//This could be more accurate.
//Does it ever need to be?
#define SPISPEED 0
-#define SPIDELAY(x)
-//delay(x)
+#define SPIDELAY(x) delay(x)
//! Set up the pins for SPI mode.
DIRSS;
//Begin a new transaction.
+
CLRSS;
SETSS;
+
}
else
CLRMOSI;
byte <<= 1;
-
+
+ SPIDELAY(100);
SETCLK;
+ SPIDELAY(100);
/* read MISO on trailing edge */
byte |= READMISO;
//debugstr("EM260 is now awake.");
delay(1024); //DO NOT REMOVE, fails without.
}
+//! Handle an EM260 exchange.
+void spi_rw_em260(u8 app, u8 verb, u32 len){
+ static int state=0;
+ unsigned long i;
+ u8 lastin;
+
+ P4DIR=0; //TODO ASAP remove P4 references.
+ P4OUT=0xFF;
+ P4REN=0xFF;
+
+ //See GoodFETEM260.py for details.
+ //The EM260 requires that the host wait for the client.
+
+ /*
+ if((~P4IN)&1)
+ debugstr("Detected HOST_INT.");
+ */
+
+ //if(!state++)
+ //if(state++&1)
+ em260_wake();
+
+ em260woken:
+
+ SETMOSI; //Autodetected SPI mode.
+ CLRSS; //Drop !SS to begin transaction.
+ //Host to slave. Ignore data.
+ for(i=0;i<len;i++){
+ lastin=spitrans8(cmddata[i]);
+ if(lastin!=0xFF){
+ debugstr("Got a byte during transmission. (Shouldn't happen with EM260.)");
+ debughex(lastin);
+ }
+ }
+ //debugstr("Finished transmission to EM260.");
+
+ //Wait for nHOST_INT to drop.
+ i=0xffff;
+
+ /*
+ while(P4IN&1
+ && --i
+ )
+ spitrans8(0xFF);
+ */
+ while((cmddata[0]=spitrans8(0xFF))==0xFF
+ && --i);
+
+ if(!i)
+ debugstr("Gave up on host interrupt.");
+
+ debugstr("Reading response.");
+ len=1;
+ while(
+ (cmddata[len++]=spitrans8(0xFF))!=0xA7
+ );
+ SETSS; //Raise !SS to end transaction.
+
+
+ if(cmddata[0]==0x02){
+ debugstr("Aborted transaction. :(");
+ //goto em260woken;
+ }
+
+ txdata(app,verb,len);
+ return;
+}
//! Handles a monitor command.
void spihandle(unsigned char app,
unsigned char verb,
unsigned long len){
unsigned long i;
- static int state=0;
+
//Raise !SS to end transaction, just in case we forgot.
SETSS;
- spisetup();
+ //spisetup();
switch(verb){
//PEEK and POKE might come later.
break;
case SPI_RW_EM260: //SPI exchange with an EM260
- P4DIR=0; //TODO ASAP remove P4 references.
- P4OUT=0xFF;
- P4REN=0xFF;
-
- //See GoodFETEM260.py for details.
- //The EM260 requires that the host wait for the client.
-
- /*
- if((~P4IN)&1)
- debugstr("Detected HOST_INT.");
- */
-
- //if(!state++)
- //if(state++&1)
- 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.");
-
- //Wait for nHOST_INT to drop.
- i=0xffff;
-
- while(P4IN&1
- && --i
- )
- spitrans8(0xFF);
-
- while((cmddata[0]=spitrans8(0xFF))==0xFF
- && --i);
-
- if(!i)
- debugstr("Gave up on host interrupt.");
-
- len=1;
- while(
- (cmddata[len++]=spitrans8(0xFF))!=0xA7
- );
-
-
- SETSS; //Raise !SS to end transaction.
- txdata(app,verb,len);
+ spi_rw_em260(app,verb,len);
break;
-
case SPI_JEDEC://Grab 3-byte JEDEC ID.
CLRSS; //Drop !SS to begin transaction.
spitrans8(0x9f);