Eli Hughes
This program is an example of of using the MSCUSBHost code with a raw build of ELM Chan Fat Fs. This was done to add both Long File Name Support along with proper time/date stamps (assuming you have a battery hooked up to keep time). This code exposes the Chan API (see main.cpp) and is NOT a c++ class: http://elm-chan.org/fsw/ff/00index_e.html The diskio.c file has the mapping needed to link the filesystem to the MSC stuff
Diff: CHAN_FS/diskio.c
- Revision:
- 0:2dbbafe1b1fb
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/CHAN_FS/diskio.c Sun Jan 23 18:35:43 2011 +0000
@@ -0,0 +1,180 @@
+/*-----------------------------------------------------------------------*/
+/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2007 */
+/*-----------------------------------------------------------------------*/
+/* This is a stub disk I/O module that acts as front end of the existing */
+/* disk I/O modules and attach it to FatFs module with common interface. */
+/*-----------------------------------------------------------------------*/
+
+#include "diskio.h"
+#include "usbhost_inc.h"
+#include "mbed.h"
+
+uint32_t _numBlks = 0;
+uint32_t _blkSize = 512;
+
+int initialise_msc();
+void print_inquiry(USB_INT08U *inqReply);
+
+
+int disk_sync() { return 0; }
+int disk_sectors() { return _numBlks; }
+
+DWORD get_fattime(void)
+{
+ time_t CurrentTimeStamp;
+ tm *CurrentLocalTime;
+ DWORD FATFSTimeCode;
+
+ CurrentTimeStamp = time(NULL);
+ CurrentLocalTime = localtime(&CurrentTimeStamp);
+
+ //Map the tm struct time into the FatFs time code
+ FATFSTimeCode = ((CurrentLocalTime->tm_year-80)<<25) |
+ ((CurrentLocalTime->tm_mon+1)<<21) |
+ ((CurrentLocalTime->tm_mday)<<16) |
+ ((CurrentLocalTime->tm_hour)<<11) |
+ ((CurrentLocalTime->tm_min)<<5) |
+ ((CurrentLocalTime->tm_sec));
+
+ return FATFSTimeCode;
+}
+
+DSTATUS disk_status(BYTE Drive)
+{
+ return 0;
+}
+
+
+DRESULT disk_ioctl (
+ BYTE drv, /* Physical drive nmuber (0..) */
+ BYTE ctrl, /* Control code */
+ void *buff /* Buffer to send/receive control data */
+)
+{
+ DRESULT res;
+
+ switch(ctrl)
+ {
+ case CTRL_SYNC:
+ res = RES_OK;
+ break;
+
+ case GET_SECTOR_SIZE:
+ res = RES_OK;
+ *(WORD *)buff = 512;
+ break;
+
+ case GET_SECTOR_COUNT:
+ res = RES_OK;
+ *(DWORD *)buff = (WORD)disk_sectors();
+ break;
+
+ case GET_BLOCK_SIZE:
+ res = RES_OK;
+ *(DWORD *)buff = 1;
+ break;
+
+ default:
+ res = RES_OK;
+ break;
+ }
+ return res;
+}
+
+DSTATUS disk_initialize(BYTE Drive) {
+
+ if ( initialise_msc() != OK )
+ return 1;
+ return 0;
+}
+
+DRESULT disk_write(BYTE Drive,const BYTE * Buffer, DWORD SectorNumber, BYTE SectorCount)
+{
+ if ( OK == MS_BulkSend(SectorNumber, SectorCount, (USB_INT08U *)Buffer) )
+ return RES_OK;
+ return RES_ERROR;
+}
+
+DRESULT disk_read(BYTE Drive, BYTE * Buffer,DWORD SectorNumber, BYTE SectorCount)
+{
+ if ( OK == MS_BulkRecv(SectorNumber, SectorCount, (USB_INT08U *)Buffer) )
+ return RES_OK;
+ return RES_ERROR;
+}
+
+
+
+
+
+void print_inquiry(USB_INT08U *inqReply)
+{
+ // see USB Mass Storage Class � UFI Command Specification,
+ // 4.2 INQUIRY Command
+ printf("Inquiry reply:\n");
+ uint8_t tmp = inqReply[0]&0x1F;
+ printf("Peripheral device type: %02Xh\n", tmp);
+ if ( tmp == 0 )
+ printf("\t- Direct access (floppy)\n");
+ else if ( tmp == 0x1F )
+ printf("\t- none (no FDD connected)\n");
+ else
+ printf("\t- unknown type\n");
+ tmp = inqReply[1] >> 7;
+ printf("Removable Media Bit: %d\n", tmp);
+ tmp = inqReply[2] & 3;
+ printf("ANSI Version: %02Xh\n", tmp);
+ if ( tmp != 0 )
+ printf("\t- warning! must be 0\n");
+ tmp = (inqReply[2]>>3) & 3;
+ printf("ECMA Version: %02Xh\n", tmp);
+ if ( tmp != 0 )
+ printf("\t- warning! should be 0\n");
+ tmp = inqReply[2]>>6;
+ printf("ISO Version: %02Xh\n", tmp);
+ if ( tmp != 0 )
+ printf("\t- warning! should be 0\n");
+ tmp = inqReply[3] & 0xF;
+ printf("Response Data Format: %02Xh\n", tmp);
+ if ( tmp != 1 )
+ printf("\t- warning! should be 1\n");
+ tmp = inqReply[4];
+ printf("Additional length: %02Xh\n", tmp);
+ if ( tmp != 0x1F )
+ printf("\t- warning! should be 1Fh\n");
+ printf("Vendor Information: '%.8s'\n", &inqReply[8]);
+ printf("Product Identification: '%.16s'\n", &inqReply[16]);
+ printf("Product Revision: '%.4s'\n", &inqReply[32]);
+}
+
+
+
+int initialise_msc()
+{
+ USB_INT32S rc;
+ USB_INT08U inquiryResult[INQUIRY_LENGTH];
+
+ //print_clock();
+ Host_Init(); /* Initialize the host controller */
+ rc = Host_EnumDev(); /* Enumerate the device connected */
+ if (rc != OK)
+ {
+ fprintf(stderr, "Could not enumerate device: %d\n", rc);
+ return rc;
+ }
+
+
+ /* Initialize the mass storage and scsi interfaces */
+ rc = MS_Init( &_blkSize, &_numBlks, inquiryResult );
+ if (rc != OK)
+ {
+ fprintf(stderr, "Could not initialize mass storage interface: %d\n", rc);
+ return rc;
+ }
+ printf("Successfully initialized mass storage interface; %d blocks of size %d\n", _numBlks, _blkSize);
+ print_inquiry(inquiryResult);
+ // FATFileSystem supports only 512-byte blocks
+ return _blkSize == 512 ? OK : 1;
+}
+
+
+