#include "spi.h"
+//! Handles a monitor command.
+void spi_handle_fn( uint8_t const app,
+ uint8_t const verb,
+ uint32_t const len);
+
+// define the spi app's app_t
+app_t const spi_app = {
+
+ /* app number */
+ SPI,
+
+ /* handle fn */
+ spi_handle_fn,
+
+ /* name */
+ "SPI",
+
+ /* desc */
+ "\tThe SPI app handles the SPI bus protocol, turning\n"
+ "\tyour GoodFET into a USB-to-SPI adapter.\n"
+};
+
//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.
}
-
-//! Handles a monitor command.
-void spihandle(unsigned char app,
- unsigned char verb,
- unsigned long len){
+//! Handle an EM260 exchange.
+void spi_rw_em260(u8 app, u8 verb, u32 len){
unsigned long i;
-
- //Raise !SS to end transaction, just in case we forgot.
- SETSS;
- spisetup();
-
- switch(verb){
- //PEEK and POKE might come later.
- case READ:
- case WRITE:
- CLRSS; //Drop !SS to begin transaction.
- for(i=0;i<len;i++)
- cmddata[i]=spitrans8(cmddata[i]);
- 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;
+ u8 lastin;
+ P4DIR=0; //TODO ASAP remove P4 references.
+ P4OUT=0xFF;
+ //P4REN=0xFF;
- case SPI_JEDEC://Grab 3-byte JEDEC ID.
- 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);
- SETSS; //Raise !SS to end transaction.
- break;
-
- case PEEK://Grab 128 bytes from an SPI Flash ROM
- spiflash_peek(app,verb,len);
- break;
-
-
- case POKE://Poke up bytes from an SPI Flash ROM.
- spiflash_pokeblocks(cmddatalong[0],//adr
- cmddata+4,//buf
- len-4);//len
-
- txdata(app,verb,0);
- break;
-
-
- case SPI_ERASE://Erase the SPI Flash ROM.
- spiflash_wrten();
- CLRSS; //Drop !SS to begin transaction.
- spitrans8(0xC7);//Chip Erase
- SETSS; //Raise !SS to end transaction.
+ //See GoodFETEM260.py for details.
+ //The EM260 requires that the host wait for the client.
+ /*
+ if((~P4IN)&1)
+ debugstr("Detected HOST_INT.");
+ */
- while(spiflash_status()&0x01)//while busy
- PLEDOUT^=PLEDPIN;
- PLEDOUT&=~PLEDPIN;
+ em260_wake();
+
- txdata(app,verb,0);
- break;
-
- case SETUP:
- spisetup();
- txdata(app,verb,0);
- break;
+ 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("EM260 transmission interrupted.");
+ cmddata[0]=lastin;
+ goto response;
+ }
}
+ //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.");
+ response:
+ len=1;
+ while(
+ (cmddata[len++]=spitrans8(0xFF))!=0xA7
+ );
+ if(cmddata[0]==0xFE)
+ while(len<cmddata[1]+3)
+ cmddata[len++]=spitrans8(0xFF);
+ SETSS; //Raise !SS to end transaction.
+
+ txdata(app,verb,len);
+ return;
+}
+
+//! Handles a monitor command.
+void spi_handle_fn( uint8_t const app,
+ uint8_t const verb,
+ uint32_t const len)
+{
+ unsigned long i, l;
+
+ //Raise !SS to end transaction, just in case we forgot.
+ SETSS;
+ //spisetup();
+
+ switch(verb)
+ {
+ case READ:
+ case WRITE:
+ CLRSS; //Drop !SS to begin transaction.
+ for(i=0;i<len;i++)
+ cmddata[i]=spitrans8(cmddata[i]);
+ SETSS; //Raise !SS to end transaction.
+ txdata(app,verb,len);
+ break;
+
+ case SPI_RW_EM260: //SPI exchange with an EM260
+ spi_rw_em260(app,verb,len);
+ break;
+
+ case SPI_JEDEC://Grab 3-byte JEDEC ID.
+ CLRSS; //Drop !SS to begin transaction.
+ spitrans8(0x9f);
+ l=3; //Length is variable in some chips, 3 minimum.
+ for(i = 0; i < l; i++)
+ cmddata[i]=spitrans8(cmddata[i]);
+ txdata(app,verb,len);
+ SETSS; //Raise !SS to end transaction.
+ break;
+
+ case PEEK://Grab 128 bytes from an SPI Flash ROM
+ spiflash_peek(app,verb,len);
+ break;
+
+ case POKE://Poke up bytes from an SPI Flash ROM.
+ spiflash_pokeblocks(cmddatalong[0],//adr
+ cmddata+4,//buf
+ len-4);//len
+ txdata(app,verb,0);
+ break;
+
+ case SPI_ERASE://Erase the SPI Flash ROM.
+ spiflash_wrten();
+ CLRSS; //Drop !SS to begin transaction.
+ spitrans8(0xC7);//Chip Erase
+ SETSS; //Raise !SS to end transaction.
+
+ while(spiflash_status()&0x01)//while busy
+ PLEDOUT^=PLEDPIN;
+ PLEDOUT&=~PLEDPIN;
+
+ txdata(app,verb,0);
+ break;
+
+ case SETUP:
+ spisetup();
+ txdata(app,verb,0);
+ break;
+ }
}
projects / goodfet / blobdiff