EM260 extensions to SPI are almost ready.

[goodfet] / firmware / apps / spi / spi.c

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index 3da3135..47c42c5 100644 (file)
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -26,6 +26,7 @@ void spisetup(){
   SETSS;
   P5DIR|=MOSI+SCK+BIT0; //BIT0 might be SS
   P5DIR&=~MISO;
+  DIRSS;
   
   //Begin a new transaction.
   CLRSS; 
@@ -53,7 +54,6 @@ unsigned char spitrans8(unsigned char byte){
     byte |= READMISO;
     CLRCLK;
   }
-  
   return byte;
 }
 
@@ -219,11 +219,27 @@ 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.
+}
+
 //! Handles a monitor command.
 void spihandle(unsigned char app,
               unsigned char verb,
               unsigned long len){
   unsigned long i;
+  static int state=0;
   
   //Raise !SS to end transaction, just in case we forgot.
   SETSS;
@@ -239,8 +255,57 @@ 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
+    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.");
+    */
+    
+    //if(!state++)
+    //if(state++&1)
+    em260_wake();
+    
+    SETMOSI; //Autodetected SPI mode.
+    CLRSS; //Drop !SS to begin transaction.
+    //Host to slave.  Ignore data.
+    for(i=0;i<len;i++)
+      spitrans8(cmddata[i]);
 
-
+    //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.");
+    
+    len=1;
+    while(
+         (cmddata[len++]=spitrans8(0xFF))!=0xA7
+         );
+    
+    
+    SETSS;  //Raise !SS to end transaction.
+    txdata(app,verb,len);
+    break;
+    
+    
   case SPI_JEDEC://Grab 3-byte JEDEC ID.
     CLRSS; //Drop !SS to begin transaction.
     spitrans8(0x9f);
@@ -250,8 +315,7 @@ 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;