X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=firmware%2Fapps%2Fspi%2Fspi.c;h=aa3c5ecff4154876534705e2f2fffbea56fdfc9a;hb=022d9128fe8a5783e3b804581fe7996d17095ef6;hp=785c47600f73ee7f860ef3e88153e1952795010d;hpb=e858c51543d928d837578d3e03dd5686e888220e;p=goodfet

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index 785c476..aa3c5ec 100644
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -1,5 +1,7 @@
-//GoodFET SPI Application
-//Handles basic I/O
+/*! \file spi.c
+  \author Travis Goodspeed
+  \brief SPI Master
+*/
 
 //Higher level left to client application.
 
@@ -10,36 +12,53 @@
 #include <io.h>
 #include <iomacros.h>
 
+#include "spi.h"
 
-//Pins and I/O
-#define SS   BIT0
-#define MOSI BIT1
-#define MISO BIT2
-#define SCK  BIT3
+//! 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 SETMOSI P5OUT|=MOSI
-#define CLRMOSI P5OUT&=~MOSI
-#define SETCLK P5OUT|=SCK
-#define CLRCLK P5OUT&=~SCK
-#define READMISO (P5IN&MISO?1:0)
-
-
 
 //! Set up the pins for SPI mode.
 void spisetup(){
-  P5OUT|=SS;
-  P5DIR|=MOSI+SCK+SS;
-  P5DIR&=~MISO;
+  SETSS;
+  SPIDIR|=MOSI+SCK+BIT0; //BIT0 might be SS
+  SPIDIR&=~MISO;
+  DIRSS;
+  
+  //Begin a new transaction.
+  
+  CLRSS; 
+  SETSS;
 }
 
-//! Read and write an SPI bit.
+
+//! Read and write an SPI byte.
 unsigned char spitrans8(unsigned char byte){
-  unsigned int bit;
+  register unsigned int bit;
   //This function came from the SPI Wikipedia article.
   //Minor alterations.
   
@@ -50,78 +69,319 @@ unsigned char spitrans8(unsigned char byte){
     else
       CLRMOSI;
     byte <<= 1;
- 
-    /* half a clock cycle before leading/rising edge */
-    SPIDELAY(SPISPEED/2);
+    
+    //SPIDELAY(100);
     SETCLK;
- 
-    /* half a clock cycle before trailing/falling edge */
-    SPIDELAY(SPISPEED/2);
- 
+    //SPIDELAY(100);
+  
     /* read MISO on trailing edge */
     byte |= READMISO;
     CLRCLK;
   }
-  
   return byte;
 }
 
+
 //! Enable SPI writing
 void spiflash_wrten(){
-    P5OUT&=~SS; //Drop !SS to begin transaction.
-    spitrans8(0x06);//Chip Erase
-    P5OUT|=SS;  //Raise !SS to end transaction.
+  SETSS;
+  /*
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x04);//Write Disable
+  SETSS;  //Raise !SS to end transaction.
+  */
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x06);//Write Enable
+  SETSS;  //Raise !SS to end transaction.
 }
 
-//! Handles a monitor command.
-void spihandle(unsigned char app,
-	       unsigned char verb,
-	       unsigned char len){
+
+//! Grab the SPI flash status byte.
+unsigned char spiflash_status(){
+  unsigned char c;
+  SETSS;  //Raise !SS to end transaction.
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x05);//GET STATUS
+  c=spitrans8(0xFF);
+  SETSS;  //Raise !SS to end transaction.
+  return c;
+}
+
+
+//! Grab the SPI flash status byte.
+void spiflash_setstatus(unsigned char c){
+  SETSS;
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x01);//SET STATUS
+  spitrans8(c);
+  SETSS;  //Raise !SS to end transaction.
+  //return c;
+}
+
+
+//! Read a block to a buffer.
+void spiflash_peekblock(unsigned long adr,
+			unsigned char *buf,
+			unsigned int len){
   unsigned char i;
-  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;
-    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
-    P5OUT&=~SS; //Drop !SS to begin transaction.
-    spitrans8(0x03);//Flash Read Command
-    len=3;//write 3 byte pointer
-    for(i=0;i<len;i++)
-      spitrans8(cmddata[i]);
-    len=0x80;//128 byte chunk
-    for(i=0;i<len;i++)
-      cmddata[i]=spitrans8(0);
-    txdata(app,verb,len);
-    P5OUT|=SS;  //Raise !SS to end transaction.
-    break;
-  case POKE://Poke up bytes from an SPI Flash ROM.
+  
+  SETSS;
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x03);//Flash Read Command
+  
+  //Send address
+  spitrans8((adr&0xFF0000)>>16);
+  spitrans8((adr&0xFF00)>>8);
+  spitrans8(adr&0xFF);
+  
+  for(i=0;i<len;i++)
+    buf[i]=spitrans8(0);
+  SETSS;  //Raise !SS to end transaction.
+}
+
+//! Read a block to a buffer.
+void spiflash_pokeblock(unsigned long adr,
+			unsigned char *buf,
+			unsigned int len){
+  unsigned int i;
+  
+  SETSS;
+  
+  //if(len!=0x100)
+  //  debugstr("Non-standard block size.");
+  
+  while(spiflash_status()&0x01);//minor performance impact
+  
+  spiflash_setstatus(0x02);
+  spiflash_wrten();
+  
+  //Are these necessary?
+  //spiflash_setstatus(0x02);
+  //spiflash_wrten();
+  
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x02); //Poke command.
+  
+  //Send address
+  spitrans8((adr&0xFF0000)>>16);
+  spitrans8((adr&0xFF00)>>8);
+  spitrans8(adr&0xFF);
+
+  for(i=0;i<len;i++)
+    spitrans8(buf[i]);
+  SETSS;  //Raise !SS to end transaction.
+  
+  while(spiflash_status()&0x01);//minor performance impact
+  return;
+}
+
+
+//! Write many blocks to the SPI Flash.
+void spiflash_pokeblocks(unsigned long adr,
+			 unsigned char *buf,
+			 unsigned int len){
+  long off=0;//offset of this block
+  int blen;//length of this block
+  SETSS;
+  
+  while(off<len){
+    //calculate block length
+    blen=(len-off>0x100?0x100:len-off);
+    //write the block
+    spiflash_pokeblock(adr+off,
+		       buf+off,
+		       blen);
+    //add offset
+    off+=blen;
+  }
+}
+
+
+
+//! Peek some blocks.
+void spiflash_peek(unsigned char app,
+		   unsigned char verb,
+		   unsigned long len){
+  unsigned int i;
+  CLRSS; //Drop !SS to begin transaction.
+  spitrans8(0x03);//Flash Read Command
+  len=3;//write 3 byte pointer
+  for(i=0;i<len;i++)
+    spitrans8(cmddata[i]);
+  
+  //Send reply header
+  len=0x1000;
+  txhead(app,verb,len);
+  
+  while(len--)
+    serial_tx(spitrans8(0));
+  
+  SETSS;  //Raise !SS to end transaction.
+}
+
+
+//! Erase a sector.
+void spiflash_erasesector(unsigned long adr){
+  //debugstr("Erasing a 4kB sector.");
+
+  //Write enable.
+  spiflash_wrten();
+
+  //Begin
+  CLRSS;
+
+  //Second command.
+  spitrans8(0x20);
+  //Send address
+  spitrans8((adr&0xFF0000)>>16);
+  spitrans8((adr&0xFF00)>>8);
+  spitrans8(adr&0xFF);
+
+  SETSS;
+  while(spiflash_status()&0x01);//while busy
+  //debugstr("Erased.");
+}
+
+
+//! 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.
     
-    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.
-    txdata(app,verb,0);
-    break;
-  case SETUP:
-    spisetup();
-    txdata(app,verb,0);
-    break;
+  /*
+    if((~P4IN)&1)
+    debugstr("Detected HOST_INT.");
+  */
+    
+  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;
+	}
 }