//! 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;
+ DIRSS;
//Begin a new transaction.
- P5OUT&=~SS;
- P5OUT|=SS;
+ CLRSS;
+ SETSS;
}
byte |= READMISO;
CLRCLK;
}
-
return byte;
}
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.
}
}
+//! Wake an EM260 Radio
+void em260_wake(){
+ //debugstr("Waking EM260.");
+ #define RST BIT6
+ P2DIR|=RST;
+ SETRST;
+ delay(1024);
+
+ CLRRST;//Wake chip.
+ while(P4IN&1);
+ SETRST;//Woken.
+ //debugstr("EM260 is now awake.");
+ delay(1024); //DO NOT REMOVE, fails without.
+}
+
//! Handles a monitor command.
void spihandle(unsigned char app,
unsigned char verb,
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_RW_EM260: //SPI exchange with an EM260
+ P4DIR=0; //TODO ASAP remove P4 references.
+ P4OUT=0;
+
+ //See GoodFETEM260.py for details.
+ //The EM260 requires that the host wait for the client.
+
+ em260_wake();
+
+ SETMOSI; //Autodetected SPI mode.
+ CLRSS; //Drop !SS to begin transaction.
+ //Host to slave. Ignore data.
+ for(i=0;i<len;i++)
+ spitrans8(cmddata[i]);
+ //debugstr("Finished transmission to EM260.");
+
+ //Could also wait for nHOST_INT to drop.
+ i=0xffff;
+ while((cmddata[0]=spitrans8(0xFF))==0xFF
+ && --i);
+ if(!i)
+ debugstr("Gave up on host interrupt.");
+
+ len=64;
+ for(i=0;i<len;i++)
+ cmddata[i]=spitrans8(0xFF);
+
+
+ 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 PEEK://Grab 128 bytes from an SPI Flash ROM
spiflash_peek(app,verb,len);
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
- P1OUT^=1;
- P1OUT&=~1;
+ PLEDOUT^=PLEDPIN;
+ PLEDOUT&=~PLEDPIN;
txdata(app,verb,0);
break;