2 \author Travis Goodspeed
3 \brief Chipcon SPI Register Interface
5 Unfortunately, there is very little similarity between the CC2420
6 and the CC2500, to name just two of the myriad of Chipcon SPI
7 radios. Auto-detection will be a bit difficult, but more to the
8 point, all high level functionality must be moved into the client.
11 //Higher level left to client application.
15 #include <stdlib.h> //added for itoa
20 //! Handles a Chipcon SPI command.
21 void ccspi_handle_fn( uint8_t const app,
25 // define the ccspi app's app_t
26 app_t const ccspi_app = {
38 "\tThe CCSPI app adds support for the Chipcon SPI register\n"
39 "\tinterface. Unfortunately, there is very little similarity\n"
40 "\tbetween the CC2420 and the CC2500, to name just two of the\n"
41 "\tmyriad of Chipcon SPI radios. Auto-detection will be a bit\n"
42 "\tdifficult, but more to the point, all high level functionality\n"
43 "\tmust be moved into the client.\n"
46 //! Set up the pins for CCSPI mode.
53 //P4OUT|=BIT5; //activate CC2420 voltage regulator
57 /*P4OUT&=~BIT6; FIXME Does the new code work on Z1 and Telosb?
62 //Begin a new transaction.
67 //! Read and write an CCSPI byte.
68 u8 ccspitrans8(u8 byte){
69 register unsigned int bit;
70 //This function came from the CCSPI Wikipedia article.
73 for (bit = 0; bit < 8; bit++) {
74 /* write MOSI on trailing edge of previous clock */
83 /* read MISO on trailing edge */
92 //! Reflexively jam on the present channel.
93 void ccspireflexjam(u16 delay){
95 #if defined(FIFOP) && defined(SFD) && defined(FIFO) && defined(PLED2DIR) && defined(PLED2PIN) && defined(PLED2OUT)
98 debugstr("Reflex jamming until reset.");
100 txdata(CCSPI,CCSPI_REFLEX,1); //Let the client continue its business.
102 //Wait until a packet is received
104 //Has there been an overflow in the RX buffer?
106 //debugstr("Clearing RX overflow");
108 ccspitrans8(0x08); //SFLUSHRX
112 //Turn on LED 2 (green) as signal
113 PLED2DIR |= PLED2PIN;
114 PLED2OUT &= ~PLED2PIN;
118 //Wait a few us to send it.
121 //Transmit the packet.
127 //Load the next jamming packet.
128 //Note: attempts to preload this actually slowed the jam time down from 7 to 9 bytes.
130 ccspitrans8(CCSPI_TXFIFO);
131 char pkt[5] = {0x05, 0, 0, 0, 0};
132 //char pkt[15] = {0x0f, 0x01, 0x08, 0x82, 0xff, 0xff, 0xff, 0xff, 0xde, 0xad, 0xbe, 0xef, 0xba, 0xbe, 0xc0};
133 //char pkt[12] = {0x0c, 0x01, 0x08, 0x82, 0xff, 0xff, 0xff, 0xff, 0xde, 0xad, 0xbe, 0xef};
134 for(i=0;i<pkt[0];i++)
138 //* I think this might be unnecessary.
139 //msdelay(100+delay); //Instead of waiting for pulse on SFD
143 ccspitrans8(0x09); //SFLUSHTX
147 //Turn off LED 2 (green) as signal
148 PLED2DIR |= PLED2PIN;
149 PLED2OUT |= PLED2PIN;
152 debugstr("Can't reflexively jam without SFD, FIFO, FIFOP, and P2LEDx definitions - try using telosb platform.");
159 //! Writes a register
160 u8 ccspi_regwrite(u8 reg, const u8 *buf, int len){
163 reg=ccspitrans8(reg);
171 u8 ccspi_regread(u8 reg, u8 *buf, int len){
174 reg=ccspitrans8(reg);
176 *buf++=ccspitrans8(0);
182 //! Handles a Chipcon SPI command.
183 void ccspi_handle_fn( uint8_t const app,
189 //debugstr("Chipcon SPI handler.");
193 cmddata[0]|=0x40; //Set the read bit.
198 CLRSS; //Drop !SS to begin transaction.
199 j=cmddata[0];//Backup address.
201 cmddata[i]=ccspitrans8(cmddata[i]);
202 SETSS; //Raise !SS to end transaction.
203 cmddata[0]=j&~0x40;//Restore address.
204 txdata(app,verb,len);
212 //Has there been an overflow?
214 //debugstr("Clearing overflow");
216 ccspitrans8(0x08); //SFLUSHRX
222 //Wait for completion.
227 ccspitrans8(CCSPI_RXFIFO | 0x40);
228 //ccspitrans8(0x3F|0x40);
229 cmddata[0]=0xff; //to be replaced with length
230 for(i=0;i<cmddata[0]+2;i++)
231 cmddata[i]=ccspitrans8(0xde);
236 ccspitrans8(0x08); //SFLUSHRX
240 //Only should transmit length of one more than the reported
241 // length of the frame, which holds the length byte:
242 txdata(app,verb,cmddata[0]+1);
248 debugstr("Can't RX a packet with SFD and FIFOP definitions.");
255 ccspitrans8(CCSPI_SFLUSHRX);
262 ccspireflexjam(len?cmddataword[0]:0);
265 case CCSPI_REFLEX_AUTOACK:
266 #if defined(FIFOP) && defined(SFD) && defined(FIFO) && defined(PLED2DIR) && defined(PLED2PIN) && defined(PLED2OUT)
267 //txdata(app, verb, 1);
271 //Has there been an overflow in the RX buffer?
273 //debugstr("Clearing overflow");
275 ccspitrans8(0x08); //SFLUSHRX
279 //Wait until a packet is received
281 //Turn on LED 2 (green) as signal
282 PLED2DIR |= PLED2PIN;
283 PLED2OUT &= ~PLED2PIN;
285 //Put radio in TX mode
286 //Note: Not doing this slows down jamming, so can't jam short packets.
287 // However, if we do this, it seems to mess up our RXFIFO ability.
291 //Load the jamming packet
293 ccspitrans8(CCSPI_TXFIFO);
294 char pkt[7] = {0x07, 0x01, 0x08, 0xff, 0xff, 0xff, 0xff};
295 for(i=0;i<pkt[0];i++)
298 //Transmit the jamming packet
300 ccspitrans8(0x04); //STXON
302 msdelay(200); //Instead of examining SFD line status
305 ccspitrans8(0x09); //SFLUSHTX
308 //Get the orignally received packet, up to the seqnum field.
310 ccspitrans8(CCSPI_RXFIFO | 0x40);
312 cmddata[i]=ccspitrans8(0xde);
316 ccspitrans8(0x08); //SFLUSHRX
318 //Send the sequence number of the jammed packet back to the client
319 //itoa(cmddata[3], byte, 16);
321 //txdata(app,verb,cmddata[3]);
323 //TODO turn on AUTOCRC for it to apply to the TX???
324 // this may overcome issues of bad crc / length issues?
325 //mdmctrl0 (0x11) register set bit 5 to true.
327 //Create the forged ACK packet
328 cmddata[0] = 6; //length of ack frame plus length
329 cmddata[1] = 0x02; //first byte of FCF
330 cmddata[2] = 0x00; //second byte of FCF
331 //[3] is already filled with the sequence number
335 int q = (crc ^ c) & 15; //Do low-order 4 bits
336 crc = (crc / 16) ^ (q * 4225);
337 q = (crc ^ (c / 16)) & 15; //And high 4 bits
338 crc = (crc / 16) ^ (q * 4225);
340 cmddata[4] = crc & 0xFF;
341 cmddata[5] = (crc >> 8) & 0xFF;
343 for(i=0;i<cmddata[0];i++) {
344 itoa(cmddata[i], byte, 16);
347 //Load the forged ACK packet
349 ccspitrans8(CCSPI_TXFIFO);
350 for(i=0;i<cmddata[0];i++)
351 ccspitrans8(cmddata[i]);
353 //Transmit the forged ACK packet
356 ccspitrans8(0x04); //STXON
358 msdelay(200); //TODO try doing this based on SFD line status instead
361 ccspitrans8(0x09); //SFLUSHTX
364 //TODO disable AUTOCRC here again to go back to promiscous mode
366 //Turn off LED 2 (green) as signal
367 PLED2DIR |= PLED2PIN;
368 PLED2OUT |= PLED2PIN;
370 //TODO the firmware stops staying in this mode after a while, and stops jamming... need to find a fix.
372 debugstr("Can't reflexively jam without SFD, FIFO, FIFOP, and P2LEDx definitions - try using telosb platform.");
380 ccspitrans8(CCSPI_SFLUSHTX);
388 //Wait for last packet to TX.
389 //while(ccspi_status()&BIT3);
393 ccspitrans8(0x09); //SFLUSHTX
399 ccspitrans8(CCSPI_TXFIFO);
400 for(i=0;i<cmddata[0];i++)
401 ccspitrans8(cmddata[i]);
404 //Transmit the packet.
406 ccspitrans8(0x04); //STXON
409 //Wait for the pulse on SFD, after which the packet has been sent.
415 debugstr("Can't TX a packet with SFD and FIFOP definitions.");
420 debugstr("Not yet supported in CCSPI");