2 \author Travis Goodspeed
3 \brief Chipcon 8051 debugging.
7 //This is like SPI, except that you read or write, not both.
9 /* N.B. The READ verb performs a write of all (any) supplied data,
10 then reads a single byte reply from the target. The WRITE verb
23 /* Concerning clock rates,
24 the maximimum clock rates are defined on page 4 of the spec.
25 They vary, but are roughly 30MHz. Raising this clock rate might
26 allow for clock glitching, but the GoodFET isn't sufficient fast for that.
27 Perhaps a 200MHz ARM or an FPGA in the BadassFET?
31 //MISO and MOSI are the same pin, direction changes.
37 //This could be more accurate.
38 //Does it ever need to be?
40 #define CCDELAY(x) delay(x)
42 #define SETMOSI P5OUT|=MOSI
43 #define CLRMOSI P5OUT&=~MOSI
44 #define SETCLK P5OUT|=SCK
45 #define CLRCLK P5OUT&=~SCK
46 #define READMISO (P5IN&MISO?1:0)
48 #define CCWRITE P5DIR|=MOSI
49 #define CCREAD P5DIR&=~MISO
51 //! Set up the pins for CC mode. Does not init debugger.
55 //P5DIR&=~MISO; //MOSI is MISO
58 //! Initialize the debugger
60 //Two positive debug clock pulses while !RST is low.
61 //Take RST low, pulse twice, then high.
79 //! Read and write a CC bit.
80 unsigned char cctrans8(unsigned char byte){
82 //This function came from the SPI Wikipedia article.
85 for (bit = 0; bit < 8; bit++) {
86 /* write MOSI on trailing edge of previous clock */
93 /* half a clock cycle before leading/rising edge */
97 /* half a clock cycle before trailing/falling edge */
100 /* read MISO on trailing edge */
108 //! Send a command from txbytes.
109 void cccmd(unsigned char len){
113 cctrans8(cmddata[i]);
116 //! Fetch a reply, usually 1 byte.
117 void ccread(unsigned char len){
121 cmddata[i]=cctrans8(0);
124 //! Handles a monitor command.
125 void cchandle(unsigned char app,
128 //Always init. Might help with buggy lines.
132 //CC_PEEK and CC_POKE will come later.
133 case READ: //Write a command and return 1-byte reply.
138 case WRITE: //Write a command with no reply.
142 case START://enter debugger
146 case STOP://exit debugger
147 //Take RST low, then high.
164 cc_wr_config(cmddata[0]);
179 case CC_SET_HW_BRKPNT:
180 cc_set_hw_brkpnt(cmddataword[0]);
199 case CC_STEP_REPLACE:
200 txdata(app,NOK,0);//TODO add me
209 case CC_READ_CODE_MEMORY:
210 cmddata[0]=cc_peekcodebyte(cmddataword[0]);
213 case CC_READ_XDATA_MEMORY:
214 cmddata[0]=cc_peekdatabyte(cmddataword[0]);
217 case CC_WRITE_XDATA_MEMORY:
218 cmddata[0]=cc_pokedatabyte(cmddataword[0], cmddata[2]);
222 cc_set_pc(cmddatalong[0]);
225 case CC_WRITE_FLASH_PAGE:
226 cc_write_flash_page(cmddatalong[0]);
229 case CC_MASS_ERASE_FLASH:
231 case CC_PROGRAM_FLASH:
232 debugstr("This Chipcon command is not yet implemented.");
233 txdata(app,NOK,0);//TODO implement me.
238 //! Set the Chipcon's Program Counter
239 void cc_set_pc(u32 adr){
240 cmddata[0]=0x02; //GetPC
241 cmddata[1]=(adr>>8)&0xff; //HIBYTE
242 cmddata[2]=adr&0xff; //LOBYTE
246 //! Erase all of a Chipcon's memory.
247 void cc_chip_erase(){
248 cmddata[0]=CCCMD_CHIP_ERASE; //0x14
252 //! Write the configuration byte.
253 void cc_wr_config(unsigned char config){
254 cmddata[0]=CCCMD_WR_CONFIG; //0x1D
259 //! Read the configuration byte.
260 unsigned char cc_rd_config(){
261 cmddata[0]=CCCMD_RD_CONFIG; //0x24
268 //! Read the status register
269 unsigned char cc_read_status(){
270 cmddata[0]=CCCMD_READ_STATUS; //0x3f
276 //! Read the CHIP ID bytes.
277 unsigned short cc_get_chip_id(){
278 unsigned short toret;
279 cmddata[0]=CCCMD_GET_CHIP_ID; //0x68
285 toret=(toret<<8)+cmddata[1];
289 //! Populates flash buffer in xdata.
290 void cc_write_flash_buffer(u8 *data, u16 len){
291 cc_write_xdata(0xf000, data, len);
293 //! Populates flash buffer in xdata.
294 void cc_write_xdata(u16 adr, u8 *data, u16 len){
296 for(i=0; i<len; i++){
297 cc_pokedatabyte(adr+i,
303 //32-bit words, 2KB pages
304 #define HIBYTE_WORDS_PER_FLASH_PAGE 0x02
305 #define LOBYTE_WORDS_PER_FLASH_PAGE 0x00
306 #define FLASHPAGE_SIZE 0x800
309 #define FLASH_WORD_SIZE 0x4
311 const u8 flash_routine[] = {
314 0x00,//#imm=((address >> 8) / FLASH_WORD_SIZE) & 0x7E,
316 0x75, 0xAC, 0x00, // MOV FADDRL, #00;
318 0x75, 0xAE, 0x01, // MOV FLC, #01H; // ERASE
319 // ; Wait for flash erase to complete
320 0xE5, 0xAE, // eraseWaitLoop: MOV A, FLC;
321 0x20, 0xE7, 0xFB, // JB ACC_BUSY, eraseWaitLoop;
323 // ; Initialize the data pointer
324 0x90, 0xF0, 0x00, // MOV DPTR, #0F000H;
326 0x7F, HIBYTE_WORDS_PER_FLASH_PAGE, // MOV R7, #imm;
327 0x7E, LOBYTE_WORDS_PER_FLASH_PAGE, // MOV R6, #imm;
328 0x75, 0xAE, 0x02, // MOV FLC, #02H; // WRITE
330 0x7D, FLASH_WORD_SIZE, // writeLoop: MOV R5, #imm;
331 0xE0, // writeWordLoop: MOVX A, @DPTR;
333 0xF5, 0xAF, // MOV FWDATA, A;
334 0xDD, 0xFA, // DJNZ R5, writeWordLoop;
335 // ; Wait for completion
336 0xE5, 0xAE, // writeWaitLoop: MOV A, FLC;
337 0x20, 0xE6, 0xFB, // JB ACC_SWBSY, writeWaitLoop;
338 0xDE, 0xF1, // DJNZ R6, writeLoop;
339 0xDF, 0xEF, // DJNZ R7, writeLoop;
340 // ; Done, fake a breakpoint
344 //! Copies flash buffer to flash.
345 void cc_write_flash_page(u32 adr){
346 //Assumes that page has already been written to XDATA 0xF000
349 //WRITE_XDATA_MEMORY(IN: 0xF000 + FLASH_PAGE_SIZE, sizeof(routine), routine);
350 cc_write_xdata(0xF000+FLASHPAGE_SIZE,
351 (u8*) flash_routine, sizeof(flash_routine));
352 //Patch routine's third byte with
353 //((address >> 8) / FLASH_WORD_SIZE) & 0x7E
354 cc_pokedatabyte(0xF000+FLASHPAGE_SIZE+2,
355 ((adr>>8)/FLASH_WORD_SIZE)&0x7E);
356 cc_debug(3, //MOV MEMCTR, (bank * 16) + 1;
358 cc_set_pc(0xf000+FLASHPAGE_SIZE);//execute code fragment
360 while(!(cc_read_status()&CC_STATUS_CPUHALTED)){
364 P1OUT&=~1;//clear LED
368 unsigned short cc_get_pc(){
369 cmddata[0]=CCCMD_GET_PC; //0x28
374 return cmddataword[0];
377 //! Set a hardware breakpoint.
378 void cc_set_hw_brkpnt(unsigned short adr){
379 debugstr("FIXME: This certainly won't work.");
389 cmddata[0]=CCCMD_HALT; //0x44
396 cmddata[0]=CCCMD_RESUME; //0x4C
403 //! Step an instruction
404 void cc_step_instr(){
405 cmddata[0]=CCCMD_STEP_INSTR; //0x5C
411 //! Debug an instruction.
412 void cc_debug_instr(unsigned char len){
413 //Bottom two bits of command indicate length.
414 unsigned char cmd=CCCMD_DEBUG_INSTR+(len&0x3); //0x54+len
416 cctrans8(cmd); //Second command code
417 cccmd(len&0x3); //Command itself.
422 //! Debug an instruction, for local use.
423 unsigned char cc_debug(unsigned char len,
427 unsigned char cmd=CCCMD_DEBUG_INSTR+(len&0x3);//0x54+len
437 return cctrans8(0x00);
440 //! Fetch a byte of code memory.
441 unsigned char cc_peekcodebyte(unsigned long adr){
442 /** See page 9 of SWRA124 */
443 unsigned char bank=adr>>15,
449 //MOV MEMCTR, (bank*16)+1
450 cc_debug(3, 0x75, 0xC7, (bank<<4) + 1);
452 cc_debug(3, 0x90, hb, lb);
456 cc_debug(2, 0xE4, 0, 0);
458 toret=cc_debug(3, 0x93, 0, 0);
460 //cc_debug(1, 0xA3, 0, 0);
466 //! Set a byte of data memory.
467 unsigned char cc_pokedatabyte(unsigned int adr,
474 cc_debug(3, 0x90, hb, lb);
476 cc_debug(2, 0x74, val, 0);
478 cc_debug(1, 0xF0, 0, 0);
482 DEBUG_INSTR(IN: 0x90, HIBYTE(address), LOBYTE(address), OUT: Discard);
483 for (n = 0; n < count; n++) {
484 DEBUG_INSTR(IN: 0x74, inputArray[n], OUT: Discard);
485 DEBUG_INSTR(IN: 0xF0, OUT: Discard);
486 DEBUG_INSTR(IN: 0xA3, OUT: Discard);
491 //! Fetch a byte of data memory.
492 unsigned char cc_peekdatabyte(unsigned int adr){
499 cc_debug(3, 0x90, hb, lb);
501 //Must be 2, perhaps for clocking?
502 toret=cc_debug(3, 0xE0, 0, 0);
506 DEBUG_INSTR(IN: 0x90, HIBYTE(address), LOBYTE(address), OUT: Discard);
507 for (n = 0; n < count; n++) {
508 DEBUG_INSTR(IN: 0xE0, OUT: outputArray[n]);
509 DEBUG_INSTR(IN: 0xA3, OUT: Discard);