//! 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.
//This function came from the SPI Wikipedia article.
//Minor alterations.
- P5OUT&=~SS;
-
for (bit = 0; bit < 8; bit++) {
/* write MOSI on trailing edge of previous clock */
if (byte & 0x80)
CLRCLK;
}
- P5OUT|=SS;
-
return byte;
}
+//! Enable SPI writing
+void spiflash_wrten(){
+ P5OUT&=~SS; //Drop !SS to begin transaction.
+ spitrans8(0x06);//Chip Erase
+ P5OUT|=SS; //Raise !SS to end transaction.
+}
+
//! Handles a monitor command.
void spihandle(unsigned char app,
unsigned char verb,
unsigned char len){
+ unsigned char i;
switch(verb){
//PEEK and POKE might come later.
case READ:
case WRITE:
- cmddata[0]=spitrans8(cmddata[0]);
- txdata(app,verb,1);
+ 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.
+
+ 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();