dual sramc

This driver allows you to run two SRAMC devices side-by-side as two
separate rdisk devices.

sys/kernel/rdisk.c

@@ -69,10 +69,14 @@ const struct diskentry disks[] = {
 	{sd_preinit, sdinit, sddeinit, sdopen, sdsize, card_read, card_write, 1, RD_DEFAULT},
 #endif
 
-#ifdef SRAMC_ENABLED
+#ifdef SRAMC0_ENABLED
 	{sramc_init, no_init, no_deinit, sramc_open, sramc_size, sramc_read, sramc_write, 0, RD_PREPART},
 #endif
 
+#ifdef SRAMC1_ENABLED
+	{sramc_init, no_init, no_deinit, sramc_open, sramc_size, sramc_read, sramc_write, 1, RD_PREPART},
+#endif
+
 #ifdef SDRAMP_ENABLED
 	{sdramp_preinit, no_init, no_deinit, sdramp_open, sdramp_size, sdramp_read, sdramp_write, 0, RD_PREPART},
 #endif	
@@ -576,100 +580,116 @@ struct buf *prepartition_device(char *devname)
 	int pnum = 0;
 	int start = 2;
 	char dev[9];
-	char size[9];
+	int size;
-	char type[5];
+    int devsize = 0;
-	int pos = 0;
+    char *ptdata = NULL;
 
-	p = prepartition_schema+1;
+    char *ppstart = prepartition_schema;
-	q = p;
+
+    while (*ppstart == '(') {
+        ppstart++;
+    }
 
 	printf("PP Schema: %s\n",prepartition_schema);
 
+    printf("Attempting partition of %s...\n", devname);
+
+    // Let's get the devname into the "dev" variable and append a ":" on the end of it.
+    q = dev;
+    for (p=devname; *p; p++) {
+        *q = *p;
+        q++;
+        devsize++;
+    }
+    *q++ = ':';
+    *q = 0;
+    devsize++;
+
+    printf("%%DBG-PPT: Device Name: %s (%d chars)\n", dev, devsize);
+
+    // Now we want to scan the string to find the device name.  It has to either
+    // be at the start of the string or be prefixed by a ' '
+    for (p = ppstart; *(p+devsize); p++) {
+        if (strncmp(p, dev, devsize) == 0) {
+            printf("%%DBG-PPT: Device found.\n");
+            ptdata = p + devsize;
+            break;
+        }
+    }
+    if (ptdata == NULL) {
+        printf("%%DBG-PPT: Device not in partition schema\n");
+        return NULL;
+    }
+    
+
+    // We must have a pointer to the start of the partition data in ptdata now.
+    // Now to scan through it and get the data into the structures.
+        
+    printf("%%DBG-PPT: We now like this bit: %s\n", ptdata);
+    
 	bp = getnewbuf();
-	if(!bp)
+	if(!bp) {
-	{
+        printf("%%DBG-PPT: Unable to allocate buffer!\n");
 		return NULL;
 	}
 
 	mbr = (struct mbr *)bp->b_addr;
 
-	while(*p)
+    // Ok, let's scan through the data one character at a time until we hit either a 
-	{
+    // space or a close-bracket (indicating the end of the data).
-		while(*q && *q != ' ')
-			q++;
-		if(*q == ' ')
-		{
-			*q = 0;
-			q++;
-		}
 
-		pos = 0;
+    p = ptdata;
-		while((*p) && (*p != ':'))
+    pnum = 0;
-		{
+    while ((*p != ' ') && (*p != ')')) {
-			dev[pos++] = *p;
+        // First let's look to see if we have a valid partition type - it's 2 characters
-			dev[pos] = 0;
+        // followed by an '@'.
-			p++;
-		}
 
-		if((*p) == ':')
+        printf("%%DBG-PPT: Looking at: %s\n", p);
-		{
-			p++;
-		} else {
-			printf("Device Format Error (%c)\n",*p);
-			brelse(bp);
-			return NULL;
-		}
 
-		while((*p) && (*p != ' '))
+        // Active swap space
-		{
+        if (strncmp(p, "sa@", 3) == 0) {
-			pos = 0;
+            mbr->partitions[pnum].type=RDISK_SWAP;
-			while((*p) && (*p != '@'))
+            mbr->partitions[pnum].status = 0x80;
-			{
+        } else
-				type[pos++] = *p;
-				type[pos] = 0;
-				p++;
-			}
 
-			if((*p) == '@')
+        // Inactive swap space
-			{
+        if (strncmp(p, "sw@", 3) == 0) {
-				p++;
+            mbr->partitions[pnum].type=RDISK_SWAP;
-			} else {
+        } else
-				printf("Type Format Error\n");
-				brelse(bp);
-				return NULL;
-			}
 
-			pos = 0;
+        // General UFS filesystem
-			while((*p) && (*p != ',') && (*p != ' ') && (*p != ')'))
+        if (strncmp(p, "fs@", 3) == 0) {
-			{
+            mbr->partitions[pnum].type=RDISK_FS;
-				size[pos++] = *p;
+        } else {
-				size[pos] = 0;
+            printf("%%DBG-PPT: Error parsing partition data: %s\n", p);
-				p++;
+            brelse(bp);
-			}
+            return NULL;
+        }
 
-			printf("Found partition on %s of type %s and size %s\n",
+        p+=3;
-				dev,type,size);
 
-			if(!strcmp(dev,devname))
+        size = 0;
-			{
+        while ((*p >= '0') && (*p <= '9')) {
-				if(!strcmp("sw",type))
+            size *= 10;
-					mbr->partitions[pnum].type=RDISK_SWAP;
+            size += *p - '0';
-				if(!strcmp("sa",type))
+            p++;
-				{
+        }
-					mbr->partitions[pnum].type=RDISK_SWAP;
-					mbr->partitions[pnum].status = 0x80;
-				}
-				if(!strcmp("fs",type))
-					mbr->partitions[pnum].type=RDISK_FS;
 
-				mbr->partitions[pnum].lbastart = start;
+        mbr->partitions[pnum].lbastart = start;
-				mbr->partitions[pnum].lbalength = atoi(size)<<1;
+        mbr->partitions[pnum].lbalength = size << 1;
-				start += mbr->partitions[pnum].lbalength;
+
-				pnum++;
+        printf("%%DBG-PPT: Added partition %d type %d size %d at offset %d\n", 
-			}
+            pnum,
-			p++;
+            mbr->partitions[pnum].type,
-		}
+            mbr->partitions[pnum].lbalength,
-	}
+            mbr->partitions[pnum].lbastart
+        );
+        start += (size << 1);
+        pnum++;
+        if (*p == ',') {
+            p++;
+        }
+    }
 	
 	if(pnum > 0)
 	{

sys/pic32/cfg/sramc.dev

@@ -2,6 +2,7 @@ always
     file rd_sramc.o
     require rdisk
     define SRAMC_ENABLED YES
+    define SRAMC%0_ENABLED YES
 end always
 
 option data

sys/pic32/fubarino/Makefile

@@ -6,7 +6,7 @@ S         = ../../../tools/configsys/../../sys/kernel
 vpath %.c $(M):$(S)
 vpath %.S $(M):$(S)
 
-KERNOBJ += _startup.o adc.o clock.o cons.o devsw.o exception.o glcd.o gpio.o init_main.o init_sysent.o kern_clock.o kern_descrip.o kern_exec.o kern_exit.o kern_fork.o kern_mman.o kern_proc.o kern_prot.o kern_prot2.o kern_resource.o kern_sig.o kern_sig2.o kern_subr.o kern_synch.o kern_sysctl.o kern_time.o machdep.o mem.o oc.o rd_sd.o rdisk.o signal.o spi_bus.o subr_prf.o subr_rmap.o swap.o sys_generic.o sys_inode.o sys_pipe.o sys_process.o syscalls.o sysctl.o tty.o tty_subr.o tty_tty.o ufs_alloc.o ufs_bio.o ufs_bmap.o ufs_dsort.o ufs_fio.o ufs_inode.o ufs_mount.o ufs_namei.o ufs_subr.o ufs_syscalls.o ufs_syscalls2.o usb_device.o usb_function_cdc.o usb_uart.o vers.o vfs_vnops.o vm_sched.o vm_swap.o vm_swp.o 
+KERNOBJ += _startup.o adc.o clock.o cons.o devsw.o exception.o gpio.o init_main.o init_sysent.o kern_clock.o kern_descrip.o kern_exec.o kern_exit.o kern_fork.o kern_mman.o kern_proc.o kern_prot.o kern_prot2.o kern_resource.o kern_sig.o kern_sig2.o kern_subr.o kern_synch.o kern_sysctl.o kern_time.o machdep.o mem.o oc.o rd_sd.o rd_sramc.o rdisk.o signal.o spi.o spi_bus.o subr_prf.o subr_rmap.o swap.o sys_generic.o sys_inode.o sys_pipe.o sys_process.o syscalls.o sysctl.o tty.o tty_subr.o tty_tty.o uart.o ufs_alloc.o ufs_bio.o ufs_bmap.o ufs_dsort.o ufs_fio.o ufs_inode.o ufs_mount.o ufs_namei.o ufs_subr.o ufs_syscalls.o ufs_syscalls2.o vers.o vfs_vnops.o vm_sched.o vm_swap.o vm_swp.o 
 EXTRA_TARGETS = bootloader 
 
 DEFS += -DADC_ENABLED=YES
@@ -16,11 +16,11 @@ DEFS += -DBL_CRYSTAL=8
 DEFS += -DBL_LED_PIN=5
 DEFS += -DBL_LED_PORT=TRISE
 DEFS += -DBUS_DIV=1
-DEFS += -DBUS_KHZ=80000
+DEFS += -DBUS_KHZ=120000
-DEFS += -DCONSOLE_DEVICE=ttyUSB0
+DEFS += -DCONSOLE_DEVICE=tty1
-DEFS += -DCPU_IDIV=2
+DEFS += -DCPU_IDIV=1
-DEFS += -DCPU_KHZ=80000
+DEFS += -DCPU_KHZ=120000
-DEFS += -DCPU_MUL=20
+DEFS += -DCPU_MUL=15
 DEFS += -DCPU_ODIV=1
 DEFS += -DCRYSTAL=8
 DEFS += -DDC0_DEBUG=DEVCFG0_DEBUG_DISABLED
@@ -35,8 +35,8 @@ DEFS += -DDC1_POSCMOD=DEVCFG1_POSCMOD_HS
 DEFS += -DDC1_SOSC=0
 DEFS += -DDC1_WDTEN=0
 DEFS += -DDC1_WDTPS=DEVCFG1_WDTPS_1
-DEFS += -DDC2_PLLIDIV=DEVCFG2_FPLLIDIV_2
+DEFS += -DDC2_PLLIDIV=DEVCFG2_FPLLIDIV_1
-DEFS += -DDC2_PLLMUL=DEVCFG2_FPLLMUL_20
+DEFS += -DDC2_PLLMUL=DEVCFG2_FPLLMUL_15
 DEFS += -DDC2_PLLODIV=DEVCFG2_FPLLODIV_1
 DEFS += -DDC2_UPLL=0
 DEFS += -DDC2_UPLLIDIV=DEVCFG2_UPLLIDIV_2
@@ -48,7 +48,6 @@ DEFS += -DDC3_USBID=DEVCFG3_FUSBIDIO
 DEFS += -DDC3_USERID=0xffff
 DEFS += -DDC3_VBUSON=DEVCFG3_FVBUSONIO
 DEFS += -DFLASH_JUMP=0x9d000000
-DEFS += -DGLCD_ENABLED=YES
 DEFS += -DGPIO_ENABLED=YES
 DEFS += -DHID_FEATURE_REPORT_BYTES=2
 DEFS += -DHID_INPUT_REPORT_BYTES=2
@@ -56,24 +55,36 @@ DEFS += -DHID_INT_IN_EP_SIZE=64
 DEFS += -DHID_INT_OUT_EP_SIZE=64
 DEFS += -DHID_OUTPUT_REPORT_BYTES=2
 DEFS += -DHID_RPT01_SIZE=29
+DEFS += -DHZ=1000
 DEFS += -DKERNEL
 DEFS += -DLED_KERNEL_PIN=5
 DEFS += -DLED_KERNEL_PORT=TRISE
+DEFS += -DNBUF=8
+DEFS += -DNMOUNT=3
+DEFS += -DNPROC=25
 DEFS += -DOC_ENABLED=YES
+DEFS += -DPARTITION="sramc0:sa@2048,fs@6140"
 DEFS += -DPIC32MX7
 DEFS += -DSD0_CS_PIN=9
 DEFS += -DSD0_CS_PORT=TRISG
+DEFS += -DSD0_MHZ=20
 DEFS += -DSD0_PORT=2
-DEFS += -DUARTUSB_ENABLED=YES
+DEFS += -DSPI_ENABLED=YES
+DEFS += -DSRAMC0_ENABLED=YES
+DEFS += -DSRAMC_ENABLED=YES
+DEFS += -DUART1_BAUD=115200
+DEFS += -DUART1_ENABLED=YES
+DEFS += -DUART2_BAUD=115200
+DEFS += -DUART2_ENABLED=YES
 DEFS += -DUCB_METER
 DEFS += -DUSB_EP0_BUFF_SIZE=8
-DEFS += -DUSB_MAX_EP_NUMBER=3
+DEFS += -DUSB_MAX_EP_NUMBER=1
 DEFS += -DUSB_NUM_STRING_DESCRIPTORS=3
 
 
 LDSCRIPT = ../../../tools/configsys/../../sys/pic32/cfg/bootloader.ld
 
-CONFIG = FUBARINO
+CONFIG = FUBARINO-UART2CONS-UART1-SRAMC
 CONFIGPATH = ../../../tools/configsys
 
 include ../../../tools/configsys/../../sys/pic32/kernel-post.mk

sys/pic32/rd_sramc.c

@@ -3,6 +3,7 @@
  *
  * This version is for 8MB RAMDISK v.1.1 and compatible
  * Pito 7.4.2014 - PIC32MX PMP bus version
+ * Pito 28.4.2014 - Mod for 2 Units
  * Under by retrobsd.org used Licence
  * No warranties of any kind
  *
@@ -29,23 +30,29 @@
 
 int sw_dkn = -1;                /* Statistics slot number */
 
-// Ramdisk v.1.1. wiring
+// 8MB Ramdisk v.1.1. wiring
 // PMP         RAMDISK
 // ===================
 // PMD<D0-D7>  D0-D7
 // PMRD        /RD
 // PMWR        /WR
 // PMA<0>      /DATA
+// PMA<1>      0-Unit0
+// PMA<10>     0-Unit1
+
+//#define NDATA (1<<0)
+//#define UNIT0 (1<<1)
+//#define UNIT1 (1<<10)
 
 // RD and WR pulses duration settings
 // Minimal recommended settings, increase them when unstable
 // No warranties of any kind
-// for 120MHz clock, 70ns PSRAM, Ramdisk v.1.1.
+// for 120MHz clock, 70ns PSRAM, 8MB Ramdisk v.1.1.
 #define ADR_PULSE  1
 #define WR_PULSE   5
 #define RD_PULSE   11
 
-// for 80MHz clock, 70ns PSRAM, Ramdisk v.1.1.
+// for 80MHz clock, 70ns PSRAM, 8MB Ramdisk v.1.1.
 //#define ADR_PULSE 1
 //#define WR_PULSE 3
 //#define RD_PULSE 8
@@ -61,35 +68,31 @@ int sw_dkn = -1;                /* Statistics slot number */
 //#define RD_PULSE 4
 
 typedef union {
-	unsigned value;
+	unsigned int value;
 	struct {
-unsigned nib1: 4;  // lowest nibble
+        unsigned nib1: 4;  // lowest nibble
-unsigned nib2: 4;
+        unsigned nib2: 4;
-unsigned nib3: 4;
+        unsigned nib3: 4;
-unsigned nib4: 4;
+        unsigned nib4: 4;
-unsigned nib5: 4;
+        unsigned nib5: 4;
-unsigned nib6: 4;
+        unsigned nib6: 4;
-unsigned nib7: 4;
+        unsigned nib7: 4;
-unsigned nib8: 4;  // highest nibble
+        unsigned nib8: 4;  // highest nibble
 	};
-} nybbles ;
+} nybbles;
 
 
 /*
  * Load the 24 bit address to Ramdisk.
  * 
  */
-inline static void
+inline static void dev_load_address (unsigned int addr)
-dev_load_address (addr)
-        unsigned addr;
 {
 	    nybbles temp;
 	    temp.value = addr;
 
         while(PMMODE & 0x8000);  // Poll - if busy, wait
 
-        PMADDR = 1;  // set ADR mode (1) to write the Address
-
         PMMODE = 0b10<<8 | (ADR_PULSE<<2);  // full ADR speed
 
         PMDIN = temp.nib6;           /* write 4 bits */
@@ -108,7 +111,6 @@ dev_load_address (addr)
 
         while(PMMODE & 0x8000);  // Poll - if busy, wait
         PMDIN = temp.nib1;           /* write 4 bits */
-
 }
 
 /*
@@ -117,64 +119,82 @@ dev_load_address (addr)
  */
 int sramc_size ( int unit )
 {
-	return 8192;  // 4096 for 4MB ramdisk
+    int srsize;
+
+    switch (unit) {
+        case 0: srsize = 8192; break;
+        case 1: srsize = 8192; break;
+        }
+	return srsize;
 }
 
 /*
  * Read a block of data.
  */
-inline int sramc_read (int unit, unsigned int blockno, char *data, unsigned int nbytes)
+inline int sramc_read (int unit, unsigned int blockno, register char *data, register unsigned int nbytes)
 {
-	int i;
 
-	//DEBUG9("sramc%d: read block %u, length %u bytes, addr %p\n",
+//printf("sramc%d: rd blockno %u, nbytes %u, addr %p\n", unit, blockno, nbytes, data);
-	//	major(dev), blockno, nbytes, data);
-
-	dev_load_address (blockno * DEV_BSIZE);
-
-    /* Read data. */
 
     while(PMMODE & 0x8000); // Poll - if busy, wait
 
-    PMADDR = 0; // set DATA mode (0)    
+    switch (unit) {
+        // set Unit address and ADDRESS mode (1)
+        case 0: PMADDR = 0b10000000001;  break;
+        case 1: PMADDR = 0b00000000011;  break;
+        } 
+
+	dev_load_address (blockno * DEV_BSIZE);
+
+    while(PMMODE & 0x8000); // Poll - if busy, wait
 
     PMMODE = 0b10<<8 | (RD_PULSE<<2);  // read slowly
 
+    PMADDR = PMADDR & 0b10000000010; // set DATA mode
+    
     PMDIN; // Read the PMDIN to clear previous data and latch new data
         
-        for (i=0; i<nbytes; i++) {
+    while (nbytes--) {
-                while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+                    while(PMMODE & 0x8000); // Poll - if busy, wait before reading
-                *data++ = PMDIN;   /* read a byte of data */
+                    *data++ = PMDIN;   /* read a byte of data */
-        }
+                    }   
     
+    while(PMMODE & 0x8000); // Poll - if busy, wait    
+    PMADDR = 0b10000000011; // deselect             
 	return 1;
 }
 
 /*
  * Write a block of data.
  */
-inline int sramc_write (int unit, unsigned int blockno, char *data, unsigned int nbytes)
+inline int sramc_write (int unit, unsigned int blockno, register char *data, register unsigned int nbytes)
 {
-	unsigned i;
 
-	//DEBUG9("sramc%d: write block %u, length %u bytes, addr %p\n",
+//printf("sramc%d: wr blockno %u, nbytes %u , addr %p\n", unit, blockno, nbytes, data);
-	//	major(dev), blockno, nbytes, data);
+
+    while(PMMODE & 0x8000); // Poll - if busy, wait
+
+    switch (unit) {
+        // set Unit address and ADDRESS mode (1)
+        case 0: PMADDR = 0b10000000001;  break;
+        case 1: PMADDR = 0b00000000011;  break;
+        }
 
     dev_load_address (blockno * DEV_BSIZE);
 
-    /* Write data. */
-
     while (PMMODE & 0x8000); // Poll - if busy, wait
 
-    PMADDR = 0; // set DATA mode (0)
-
     PMMODE = 0b10<<8 | (WR_PULSE<<2);  // faster with write
 
-        for (i=0; i<nbytes; i++) {
+    PMADDR = PMADDR & 0b10000000010; // set DATA mode
-                while(PMMODE & 0x8000);  // Poll - if busy, wait
-                PMDIN = (*data++);       /* write a byte of data */
-        }
 
+        while(nbytes--) {
+                    while(PMMODE & 0x8000);  // Poll - if busy, wait
+                    PMDIN = (*data++);   /* write a byte of data*/ 
+                    }
+
+    while(PMMODE & 0x8000); // Poll - if busy, wait
+    PMADDR = 0b10000000011; // deselect
 	return 1;
 }
 
@@ -184,6 +204,8 @@ inline int sramc_write (int unit, unsigned int blockno, char *data, unsigned int
  */
 void sramc_init (int unit)
 {
+
+ //   printf("ramdisk%d: init\n",unit);
 	struct buf *bp;
 	
     // Initialize PMP hardware
@@ -196,31 +218,50 @@ void sramc_init (int unit)
     //         MODE      WAITB     WAITM    WAITE
     PMMODE =  0b10<<8  |    0   | (14<<2) | 0    ; // Mode2 Master 8bit
 
-    PMAEN = 1;  // PMA<0>, use A0 only
+    PMAEN = 0b10000000011;  // PMA<>, use A10,A1,A0
 
-    PMADDR = 0;  // start with DATA mode
+    PMADDR = 0b10000000010;  // start with DATA mode
 
     PMCONSET = 1<<15;   // PMP enabled       
     asm volatile ("nop"); 
 
     // make a couple of dummy reads - it refreshes the cpld internals a little bit :)
-    while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+    switch (unit) {
-    PMDIN;   /* read a byte of data */
-    while(PMMODE & 0x8000); // Poll - if busy, wait before reading
-    PMDIN;   /* read a byte of data */
     
-    PMADDR = 1;  // go with with ADDRESS mode now
+    case 0: PMADDR = 0b10000000000;  // start with DATA mode
+            while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+            PMDIN;   /* read a byte of data */
+            while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+            PMDIN;   /* read a byte of data */
         
+            bp = prepartition_device("sramc0");
 
-	DEBUG3("sramc%d: init done\n",unit);
+            if(bp) {
-        bp = prepartition_device("sramc0");
-        if(bp)
-        {
                 sramc_write(0, 0, bp->b_addr, 512);
                 brelse(bp);
-        }
+            }
+           // printf("sramc%d: init done\n",unit);
+            break;
 
-	return;
+
+    case 1: PMADDR = 0b00000000010;  // start with DATA mode
+            while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+            PMDIN;   /* read a byte of data */
+            while(PMMODE & 0x8000); // Poll - if busy, wait before reading
+            PMDIN;   /* read a byte of data */
+        
+            bp = prepartition_device("sramc1");
+
+            if(bp) {
+                sramc_write(1, 0, bp->b_addr, 512);
+                brelse(bp);
+            }
+           // printf("sramc%d: init done\n",unit);
+            break;
+    }
+
+    while(PMMODE & 0x8000); // Poll - if busy, wait
+    PMADDR = 0b10000000011;  // go with with ADDRESS mode
 }
 
 /*
@@ -228,6 +269,6 @@ void sramc_init (int unit)
  */
 int sramc_open (int unit)
 {
-	DEBUG3("sramc%d: open\n",unit);
+    // printf("sramc%d: open done\n",unit);
 	return 0;
 }

sys/pic32/spi_bus.c

@@ -44,12 +44,16 @@ int spi_open(unsigned int bus, unsigned int *tris, unsigned int pin)
         case 2:
             spi_devices[dno].bus = (struct spireg *)&SPI2CON;
             break;
+#ifdef SPI3CON
         case 3:
             spi_devices[dno].bus = (struct spireg *)&SPI3CON;
             break;
+#endif
+#ifdef SPI4CON
         case 4:
             spi_devices[dno].bus = (struct spireg *)&SPI4CON;
             break;
+#endif
         default:
             return -1;
     }
@@ -624,11 +628,14 @@ char *spi_name(int dno)
     if(spi_devices[dno].bus == (struct spireg *)&SPI2CON)
         return "SPI2";
 
+#ifdef SPI3CON
     if(spi_devices[dno].bus == (struct spireg *)&SPI3CON)
         return "SPI3";
-
+#endif
+#ifdef SPI4CON
     if(spi_devices[dno].bus == (struct spireg *)&SPI4CON)
         return "SPI4";
+#endif
 
     return "SPI?";
 }