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improved SD-card speed

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This commit is contained in:
Markus Fröschle
2012-12-20 22:08:24 +00:00
parent f0f829ab31
commit c5106fbe91
4 changed files with 44 additions and 10 deletions
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36
sources/sd_card.c
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@@ -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)
{