0);
+    break;
+  case JTAG430_GETREG:
+    //jtag430_getr(cmddata[0]);
+    debugstr("JTAG430_GETREG not yet implemented.");
+    cmddataword[0]=0xDEAD;
+    txdata(app,verb,2);
+    break;
   case JTAG430_COREIP_ID:
   case JTAG430_DEVICE_ID:
     cmddataword[0]=0;