improved SD-card speed

BaS_gcc/Makefile

@@ -70,7 +70,8 @@ CSRCS= \
 	$(SRCDIR)/wait.c \
 	$(SRCDIR)/s19reader.c \
 	$(SRCDIR)/flash.c \
-	$(SRCDIR)/basflash.c
+	$(SRCDIR)/basflash.c \
+	$(SRCDIR)/flash.c
 
 ASRCS= \
 	$(SRCDIR)/startcf.S \

BaS_gcc/sources/flash.c

@@ -51,6 +51,7 @@ void sector_erase(uint8_t *address, uint16_t sector)
 	} while (* (volatile uint32_t *) (address + sector) != 0xffffffff);
 }
 
+
 #ifdef _NOT_USED_
 * MX28LV640DB.alg
 	bra	lab0x5a

BaS_gcc/sources/mmc.c

@@ -26,13 +26,13 @@
 #define	CS_LOW()	{ dspi_fifo_val |= MCF_DSPI_DTFR_CS5; }
 
 #define SPICLK_FAST() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
-					  MCF_DSPI_DCTAR_PCSSCK(0b01) |	/* 3 clock DSPICS to DSPISCK delay prescaler */ \
+					  MCF_DSPI_DCTAR_PCSSCK(0b01) |	/* 1 clock DSPICS to DSPISCK delay prescaler */ \
-					  MCF_DSPI_DCTAR_PASC_3CLK |	/* 3 clock DSPISCK to DSPICS negation prescaler */ \
+					  MCF_DSPI_DCTAR_PASC_1CLK |	/* 1 clock DSPISCK to DSPICS negation prescaler */ \
-					  MCF_DSPI_DCTAR_PDT_3CLK |		/* 3 clock delay between DSPICS assertions prescaler */ \
+					  MCF_DSPI_DCTAR_PDT_1CLK |		/* 1 clock delay between DSPICS assertions prescaler */ \
-					  MCF_DSPI_DCTAR_PBR_1CLK |		/* 1 clock prescaler */ \
+					  MCF_DSPI_DCTAR_PBR_3CLK |		/* 3 clock Baudrate prescaler */ \
-					  MCF_DSPI_DCTAR_ASC(0b1001) |	/* 1024 */ \
+					  MCF_DSPI_DCTAR_ASC(0b0000) |	/* 2 */ \
-					  MCF_DSPI_DCTAR_DT(0b1001) |	/* 1024 */ \
+					  MCF_DSPI_DCTAR_DT(0b0000) |	/* 2 */ \
-					  MCF_DSPI_DCTAR_BR(0b0001); }
+					  MCF_DSPI_DCTAR_BR(0b0000); }	/* clock / 2 */
 
 #define SPICLK_SLOW() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
 					  MCF_DSPI_DCTAR_PCSSCK(0b01) |	/* 3 clock DSPICS to DSPISCK delay prescaler */ \

BaS_gcc/sources/sd_card.c

@@ -28,9 +28,9 @@
 #include <bas_printf.h>
 
 #define WELCOME_NAME	"WELCOME.MSG"
-#define FLASHCODE_NAME	"BASFLASH.BIN"
+#define FLASHCODE_NAME	"BENCH.BIN"
 
-#define FLASHCODE_ADDRESS	0x01000000L
+#define FLASHCODE_ADDRESS	0x03000000L
 
 /*
  * initialize SD-card and FF FAT filesystem routines. Harness to load a file during boot.
@@ -72,6 +72,38 @@ void sd_card_init(void)
 				xprintf("could not open directory \"\\\" on SD-card! Error code: %d\r\n", fres);
 			}
 
+			/*
+			 * let's see if we find our boot flashing executable on disk
+			 */
+			fres = f_open(&file, FLASHCODE_NAME, FA_READ);
+			if (fres == FR_OK)
+			{
+				/*
+				 * yes, load and execute it
+				 *
+				 * FIXME: we will need some kind of user confirmation here
+				 * to avoid unwanted flashing or "bootsector viruses" before going productive
+				 */
+				uint32_t size;	/* length of code piece read */
+				uint32_t total_size = 0L;
+				uint32_t start_time = MCF_SLT_SCNT(0);
+				uint32_t end_time;
+				uint32_t time = 0;
+
+				while ((fres = f_read(&file, (void *) FLASHCODE_ADDRESS, 1024 * 1000, &size)) == FR_OK && size > 0)
+				{
+					total_size += size / 1024;
+					xprintf("read hunk of %d bytes, total_size = %d kBytes\r\n", size, total_size);
+				}
+				end_time = MCF_SLT_SCNT(0);
+				time = (end_time - start_time) / 132L;
+				xprintf("result of f_read: %ld, %ld kbytes read\r\n", fres, total_size);
+				xprintf("time to load %s: %ld s\r\n", FLASHCODE_NAME, time / 1000 / 100);
+				xprintf("equals to about %ld kBytes/second\r\n", total_size / (time / 1000 / 100));
+
+			}
+			f_close(&file);
+
 			fres = f_open(&file, WELCOME_NAME, FA_READ);
 			if (fres == FR_OK)
 			{