X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fspi%2Fspi.c;h=cba47969b6ffc924e301694a479373082c65e036;hp=3da313539d8a9059a93f7d32d8454d0586b7c005;hb=c16ef9294fa7c938283a44a9a1d268fd88cd4ea8;hpb=ba4e9392ba615ed84d47576fe973057f89bb8998;ds=sidebyside

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index 3da3135..cba4796 100644
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -17,8 +17,7 @@
 //This could be more accurate.
 //Does it ever need to be?
 #define SPISPEED 0
-#define SPIDELAY(x)
-//delay(x)
+#define SPIDELAY(x) delay(x)
 
 
 //! Set up the pins for SPI mode.
@@ -26,10 +25,13 @@ void spisetup(){
   SETSS;
   P5DIR|=MOSI+SCK+BIT0; //BIT0 might be SS
   P5DIR&=~MISO;
+  DIRSS;
   
   //Begin a new transaction.
+  
   CLRSS; 
   SETSS;
+  
 }
 
 
@@ -46,14 +48,15 @@ unsigned char spitrans8(unsigned char byte){
     else
       CLRMOSI;
     byte <<= 1;
- 
+    
+    //SPIDELAY(100);
     SETCLK;
+    //SPIDELAY(100);
   
     /* read MISO on trailing edge */
     byte |= READMISO;
     CLRCLK;
   }
-  
   return byte;
 }
 
@@ -219,15 +222,90 @@ void spiflash_erasesector(unsigned long adr){
 }
 
 
+//! Wake an EM260 Radio
+void em260_wake(){
+  //debugstr("Waking EM260.");
+  #define RST BIT6
+  P2DIR|=RST;
+  SETRST;
+  delay(1024);
+  
+  CLRRST;//Wake chip.
+  while(P4IN&1);
+  SETRST;//Woken.
+  //debugstr("EM260 is now awake.");
+  delay(1024);  //DO NOT REMOVE, fails without.
+}
+//! Handle an EM260 exchange.
+void spi_rw_em260(u8 app, u8 verb, u32 len){
+  unsigned long i;
+  u8 lastin;
+    
+  P4DIR=0; //TODO ASAP remove P4 references.
+  P4OUT=0xFF;
+  P4REN=0xFF;
+    
+  //See GoodFETEM260.py for details.
+  //The EM260 requires that the host wait for the client.
+    
+  /*
+    if((~P4IN)&1)
+    debugstr("Detected HOST_INT.");
+  */
+    
+  em260_wake();
+  
+ em260woken:
+    
+  SETMOSI; //Autodetected SPI mode.
+  CLRSS; //Drop !SS to begin transaction.
+  //Host to slave.  Ignore data.
+  for(i=0;i<len;i++){
+    lastin=spitrans8(cmddata[i]);
+    if(lastin!=0xFF){
+      //debugstr("EM260 transmission interrupted.");
+      cmddata[0]=lastin;
+      goto response;
+    }
+  }
+  //debugstr("Finished transmission to EM260.");
+    
+  //Wait for nHOST_INT to drop.
+  i=0xffff;
+  
+  /*
+  while(P4IN&1
+	&& --i
+	)
+    spitrans8(0xFF);
+  */
+  while((cmddata[0]=spitrans8(0xFF))==0xFF
+	&& --i);
+  
+  if(!i)
+    debugstr("Gave up on host interrupt.");
+  
+ response:
+  len=1;
+  while(
+	(cmddata[len++]=spitrans8(0xFF))!=0xA7
+	);
+  SETSS;  //Raise !SS to end transaction.
+  
+  txdata(app,verb,len);
+  return;
+}
+
 //! Handles a monitor command.
 void spihandle(unsigned char app,
 	       unsigned char verb,
 	       unsigned long len){
   unsigned long i;
   
+  
   //Raise !SS to end transaction, just in case we forgot.
   SETSS;
-  spisetup();
+  //spisetup();
   
   switch(verb){
     //PEEK and POKE might come later.
@@ -239,8 +317,11 @@ void spihandle(unsigned char app,
     SETSS;  //Raise !SS to end transaction.
     txdata(app,verb,len);
     break;
-
-
+    
+  case SPI_RW_EM260:  //SPI exchange with an EM260
+    spi_rw_em260(app,verb,len);
+    break;
+    
   case SPI_JEDEC://Grab 3-byte JEDEC ID.
     CLRSS; //Drop !SS to begin transaction.
     spitrans8(0x9f);
@@ -250,8 +331,7 @@ void spihandle(unsigned char app,
     txdata(app,verb,len);
     SETSS;  //Raise !SS to end transaction.
     break;
-
-
+    
   case PEEK://Grab 128 bytes from an SPI Flash ROM
     spiflash_peek(app,verb,len);
     break;