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 unsigned int jtag430x2_writemem(unsigned long adr,
65 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
66 if(jtag_ir_shift8(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){
98 jtag_ir_shift8(IR_CNTRL_SIG_CAPTURE);
99 if(jtag_dr_shift16(0) & 0x0301){
102 jtag_ir_shift8(IR_CNTRL_SIG_16BIT);
104 jtag_dr_shift16(0x0501);//word read
106 jtag_dr_shift16(0x0511);//byte read
108 jtag_ir_shift8(IR_ADDR_16BIT);
109 jtag_dr_shift20(adr); //20
111 jtag_ir_shift8(IR_DATA_TO_ADDR);
114 toret = jtag_dr_shift16(0x0000);
117 // one or more cycle, so CPU is driving correct MAB
121 // Processor is now again in Init State
130 //! Handles classic MSP430 JTAG commands. Forwards others to JTAG.
131 void jtag430x2handle(unsigned char app,
138 do cmddata[0]=jtag430x2_start();
139 while(cmddata[0]==00 || cmddata[0]==0xFF);
142 if(jtagid==MSP430JTAGID){
143 jtag430mode=MSP430MODE;
145 }else if(jtagid==MSP430X2JTAGID){
146 jtag430mode=MSP430X2MODE;
153 //TAP setup, fuse check
154 //jtag430_resettap();
157 case JTAG430_READMEM:
159 //cmddataword[0]=jtag430x2_readmem(cmddataword[0]);
160 cmddataword[0]=jtag430x2_readmem(cmddatalong[0]);
163 case JTAG430_COREIP_ID:
164 cmddataword[0]=jtag430_coreid();
167 case JTAG430_DEVICE_ID:
168 cmddatalong[0]=jtag430_deviceid();
171 case JTAG430_HALTCPU:
172 case JTAG430_RELEASECPU:
173 case JTAG430_SETINSTRFETCH:
174 case JTAG430_WRITEMEM:
176 jtag430x2_writemem(cmddataword[0],
178 cmddataword[0]=jtag430x2_readmem(cmddataword[0]);
181 case JTAG430_WRITEFLASH:
182 case JTAG430_ERASEFLASH:
185 jtaghandle(app,verb,len);