usb hostlite fat32 impplementation

Thanks Sir for your kind support

yes,File name is in capital letter .but sir i solved that problem using following change in main_write function

void  Main_Write (void)
{
    SWORD32  fdw;
    SWORD32  fdr;
    UWORD32  tot_bytes_written;
    UWORD32  bytes_written;
    UWORD8            tmp_buf[64]="ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNO";
    UserBuffer = &tmp_buf[0];




        fdw = FILE_Open(FILENAME_W, RDWR);
        if (fdw > 0) {
            tot_bytes_written = 0;

            do {

               // bytes_written = FILE_Write(fdw, UserBuffer, 1024);//earlier
                bytes_written = FILE_Write(fdw, UserBuffer , 64);//now
                tot_bytes_written += bytes_written;
                } while (tot_bytes_written < 1024);
            FILE_Close(fdw);


        }

}

Now i am able to create the file.but a new problem is that when i create file of size upto 0 - 5kb everything is ok.but when I create file of size greater than 8 KB and try to open it on PC.It gives an error

could n,t open L:\MSWRITE.TXT
Make sure a drive in the disk is specified or not

What,s the reason behind it?

Thanks Rohit

Thanks Sir for your kind support

yes,File name is in capital letter .but sir i solved that problem using following change in main_write function

void  Main_Write (void)
{
    SWORD32  fdw;
    SWORD32  fdr;
    UWORD32  tot_bytes_written;
    UWORD32  bytes_written;
    UWORD8            tmp_buf[64]="ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNO";
    UserBuffer = &tmp_buf[0];




        fdw = FILE_Open(FILENAME_W, RDWR);
        if (fdw > 0) {
            tot_bytes_written = 0;

            do {

               // bytes_written = FILE_Write(fdw, UserBuffer, 1024);//earlier
                bytes_written = FILE_Write(fdw, UserBuffer , 64);//now
                tot_bytes_written += bytes_written;
                } while (tot_bytes_written < 1024);
            FILE_Close(fdw);


        }

}

Now i am able to create the file.but a new problem is that when i create file of size upto 0 - 5kb everything is ok.but when I create file of size greater than 8 KB and try to open it on PC.It gives an error

could n,t open L:\MSWRITE.TXT
Make sure a drive in the disk is specified or not

What,s the reason behind it?

Thanks Rohit

Is the buffer passed to FILE_Write() / FILE_Read() placed on the USB RAM (HOST_BASE_ADDR)?

This buffer is directly put into the Transfer Descriptor for DMA by the host controller.
It means the buffer should be placed on the USB RAM.
LPC23xx/24xx families have this restriction on DMA by USB controller.

In the USB host lite example, it manages buffer assignment as follows.

usbhost_lpc2468.c

volatile  HCED        *EDCtrl;        /* Control endpoint descriptor structure                  */
volatile  HCED        *EDBulkIn;      /* BulkIn endpoint descriptor  structure                  */
volatile  HCED        *EDBulkOut;     /* BulkOut endpoint descriptor structure                  */
volatile  HCTD        *TDHead;        /* Head transfer descriptor structure                     */
volatile  HCTD        *TDTail;        /* Tail transfer descriptor structure                     */
volatile  HCCA        *Hcca;          /* Host Controller Communications Area structure          */
          USB_INT16U  *TDBufNonVol;   /* Identical to TDBuffer just to reduce compiler warnings */
volatile  USB_INT08U  *TDBuffer;      /* Current Buffer Pointer of transfer descriptor          */
volatile  USB_INT08U  *FATBuffer;     /* Buffer used by FAT file system                         */
volatile  USB_INT08U  *UserBuffer;    /* Buffer used by application                             */

void  Host_Init (void)
{
    ...
    Hcca       = (volatile  HCCA       *)(HOST_BASE_ADDR+0x000);
    TDHead     = (volatile  HCTD       *)(HOST_BASE_ADDR+0x100);
    TDTail     = (volatile  HCTD       *)(HOST_BASE_ADDR+0x110);
    EDCtrl     = (volatile  HCED       *)(HOST_BASE_ADDR+0x120);
    EDBulkIn   = (volatile  HCED       *)(HOST_BASE_ADDR+0x130);
    EDBulkOut  = (volatile  HCED       *)(HOST_BASE_ADDR+0x140);
    TDBuffer   = (volatile  USB_INT08U *)(HOST_BASE_ADDR+0x150);
    FATBuffer  = (volatile  USB_INT08U *)(HOST_BASE_ADDR+0x1D0);
    UserBuffer = (volatile  USB_INT08U *)(HOST_BASE_ADDR+0x1000);

If the buffer would be placed on the USB RAM, you don't need abuve repeated FILE_Write(). Single FILE_Write() call with whole buffer will do.

Tsuneo

Thanks Sir

No, Sir buffer was not placed on USB RAM.

Thank You so much Sir you solved my problem

you are genuinely a master.