X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fjtag%2Fjtag430.c;h=7aea264ed001f4ce7594e80f954cd685f21af013;hp=e1c6dc62437cd92e3def074a829c3fcb2e14970c;hb=33c548994df07e43f25464b7d3f24642e9142a99;hpb=32145d206afbd4ee4c08c2c1543297e568667525

diff --git a/firmware/apps/jtag/jtag430.c b/firmware/apps/jtag/jtag430.c
index e1c6dc6..7aea264 100644
--- 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();
@@ -237,6 +245,7 @@ void jtag430_start(){
   SETRST;
   delay(0xFFFF);
 
+
   #ifndef SBWREWRITE
   //Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
   CLRRST;
@@ -257,7 +266,7 @@ void jtag430_start(){
   jtag430_haltcpu();
 }
 
-//! Start normally, not JTAG.
+//! Stop JTAG.
 void jtag430_stop(){
   debugstr("Exiting JTAG.");
   jtagsetup();
@@ -314,7 +323,8 @@ void jtag430handle(unsigned char app,
     P1OUT^=1;
   }
   P1OUT&=~1;
-    
+  
+  
   switch(verb){
   case START:
     //Enter JTAG mode.
@@ -412,7 +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;