#define MISO BIT2
#define SCK BIT3
+
//This could be more accurate.
//Does it ever need to be?
#define SPISPEED 0
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;
return byte;
}
+
//! Enable SPI writing
void spiflash_wrten(){
P5OUT&=~SS; //Drop !SS to begin transaction.
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.
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;
+ //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.
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);
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);
- P5OUT|=SS; //Raise !SS to end transaction.
- txdata(app,verb,len);
+ spiflash_peek(app,verb,len);
break;
+
+
case POKE://Poke up bytes from an SPI Flash ROM.
spiflash_setstatus(0x02);
spiflash_wrten();
while(spiflash_status()&0x01);//while busy
txdata(app,verb,len);
break;
+
+
case SPI_ERASE://Erase the SPI Flash ROM.
spiflash_wrten();
P5OUT&=~SS; //Drop !SS to begin transaction.
P5OUT|=SS; //Raise !SS to end transaction.
txdata(app,verb,0);
break;
+
+
case SETUP:
spisetup();
txdata(app,verb,0);