//! Set up the pins for SPI mode.
void spisetup(){
- P5OUT|=SS;
- P5DIR|=MOSI+SCK+SS;
+ SETSS;
+ P5DIR|=MOSI+SCK+BIT0; //BIT0 might be SS
P5DIR&=~MISO;
//Begin a new transaction.
- P5OUT&=~SS;
- P5OUT|=SS;
+ CLRSS;
+ SETSS;
}
void spiflash_wrten(){
SETSS;
/*
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x04);//Write Disable
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //Raise !SS to end transaction.
*/
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x06);//Write Enable
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //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.
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ SETSS; //Raise !SS to end transaction.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x05);//GET STATUS
c=spitrans8(0xFF);
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //Raise !SS to end transaction.
return c;
}
unsigned char verb,
unsigned long len){
unsigned int i;
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x03);//Flash Read Command
len=3;//write 3 byte pointer
for(i=0;i<len;i++)
while(len--)
serial_tx(spitrans8(0));
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //Raise !SS to end transaction.
}
unsigned long i;
//Raise !SS to end transaction, just in case we forgot.
- P5OUT|=SS;
+ SETSS;
spisetup();
switch(verb){
//PEEK and POKE might come later.
case READ:
case WRITE:
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ CLRSS; //Drop !SS to begin transaction.
for(i=0;i<len;i++)
cmddata[i]=spitrans8(cmddata[i]);
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //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.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0x9f);
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);
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //Raise !SS to end transaction.
break;
case SPI_ERASE://Erase the SPI Flash ROM.
spiflash_wrten();
- P5OUT&=~SS; //Drop !SS to begin transaction.
+ CLRSS; //Drop !SS to begin transaction.
spitrans8(0xC7);//Chip Erase
- P5OUT|=SS; //Raise !SS to end transaction.
+ SETSS; //Raise !SS to end transaction.
while(spiflash_status()&0x01)//while busy