Improving CC2420 packet reception.

[goodfet] / firmware / apps / radios / ccspi.c

diff --git a/firmware/apps/radios/ccspi.c b/firmware/apps/radios/ccspi.c
index ff46616..cc44d4b 100644 (file)
--- a/firmware/apps/radios/ccspi.c
+++ b/firmware/apps/radios/ccspi.c
@@ -54,10 +54,14 @@ void ccspisetup(){
   DIRCE;
   
   P4OUT|=BIT5; //activate CC2420 voltage regulator
-  P4OUT|=BIT6; //bring CC2420 out of reset
+  msdelay(100);
+  
+  //Reset the CC2420.
+  P4OUT&=~BIT6;
+  P4OUT|=BIT6;
   
   //Begin a new transaction.
-  CLRSS; 
+  CLRSS;
   SETSS;
 }
 
@@ -118,45 +122,45 @@ void ccspi_handle_fn( uint8_t const app,
   //debugstr("Chipcon SPI handler.");
   
   switch(verb){
+  case PEEK:
+    cmddata[0]|=0x40; //Set the read bit.
+    //DO NOT BREAK HERE.
   case READ:
   case WRITE:
+  case POKE:
     CLRSS; //Drop !SS to begin transaction.
     for(i=0;i<len;i++)
       cmddata[i]=ccspitrans8(cmddata[i]);
     SETSS;  //Raise !SS to end transaction.
     txdata(app,verb,len);
     break;
-
-  case PEEK://Grab CCSPI Register
-    CLRSS; //Drop !SS to begin transaction.
-    cmddata[0]=ccspitrans8(/*CCSPI_R_REGISTER |*/ cmddata[0]); //000A AAAA
-    for(i=1;i<len;i++)
-      cmddata[i]=ccspitrans8(cmddata[i]);
-    SETSS;  //Raise !SS to end transaction.
-    txdata(app,verb,len);
-    break;
-    
-  case POKE://Poke CCSPI Register
-    CLRSS; //Drop !SS to begin transaction.
-    cmddata[0]=ccspitrans8(/* CCSPI_W_REGISTER |*/ 0x40 | cmddata[0]); //02AA AAAA
-    for(i=1;i<len;i++)
-      cmddata[i]=ccspitrans8(cmddata[i]);
-    SETSS;  //Raise !SS to end transaction.
-    txdata(app,verb,len);
-    break;
   case SETUP:
     ccspisetup();
     txdata(app,verb,0);
     break;
   case CCSPI_RX:
-    //Get the packet.
-    CLRSS;
-    ccspitrans8(CCSPI_RXFIFO);
-    for(i=0;i<32;i++)
-      cmddata[i]=ccspitrans8(0xde);
-    SETSS;
-    //no break
-    txdata(app,verb,32);
+    #ifdef FIFOP
+    //Wait for any incoming packet to finish.
+    while(SFD);
+    
+    //Is there a packet?
+    if((!SFD)&FIFOP){
+      //Get the packet.
+      CLRSS;
+      ccspitrans8(CCSPI_RXFIFO);
+      for(i=0;i<32;i++)
+       cmddata[i]=ccspitrans8(0xde);
+      SETSS;
+      //no break
+      txdata(app,verb,32);
+    }else{
+      //No packet.
+      txdata(app,verb,0);
+    }
+    #else
+    debugstr("Can't RX a packet with SFD and FIFOP definitions.");
+    txdata(app,NOK,0);
+    #endif
     break;
   case CCSPI_RX_FLUSH:
     //Flush the buffer.
@@ -167,6 +171,10 @@ void ccspi_handle_fn( uint8_t const app,
     //Return the packet.
     txdata(app,verb,32);
     break;
+  case CCSPI_REFLEX:
+    debugstr("Coming soon.");
+    txdata(app,verb,0);
+    break;
   case CCSPI_TX:
   case CCSPI_TX_FLUSH:
   default: