P5OUT|=SS;
P5DIR|=MOSI+SCK+SS;
P5DIR&=~MISO;
+
+ //Begin a new transaction.
+ P5OUT&=~SS;
+ P5OUT|=SS;
}
//! Read and write an SPI bit.
//! 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);
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.
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:
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.
+
+ spiflash_peek(app,verb,len);
break;
case POKE://Poke up bytes from an SPI Flash ROM.
spiflash_setstatus(0x02);
//First three bytes are address, then data.
for(i=0;i<len;i++)
spitrans8(cmddata[i]);
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ P5OUT|=SS; //Raise !SS to end transaction.
while(spiflash_status()&0x01);//while busy
- spiflash_wrten();
txdata(app,verb,len);
break;
case SPI_ERASE://Erase the SPI Flash ROM.
txdata(app,verb,0);
break;
}
+
}