2 \author Travis Goodspeed <travis at radiantmachines.com>
4 This is an implementation of the MSP430X2 JTAG protocol
5 for the GoodFET project at http://goodfet.sf.net/
7 See the license file for details of proper use.
17 unsigned char jtag430x2_jtagid(){
19 return jtagid=jtag_ir_shift8(IR_BYPASS);
21 //! Start JTAG, take pins
22 unsigned char jtag430x2_start(){
25 //Known-good starting position.
26 //Might be unnecessary.
32 //Entry sequence from Page 67 of SLAU265A for 4-wire MSP430 JTAG
45 //Perform a reset and disable watchdog.
46 return jtag430x2_jtagid();
50 unsigned int jtag430_coreid(){
51 jtag_ir_shift8(IR_COREIP_ID);
52 return jtag_dr_shift16(0);
55 //! Grab the device ID.
56 unsigned long jtag430_deviceid(){
57 jtag_ir_shift8(IR_DEVICE_ID);
58 return jtag_dr_shift20(0);
62 //! Write data to address
63 void jtag430x2_writemem(unsigned long adr,
65 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
66 if(jtag_dr_shift16(0) & 0x0301){
68 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
70 jtag_dr_shift16(0x0500);//word mode
72 jtag_dr_shift16(0x0510);//byte mode
73 jtag_ir_shift8(IR_ADDR_16BIT);
78 jtag_ir_shift8(IR_DATA_TO_ADDR);
79 jtag_dr_shift16(data);//16 word
82 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
83 jtag_dr_shift16(0x0501);
90 while(1) P1OUT^=1; //loop if locked up
94 //! Read data from address
95 unsigned int jtag430x2_readmem(unsigned long adr){
101 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
102 }while(!(jtag_dr_shift16(0) & 0x0301));
104 if(jtag_dr_shift16(0) & 0x0301){
107 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
109 jtag_dr_shift16(0x0501);//word read
111 jtag_dr_shift16(0x0511);//byte read
114 jtag_ir_shift8(IR_ADDR_16BIT);
115 jtag_dr_shift20(adr); //20
117 jtag_ir_shift8(IR_DATA_TO_ADDR);
120 toret = jtag_dr_shift16(0x0000);
134 unsigned int jtag430x2_syncpor(){
135 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
136 jtag_dr_shift16(0x1501); //JTAG mode
137 while(!(jtag_dr_shift16(0) & 0x200));
138 return jtag430x2_por();
141 //! Executes an MSP430X2 POR
142 unsigned int jtag430x2_por(){
149 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
150 jtag_dr_shift16(0x0C01);
151 jtag_dr_shift16(0x0401);
154 for (i = 0; i < 10; i++){
159 jtag_dr_shift16(0x0501);
167 jtag430x2_writemem(0x015C, 0x5A80);
170 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
171 if(jtag_dr_shift16(0) & 0x0301)
179 unsigned int jtag430x2_fusecheck(){
182 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
183 if(jtag_dr_shift16(0xAAAA)==0x5555)
190 //! Handles MSP430X2 JTAG commands. Forwards others to JTAG.
191 void jtag430x2handle(unsigned char app,
194 register char blocks;
199 //jtag430_resettap();
205 cmddata[0]=jtag430x2_start();
206 //while(cmddata[0]==00 || cmddata[0]==0xFF);
209 if(jtagid==MSP430JTAGID){
210 jtag430mode=MSP430MODE;
212 }else if(jtagid==MSP430X2JTAGID){
213 jtag430mode=MSP430X2MODE;
220 jtag430x2_fusecheck();
228 case JTAG430_READMEM:
230 blocks=(len>4?cmddata[4]:1);
234 cmddataword[0]=jtag430x2_readmem(at);
249 val=jtag430x2_readmem(at);
253 serial_tx((val&0xFF00)>>8);
258 case JTAG430_COREIP_ID:
259 cmddataword[0]=jtag430_coreid();
262 case JTAG430_DEVICE_ID:
263 cmddatalong[0]=jtag430_deviceid();
267 case JTAG430_WRITEMEM:
269 jtag430x2_writemem(cmddatalong[0],
271 cmddataword[0]=jtag430x2_readmem(cmddatalong[0]);
275 //unimplemented functions
276 case JTAG430_HALTCPU:
277 case JTAG430_RELEASECPU:
278 case JTAG430_SETINSTRFETCH:
279 case JTAG430_WRITEFLASH:
280 case JTAG430_ERASEFLASH:
285 jtaghandle(app,verb,len);