+/*! \file jtag430.c
+ \author Travis Goodspeed <travis at radiantmachines.com>
+ \brief MSP430 JTAG (16-bit)
+*/
#include "platform.h"
#include "command.h"
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();
//! Read data from address
unsigned int jtag430_readmem(unsigned int adr){
unsigned int toret;
+ jtag430_haltcpu();
CLRTCLK;
jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
+
if(adr>0xFF)
jtag_dr_shift16(0x2409);//word read
else
SETTCLK;
}
-
//! Write data to flash memory. Must be preconfigured.
void jtag430_writeflashword(unsigned int adr, unsigned int data){
- /*
+
CLRTCLK;
jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
jtag_dr_shift16(0x2408);//word write
CLRTCLK;
jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
jtag_dr_shift16(0x2409);
- */
+ /*
jtag430_writemem(adr,data);
CLRTCLK;
jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
jtag_dr_shift16(0x2409);
+ */
//Pulse TCLK
jtag430_tclk_flashpulses(35); //35 standard
-
}
//! Configure flash, then write a word.
//FCTL2=0xA540, selecting MCLK as source, DIV=1
jtag430_writemem(0x012A, 0xA540);
//FCTL3=0xA500, should be 0xA540 for Info Seg A on 2xx chips.
- jtag430_writemem(0x012C, 0xA500);
+ jtag430_writemem(0x012C, 0xA500); //all but info flash.
//Write the word itself.
jtag430_writeflashword(adr,data);
//FCTL1=0xA500, disabling flash write
jtag430_writemem(0x0128, 0xA500);
- jtag430_releasecpu();
+ //jtag430_releasecpu();
}
//FCTL1=0xA500, disabling flash write
jtag430_writemem(0x0128, 0xA500);
- jtag430_releasecpu();
+ //jtag430_releasecpu();
}
void jtag430_resettap(){
int i;
// Settle output
+ SETTDI; //430X2
SETTMS;
- SETTDI;
- SETTCK;
+ //SETTDI; //classic
+ 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
/* sacred, by spec.
- Sometimes this isn't necessary. */
+ Sometimes this isn't necessary. */
// fuse check
CLRTMS;
delay(50);
SETTST;
SETRST;
delay(0xFFFF);
-
+
+
+ #ifndef SBWREWRITE
//Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
CLRRST;
- delay(100);
+ delay(100); //100
CLRTST;
- delay(50);
+ delay(50); //50
SETTST;
- delay(50);
+ delay(50); //50
SETRST;
P5DIR&=~RST;
delay(0xFFFF);
+ #endif
//Perform a reset and disable watchdog.
jtag430_por();
+ jtag430_writemem(0x120,0x5a80);//disable watchdog
+
+ 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(){
+
jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
// Wait until instruction fetch state.
//! Handles classic MSP430 JTAG commands. Forwards others to JTAG.
-void oldjtag430handle(unsigned char app,
+void jtag430handle(unsigned char app,
unsigned char verb,
- unsigned char len){
+ unsigned long len){
+ 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:
jtag430_start();
//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:
jtag430_setinstrfetch();
txdata(app,verb,0);
break;
-
case JTAG430_READMEM:
case PEEK:
- cmddataword[0]=jtag430_readmem(cmddataword[0]);
- txdata(app,verb,2);
+ at=cmddatalong[0];
+
+ //Fetch large blocks for bulk fetches,
+ //small blocks for individual peeks.
+ if(len>5)
+ len=(cmddataword[2]);//always even.
+ else
+ len=2;
+ len&=~1;//clear lsbit
+
+ txhead(app,verb,len);
+ for(i=0;i<len;i+=2){
+ jtag430_resettap();
+ val=jtag430_readmem(at);
+
+ at+=2;
+ serial_tx(val&0xFF);
+ serial_tx((val&0xFF00)>>8);
+ }
break;
case JTAG430_WRITEMEM:
case POKE:
- jtag430_writemem(cmddataword[0],cmddataword[1]);
+ jtag430_haltcpu();
+ jtag430_writemem(cmddataword[0],cmddataword[2]);
cmddataword[0]=jtag430_readmem(cmddataword[0]);
txdata(app,verb,2);
break;
+ /*
case JTAG430_WRITEFLASH:
- jtag430_writeflash(cmddataword[0],cmddataword[1]);
+
+ //debugstr("Poking flash memory.");
+ jtag430_writeflash(cmddataword[0],cmddataword[2]);
+
+ //Try again if failure.
+ //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:
- jtag430_eraseflash(ERASE_MASS,0xFFFE,0xFFFF);
- jtag430_eraseflash(ERASE_MASS,0xFFFE,0xFFFF);
- jtag430_eraseflash(ERASE_MASS,0xFFFE,0xFFFF);
+ jtag430_eraseflash(ERASE_MASS,0xFFFE,0x3000);
txdata(app,verb,0);
break;
case JTAG430_SETPC:
+ jtag430_haltcpu();
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;
+ cmddataword[1]=0;
+ txdata(app,verb,4);
+ break;
+
default:
jtaghandle(app,verb,len);
}
- jtag430_resettap();
-}
-
-//! Handles unique MSP430 JTAG commands. Forwards others to JTAG.
-void jtag430handle(unsigned char app,
- unsigned char verb,
- unsigned char len){
- switch(jtag430mode){
- case MSP430MODE:
- return oldjtag430handle(app,verb,len);
- case MSP430X2MODE:
- return jtag430x2handle(app,verb,len);
- default:
- txdata(app,NOK,0);
- }
+ //jtag430_resettap(); //DO NOT UNCOMMENT
}
projects / goodfet / blobdiff