SPI Flash writing support.

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

diff --git a/firmware/apps/spi/spi.c b/firmware/apps/spi/spi.c
index 5e76205..0a15799 100644 (file)
--- a/firmware/apps/spi/spi.c
+++ b/firmware/apps/spi/spi.c
@@ -31,10 +31,10 @@
 
 
 //! Set up the pins for SPI mode.
-unsigned char spisetup(){
+void spisetup(){
+  P5OUT|=SS;
   P5DIR|=MOSI+SCK+SS;
   P5DIR&=~MISO;
-  P5OUT|=SS;
 }
 
 //! Read and write an SPI bit.
@@ -66,6 +66,16 @@ 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.
+}
+
 //! Handles a monitor command.
 void spihandle(unsigned char app,
               unsigned char verb,
@@ -76,11 +86,50 @@ void spihandle(unsigned char app,
   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.
+    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; //Drop !SS to begin transaction.
+    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);