X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fspi%2Fspi.c;h=f4c6560477548099466f38ca0cc083b7a4499262;hp=e6fb370a6c6b3c71485f67a5afe515bc6a5a649d;hb=6ee7ff03148c7af2a50695337910e7fd6906d476;hpb=aa1ad64b8f1a87590c9a94d32a1561bca33e843c

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index e6fb370..f4c6560 100644
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -17,6 +17,7 @@
 #define MISO BIT2
 #define SCK  BIT3
 
+
 //This could be more accurate.
 //Does it ever need to be?
 #define SPISPEED 0
@@ -31,12 +32,17 @@
 
 
 //! Set up the pins for SPI mode.
-unsigned char spisetup(){
+void spisetup(){
+  P5OUT|=SS;
   P5DIR|=MOSI+SCK+SS;
   P5DIR&=~MISO;
+  
+  //Begin a new transaction.
+  P5OUT&=~SS; 
   P5OUT|=SS;
 }
 
+
 //! Read and write an SPI bit.
 unsigned char spitrans8(unsigned char byte){
   unsigned int bit;
@@ -66,11 +72,81 @@ unsigned char spitrans8(unsigned char byte){
   return byte;
 }
 
+
+//! Enable SPI writing
+void spiflash_wrten(){
+  P5OUT&=~SS; //Drop !SS to begin transaction.
+  spitrans8(0x04);//Write Disable
+  P5OUT|=SS;  //Raise !SS to end transaction.
+  P5OUT&=~SS; //Drop !SS to begin transaction.
+  spitrans8(0x06);//Write Enable
+  P5OUT|=SS;  //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.
+  spitrans8(0x05);//GET STATUS
+  c=spitrans8(0xFF);
+  P5OUT|=SS;  //Raise !SS to end transaction.
+  return c;
+}
+
+
+//! Grab the SPI flash status byte.
+void spiflash_setstatus(unsigned char c){
+  P5OUT&=~SS; //Drop !SS to begin transaction.
+  spitrans8(0x01);//SET STATUS
+  spitrans8(c);
+  P5OUT|=SS;  //Raise !SS to end transaction.
+  //return c;
+}
+
+//! Peek some blocks.
+void spiflash_peek(unsigned char app,
+		   unsigned char verb,
+		   unsigned char len){
+  register char blocks=(len>3?cmddata[3]:1);
+  unsigned char i,j;
+  
+  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]);
+  
+  //Send reply header
+  len=0x80;//128 byte chunk, repeated for each block
+  serial_tx(app);
+  serial_tx(verb);
+  serial_tx(len); //multiplied by block count.
+  
+  while(blocks--){
+    for(i=0;i<len;i++)
+      serial_tx(spitrans8(0));
+    
+    /* old fashioned
+    for(i=0;i<len;i++)
+      cmddata[i]=spitrans8(0);
+    txdata(app,verb,len);
+    */
+  }
+  P5OUT|=SS;  //Raise !SS to end transaction.
+}
+
 //! Handles a monitor command.
 void spihandle(unsigned char app,
 	       unsigned char verb,
 	       unsigned char len){
   unsigned char i;
+  
+  
+  //Raise !SS to end transaction, just in case we forgot.
+  P5OUT|=SS;  
+  
   switch(verb){
     //PEEK and POKE might come later.
   case READ:
@@ -81,9 +157,57 @@ void spihandle(unsigned char app,
     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
+    spiflash_peek(app,verb,len);
+    break;
+
+
+  case POKE://Poke up bytes from an SPI Flash ROM.
+    spiflash_setstatus(0x02);
+    spiflash_wrten();
+    
+    P5OUT&=~SS; //Drop !SS to begin transaction.
+    spitrans8(0x02); //Poke command.
+    
+    //First three bytes are address, then data.
+    for(i=0;i<len;i++)
+      spitrans8(cmddata[i]);
+    P5OUT|=SS;  //Raise !SS to end transaction.
+    
+    while(spiflash_status()&0x01)//while busy
+      P1OUT^=1;
+    P1OUT&=~1;
+    
+    txdata(app,verb,len);
+    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;
   }
+  
 }