FatFS测量底层性能方法

eric2013

http://elm-chan.org/fsw/ff/res/app6.c

1. /*---------------------------------------------------------------------*/
   
2. /* Raw Read/Write Throughput Checker                                   */
   
3. /*---------------------------------------------------------------------*/
   
4. 
   
5. #include <stdio.h>
   
6. #include <systimer.h>
   
7. #include "diskio.h"
   
8. #include "ff.h"
   
9. 
   
10. 
    
11. int test_raw_speed (
    
12.     BYTE pdrv,      /* Physical drive number */
    
13.     DWORD lba,      /* Start LBA for read/write test */
    
14.     DWORD len,      /* Number of bytes to read/write (must be multiple of sz_buff) */
    
15.     void* buff,     /* Read/write buffer */
    
16.     UINT sz_buff    /* Size of read/write buffer (must be multiple of FF_MAX_SS) */
    
17. )
    
18. {
    
19.     WORD ss;
    
20.     DWORD ofs, tmr;
    
21. 
    
22. 
    
23. #if FF_MIN_SS != FF_MAX_SS
    
24.     if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) {
    
25.         printf("\ndisk_ioctl() failed.\n");
    
26.         return 0;
    
27.     }
    
28. #else
    
29.     ss = FF_MAX_SS;
    
30. #endif
    
31. 
    
32.     printf("Starting raw write test at sector %lu in %u bytes of data chunks...", lba, sz_buff);
    
33.     tmr = systimer();
    
34.     for (ofs = 0; ofs < len / ss; ofs += sz_buff / ss) {
    
35.         if (disk_write(pdrv, buff, lba + ofs, sz_buff / ss) != RES_OK) {
    
36.             printf("\ndisk_write() failed.\n");
    
37.             return 0;
    
38.         }
    
39.     }
    
40.     if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) {
    
41.         printf("\ndisk_ioctl() failed.\n");
    
42.         return 0;
    
43.     }
    
44.     tmr = systimer() - tmr;
    
45.     printf("\n%lu bytes written and it took %lu timer ticks.\n", len, tmr);
    
46. 
    
47.     printf("Starting raw read test at sector %lu in %u bytes of data chunks...", lba, sz_buff);
    
48.     tmr = systimer();
    
49.     for (ofs = 0; ofs < len / ss; ofs += sz_buff / ss) {
    
50.         if (disk_read(pdrv, buff, lba + ofs, sz_buff / ss) != RES_OK) {
    
51.             printf("\ndisk_read() failed.\n");
    
52.             return 0;
    
53.         }
    
54.     }
    
55.     tmr = systimer() - tmr;
    
56.     printf("\n%lu bytes read and it took %lu timer ticks.\n", len, tmr);
    
57. 
    
58.     printf("Test completed.\n");
    
59.     return 1;
    
60. }
    

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