-//GoodFET SPI Application
-//Handles basic I/O
+/*! \file spi.c
+ \author Travis Goodspeed
+ \brief SPI Master
+*/
//Higher level left to client application.
#include <io.h>
#include <iomacros.h>
-
-//Pins and I/O
-#define SS BIT0
-#define MOSI BIT1
-#define MISO BIT2
-#define SCK BIT3
-
+#include "spi.h"
//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)
-
+#define SPIDELAY(x)
+//delay(x)
//! Set up the pins for SPI mode.
}
-//! 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.
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;
//! Enable SPI writing
void spiflash_wrten(){
+ SETSS;
+ /*
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.
void spiflash_setstatus(unsigned char c){
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ SETSS;
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x01);//SET STATUS
spitrans8(c);
- P5OUT|=SS; //Raise !SS to end transaction.
+ 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;
+
+ 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 char len){
- register char blocks=(len>3?cmddata[3]:1);
- unsigned char i,j;
-
+ unsigned long len){
+ unsigned int i;
P5OUT&=~SS; //Drop !SS to begin transaction.
spitrans8(0x03);//Flash Read Command
len=3;//write 3 byte pointer
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.
+ len=0x1000;
+ txhead(app,verb,len);
+
+ while(len--)
+ serial_tx(spitrans8(0));
- 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.
}
+
+//! 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,
- unsigned char len){
- unsigned char i;
-
+ unsigned long len){
+ unsigned long i;
//Raise !SS to end transaction, just in case we forgot.
- P5OUT|=SS;
+ P5OUT|=SS;
+ spisetup();
switch(verb){
//PEEK and POKE might come later.
case SPI_JEDEC://Grab 3-byte JEDEC ID.
P5OUT&=~SS; //Drop !SS to begin transaction.
spitrans8(0x9f);
- len=3;
+ 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);
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)//while busy
- P1OUT^=1;
- P1OUT&=~1;
-
- txdata(app,verb,len);
+ txdata(app,verb,0);
break;
P5OUT&=~SS; //Drop !SS to begin transaction.
spitrans8(0xC7);//Chip Erase
P5OUT|=SS; //Raise !SS to end transaction.
+
+
+ while(spiflash_status()&0x01)//while busy
+ P1OUT^=1;
+ P1OUT&=~1;
+
txdata(app,verb,0);
break;
-
case SETUP:
spisetup();
txdata(app,verb,0);
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