/*! \file jtag430.c
\author Travis Goodspeed <travis at radiantmachines.com>
-
- This is an implementation of the 16-bit MSP430 JTAG protocol
- for the GoodFET project at http://goodfet.sf.net/
-
- See the license file for details of proper use.
+ \brief MSP430 JTAG (16-bit)
*/
#include "platform.h"
//! Read data from address
unsigned int jtag430_readmem(unsigned int adr){
unsigned int toret;
+ jtag430_haltcpu();
CLRTCLK;
jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
//! 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();
}
//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);
//Perform a reset and disable watchdog.
jtag430_por();
+ jtag430_writemem(0x120,0x5a80);//disable watchdog
+
+ jtag430_haltcpu();
}
//! 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:
//Enter JTAG mode.
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;//clue 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(cmddatalong[0],cmddataword[2]);
- cmddataword[0]=jtag430_readmem(cmddatalong[0]);
+ 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[0]!=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_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_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
}