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
60 //Begin a new transaction.
65 //! Read and write an CCSPI byte.
66 u8 ccspitrans8(u8 byte){
67 register unsigned int bit;
68 //This function came from the CCSPI Wikipedia article.
71 for (bit = 0; bit < 8; bit++) {
72 /* write MOSI on trailing edge of previous clock */
81 /* read MISO on trailing edge */
91 u8 ccspi_regwrite(u8 reg, const u8 *buf, int len){
102 u8 ccspi_regread(u8 reg, u8 *buf, int len){
105 reg=ccspitrans8(reg);
107 *buf++=ccspitrans8(0);
113 //! Handles a Chipcon SPI command.
114 void ccspi_handle_fn( uint8_t const app,
119 //debugstr("Chipcon SPI handler.");
123 cmddata[0]|=0x40; //Set the read bit.
128 CLRSS; //Drop !SS to begin transaction.
130 cmddata[i]=ccspitrans8(cmddata[i]);
131 SETSS; //Raise !SS to end transaction.
132 txdata(app,verb,len);
140 //Has there been an overflow?
142 debugstr("Clearing overflow");
144 ccspitrans8(0x08); //SFLUSHRX
150 //Wait for completion.
155 ccspitrans8(CCSPI_RXFIFO | 0x40);
156 //ccspitrans8(0x3F|0x40);
157 cmddata[0]=0xff; //to be replaced with length
158 for(i=0;i<cmddata[0]+2;i++)
159 cmddata[i]=ccspitrans8(0xde);
164 ccspitrans8(0x08); //SFLUSHRX
166 //Only should transmit length of one more than the reported
167 // length of the frame, which holds the length byte:
168 txdata(app,verb,cmddata[0]+1);
174 debugstr("Can't RX a packet with SFD and FIFOP definitions.");
181 ccspitrans8(CCSPI_SFLUSHRX);
188 #if defined(FIFOP) && defined(SFD) && defined(FIFO) && defined(PLED2DIR) && defined(PLED2PIN) && defined(PLED2OUT)
189 txdata(app,verb,1); //Just sending some response back to client
191 //Wait until a packet is received
193 //Turn on LED 2 (green) as signal
194 PLED2DIR |= PLED2PIN;
195 PLED2OUT &= ~PLED2PIN;
197 //Put radio in TX mode
202 //Load the jamming packet.
203 //Note: attempts to preload this actually slowed the jam time down from 7 to 9 bytes.
205 ccspitrans8(CCSPI_TXFIFO);
206 char pkt[15] = {0x0f, 0x01, 0x08, 0x82, 0xff, 0xff, 0xff, 0xff, 0xde, 0xad, 0xbe, 0xef, 0xba, 0xbe, 0xc0};
207 //char pkt[12] = {0x0c, 0x01, 0x08, 0x82, 0xff, 0xff, 0xff, 0xff, 0xde, 0xad, 0xbe, 0xef};
208 for(i=0;i<pkt[0];i++)
212 //Transmit the packet.
214 ccspitrans8(0x04); //STXON
216 msdelay(100); //Instead of waiting for pulse on SFD
219 ccspitrans8(0x09); //SFLUSHTX
222 //Turn off LED 2 (green) as signal
223 PLED2DIR |= PLED2PIN;
224 PLED2OUT |= PLED2PIN;
226 //TODO the firmware stops staying in this mode after a while, and stops jamming... need to find a fix.
229 debugstr("Can't reflexively jam without SFD, FIFO, FIFOP, and P2LEDx definitions - try using telosb platform.");
233 case CCSPI_REFLEX_AUTOACK:
234 #if defined(FIFOP) && defined(SFD) && defined(FIFO) && defined(PLED2DIR) && defined(PLED2PIN) && defined(PLED2OUT)
235 //txdata(app, verb, 1);
239 //Has there been an overflow in the RX buffer?
241 //debugstr("Clearing overflow");
243 ccspitrans8(0x08); //SFLUSHRX
247 //Wait until a packet is received
249 //Turn on LED 2 (green) as signal
250 PLED2DIR |= PLED2PIN;
251 PLED2OUT &= ~PLED2PIN;
253 //Put radio in TX mode
254 //Note: Not doing this slows down jamming, so can't jam short packets.
255 // However, if we do this, it seems to mess up our RXFIFO ability.
259 //Load the jamming packet
261 ccspitrans8(CCSPI_TXFIFO);
262 char pkt[7] = {0x07, 0x01, 0x08, 0xff, 0xff, 0xff, 0xff};
263 for(i=0;i<pkt[0];i++)
266 //Transmit the jamming packet
268 ccspitrans8(0x04); //STXON
270 msdelay(200); //Instead of examining SFD line status
273 ccspitrans8(0x09); //SFLUSHTX
276 //Get the orignally received packet, up to the seqnum field.
278 ccspitrans8(CCSPI_RXFIFO | 0x40);
280 cmddata[i]=ccspitrans8(0xde);
284 ccspitrans8(0x08); //SFLUSHRX
286 //Send the sequence number of the jammed packet back to the client
287 //itoa(cmddata[3], byte, 16);
289 //txdata(app,verb,cmddata[3]);
291 //TODO turn on AUTOCRC for it to apply to the TX???
292 // this may overcome issues of bad crc / length issues?
293 //mdmctrl0 (0x11) register set bit 5 to true.
295 //Create the forged ACK packet
296 cmddata[0] = 6; //length of ack frame plus length
297 cmddata[1] = 0x02; //first byte of FCF
298 cmddata[2] = 0x00; //second byte of FCF
299 //[3] is already filled with the sequence number
303 int q = (crc ^ c) & 15; //Do low-order 4 bits
304 crc = (crc / 16) ^ (q * 4225);
305 q = (crc ^ (c / 16)) & 15; //And high 4 bits
306 crc = (crc / 16) ^ (q * 4225);
308 cmddata[4] = crc & 0xFF;
309 cmddata[5] = (crc >> 8) & 0xFF;
311 for(i=0;i<cmddata[0];i++) {
312 itoa(cmddata[i], byte, 16);
315 //Load the forged ACK packet
317 ccspitrans8(CCSPI_TXFIFO);
318 for(i=0;i<cmddata[0];i++)
319 ccspitrans8(cmddata[i]);
321 //Transmit the forged ACK packet
324 ccspitrans8(0x04); //STXON
326 msdelay(200); //TODO try doing this based on SFD line status instead
329 ccspitrans8(0x09); //SFLUSHTX
332 //TODO disable AUTOCRC here again to go back to promiscous mode
334 //Turn off LED 2 (green) as signal
335 PLED2DIR |= PLED2PIN;
336 PLED2OUT |= PLED2PIN;
338 //TODO the firmware stops staying in this mode after a while, and stops jamming... need to find a fix.
340 debugstr("Can't reflexively jam without SFD, FIFO, FIFOP, and P2LEDx definitions - try using telosb platform.");
348 ccspitrans8(CCSPI_SFLUSHTX);
356 //Wait for last packet to TX.
357 //while(ccspi_status()&BIT3);
361 ccspitrans8(CCSPI_TXFIFO);
362 for(i=0;i<cmddata[0];i++)
363 ccspitrans8(cmddata[i]);
366 //Transmit the packet.
368 ccspitrans8(0x04); //STXON
371 //Wait for the pulse on SFD, after which the packet has been sent.
377 ccspitrans8(0x09); //SFLUSHTX
382 debugstr("Can't TX a packet with SFD and FIFOP definitions.");
387 debugstr("Not yet supported in CCSPI");