FatFS测量底层性能方法
http://elm-chan.org/fsw/ff/res/app6.cstatic/image/hrline/4.gif
/*---------------------------------------------------------------------*/
/* Raw Read/Write Throughput Checker */
/*---------------------------------------------------------------------*/
#include <stdio.h>
#include <systimer.h>
#include "diskio.h"
#include "ff.h"
int test_raw_speed (
BYTE pdrv, /* Physical drive number */
DWORD lba, /* Start LBA for read/write test */
DWORD len, /* Number of bytes to read/write (must be multiple of sz_buff) */
void* buff, /* Read/write buffer */
UINT sz_buff /* Size of read/write buffer (must be multiple of FF_MAX_SS) */
)
{
WORD ss;
DWORD ofs, tmr;
#if FF_MIN_SS != FF_MAX_SS
if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) {
printf("\ndisk_ioctl() failed.\n");
return 0;
}
#else
ss = FF_MAX_SS;
#endif
printf("Starting raw write test at sector %lu in %u bytes of data chunks...", lba, sz_buff);
tmr = systimer();
for (ofs = 0; ofs < len / ss; ofs += sz_buff / ss) {
if (disk_write(pdrv, buff, lba + ofs, sz_buff / ss) != RES_OK) {
printf("\ndisk_write() failed.\n");
return 0;
}
}
if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) {
printf("\ndisk_ioctl() failed.\n");
return 0;
}
tmr = systimer() - tmr;
printf("\n%lu bytes written and it took %lu timer ticks.\n", len, tmr);
printf("Starting raw read test at sector %lu in %u bytes of data chunks...", lba, sz_buff);
tmr = systimer();
for (ofs = 0; ofs < len / ss; ofs += sz_buff / ss) {
if (disk_read(pdrv, buff, lba + ofs, sz_buff / ss) != RES_OK) {
printf("\ndisk_read() failed.\n");
return 0;
}
}
tmr = systimer() - tmr;
printf("\n%lu bytes read and it took %lu timer ticks.\n", len, tmr);
printf("Test completed.\n");
return 1;
}
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