X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fspi%2Fspi.c;h=e07cdb544a43d8a8674eb51162bf4bc2f478e095;hp=fc310389e2f0f1fbf551e59d81cfa619528ea83b;hb=5fb0341d348e101b30794945a6c91546e25e8e7b;hpb=0351243d52f70e34790269e600c65413ddb4bc7c

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index fc31038..e07cdb5 100644
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -14,22 +14,46 @@
 
 #include "spi.h"
 
+//! Handles a monitor command.
+void spi_handle_fn( uint8_t const app,
+					uint8_t const verb,
+					uint32_t const len);
+
+// define the spi app's app_t
+app_t const spi_app = {
+
+	/* app number */
+	SPI,
+
+	/* handle fn */
+	spi_handle_fn,
+
+	/* name */
+	"SPI",
+
+	/* desc */
+	"\tThe SPI app handles the SPI bus protocol, turning\n"
+	"\tyour GoodFET into a USB-to-SPI adapter.\n"
+};
+
 //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.
 void spisetup(){
-  P5OUT|=SS;
-  P5DIR|=MOSI+SCK+SS;
+  SETSS;
+  P5DIR|=MOSI+SCK+BIT0; //BIT0 might be SS
   P5DIR&=~MISO;
+  DIRSS;
   
   //Begin a new transaction.
-  P5OUT&=~SS; 
-  P5OUT|=SS;
+  
+  CLRSS; 
+  SETSS;
+  
 }
 
 
@@ -46,14 +70,15 @@ 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;
 }
 
@@ -62,24 +87,24 @@ unsigned char spitrans8(unsigned char byte){
 void spiflash_wrten(){
   SETSS;
   /*
-  P5OUT&=~SS; //Drop !SS to begin transaction.
+  CLRSS; //Drop !SS to begin transaction.
   spitrans8(0x04);//Write Disable
-  P5OUT|=SS;  //Raise !SS to end transaction.
+  SETSS;  //Raise !SS to end transaction.
   */
-  P5OUT&=~SS; //Drop !SS to begin transaction.
+  CLRSS; //Drop !SS to begin transaction.
   spitrans8(0x06);//Write Enable
-  P5OUT|=SS;  //Raise !SS to end transaction.
+  SETSS;  //Raise !SS to end transaction.
 }
 
 
 //! Grab the SPI flash status byte.
 unsigned char spiflash_status(){
   unsigned char c;
-  P5OUT|=SS;  //Raise !SS to end transaction.
-  P5OUT&=~SS; //Drop !SS to begin transaction.
+  SETSS;  //Raise !SS to end transaction.
+  CLRSS; //Drop !SS to begin transaction.
   spitrans8(0x05);//GET STATUS
   c=spitrans8(0xFF);
-  P5OUT|=SS;  //Raise !SS to end transaction.
+  SETSS;  //Raise !SS to end transaction.
   return c;
 }
 
@@ -179,7 +204,7 @@ void spiflash_peek(unsigned char app,
 		   unsigned char verb,
 		   unsigned long len){
   unsigned int i;
-  P5OUT&=~SS; //Drop !SS to begin transaction.
+  CLRSS; //Drop !SS to begin transaction.
   spitrans8(0x03);//Flash Read Command
   len=3;//write 3 byte pointer
   for(i=0;i<len;i++)
@@ -192,7 +217,7 @@ void spiflash_peek(unsigned char app,
   while(len--)
     serial_tx(spitrans8(0));
   
-  P5OUT|=SS;  //Raise !SS to end transaction.
+  SETSS;  //Raise !SS to end transaction.
 }
 
 
@@ -219,71 +244,145 @@ void spiflash_erasesector(unsigned long adr){
 }
 
 
-//! 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.
-  P5OUT|=SS;
-  spisetup();
+//! Wake an EM260 Radio
+void em260_wake(){
+  //debugstr("Waking EM260.");
+  #define RST BIT6
+  P2DIR|=RST;
+  SETRST;
+  delay(1024);
   
-  switch(verb){
-    //PEEK and POKE might come later.
-  case READ:
-  case WRITE:
-    P5OUT&=~SS; //Drop !SS to begin transaction.
-    for(i=0;i<len;i++)
-      cmddata[i]=spitrans8(cmddata[i]);
-    P5OUT|=SS;  //Raise !SS to end transaction.
-    txdata(app,verb,len);
-    break;
-
-
-  case SPI_JEDEC://Grab 3-byte JEDEC ID.
-    P5OUT&=~SS; //Drop !SS to begin transaction.
-    spitrans8(0x9f);
-    len=3;  //Length is variable in some chips, 3 minimum.
-    for(i=0;i<len;i++)
-      cmddata[i]=spitrans8(cmddata[i]);
-    txdata(app,verb,len);
-    P5OUT|=SS;  //Raise !SS to end transaction.
-    break;
-
-
-  case PEEK://Grab 128 bytes from an SPI Flash ROM
-    spiflash_peek(app,verb,len);
-    break;
-
-
-  case POKE://Poke up bytes from an SPI Flash ROM.
-    spiflash_pokeblocks(cmddatalong[0],//adr
-			cmddata+4,//buf
-			len-4);//len    
+  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;
     
-    txdata(app,verb,0);
-    break;
-
-
-  case SPI_ERASE://Erase the SPI Flash ROM.
-    spiflash_wrten();
-    P5OUT&=~SS; //Drop !SS to begin transaction.
-    spitrans8(0xC7);//Chip Erase
-    P5OUT|=SS;  //Raise !SS to end transaction.
+  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.
     
-    while(spiflash_status()&0x01)//while busy
-      PLEDOUT^=PLEDPIN;
-    PLEDOUT&=~PLEDPIN;
+  /*
+    if((~P4IN)&1)
+    debugstr("Detected HOST_INT.");
+  */
     
-    txdata(app,verb,0);
-    break;
-
-  case SETUP:
-    spisetup();
-    txdata(app,verb,0);
-    break;
+  em260_wake();
+  
+    
+  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
+	);
+  if(cmddata[0]==0xFE)
+    while(len<cmddata[1]+3)
+      cmddata[len++]=spitrans8(0xFF);
+  SETSS;  //Raise !SS to end transaction.
+  
+  txdata(app,verb,len);
+  return;
+}
+
+//! Handles a monitor command.
+void spi_handle_fn( uint8_t const app,
+					uint8_t const verb,
+					uint32_t const len)
+{
+	unsigned long i, l;
+
+	//Raise !SS to end transaction, just in case we forgot.
+	SETSS;
+	//spisetup();
+
+	switch(verb)
+	{
+	case READ:
+	case WRITE:
+		CLRSS; //Drop !SS to begin transaction.
+		for(i=0;i<len;i++)
+		cmddata[i]=spitrans8(cmddata[i]);
+		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);
+		l=3;  //Length is variable in some chips, 3 minimum.
+		for(i = 0; i < l; i++)
+			cmddata[i]=spitrans8(cmddata[i]);
+		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;
+
+	case POKE://Poke up bytes from an SPI Flash ROM.
+		spiflash_pokeblocks(cmddatalong[0],//adr
+		cmddata+4,//buf
+		len-4);//len    
+		txdata(app,verb,0);
+		break;
+
+	case SPI_ERASE://Erase the SPI Flash ROM.
+		spiflash_wrten();
+		CLRSS; //Drop !SS to begin transaction.
+		spitrans8(0xC7);//Chip Erase
+		SETSS;  //Raise !SS to end transaction.
+
+		while(spiflash_status()&0x01)//while busy
+		PLEDOUT^=PLEDPIN;
+		PLEDOUT&=~PLEDPIN;
+
+		txdata(app,verb,0);
+		break;
+
+	case SETUP:
+		spisetup();
+		txdata(app,verb,0);
+		break;
+	}
 }