Beginnings of info flash support. It isn't very good.
[goodfet] / firmware / apps / spi / spi.c
index ce21cb8..6e008a1 100644 (file)
@@ -12,7 +12,7 @@
 #include <io.h>
 #include <iomacros.h>
 
-#include <spi.h>
+#include "spi.h"
 
 //This could be more accurate.
 //Does it ever need to be?
@@ -35,7 +35,7 @@ void spisetup(){
 
 //! 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.
   
@@ -47,13 +47,8 @@ unsigned char spitrans8(unsigned char byte){
       CLRMOSI;
     byte <<= 1;
  
-    /* half a clock cycle before leading/rising edge */
-    SPIDELAY(SPISPEED/2);
     SETCLK;
-    /* half a clock cycle before trailing/falling edge */
-    SPIDELAY(SPISPEED/2);
+  
     /* read MISO on trailing edge */
     byte |= READMISO;
     CLRCLK;
@@ -120,18 +115,26 @@ void spiflash_peekblock(unsigned long adr,
   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 char i;
+  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.
   
@@ -144,12 +147,33 @@ void spiflash_pokeblock(unsigned long adr,
     spitrans8(buf[i]);
   SETSS;  //Raise !SS to end transaction.
   
-  while(spiflash_status()&0x01);
-  
+  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,
@@ -171,6 +195,30 @@ void spiflash_peek(unsigned char app,
   P5OUT|=SS;  //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.");
+}
+
+
 //! Handles a monitor command.
 void spihandle(unsigned char app,
               unsigned char verb,
@@ -210,24 +258,11 @@ void spihandle(unsigned char app,
 
 
   case POKE://Poke up bytes from an SPI Flash ROM.
-    spiflash_setstatus(0x02);
-    spiflash_wrten();
+    spiflash_pokeblocks(cmddatalong[0],//adr
+                       cmddata+4,//buf
+                       len-4);//len    
     
-    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)
-      P1OUT^=1;
-    
-    P1OUT&=~1;
-    
-    txdata(app,verb,len);
+    txdata(app,verb,0);
     break;