CCS/TMS320F28377D: USB write not working

Anish,

Are you able to write anything to the file in the mass storage class? Are you trying to write to flash drive?

sal

Hi Sal, 

Yes I am able to write to the file in the flash drive. It is formatted to Fat as well. 

However It does not write reliably into the file.  It takes 3-5 tries to write some data into it. 

Also could you tell me if it writes upto 4GB in one go ? or do I need to write a fixed byte length and repeat  the process for large files ?

I have attached my code below : 

#define USB_BUFF_SIZE 50
char usb_buffer[USB_BUFF_SIZE] = {0};


uint16_t
Write_usb_master(void)
{
  static uint16_t usb_local_flag = FLG_BUSY ;
  static uint16_t usb_status = USB_W_OPEN;
  static uint16_t flg;
  char usb_file_name[50] = "info.txt";

  static uint16_t num_byte_written = 0;

  uint16_t flag = 0;


  f_open(&g_sFileObject, usb_file_name, FA_WRITE);

  usb_buffer[0] = '1';
  usb_buffer[1] = '2';
  usb_buffer[2] = '3';
  usb_buffer[3] = '4';
  usb_buffer[4] = '5';
  usb_buffer[5] = '6';
  usb_buffer[6] = '7';
  usb_buffer[7] = '8';
  usb_buffer[8] = '9';
  usb_buffer[9] = '0';

  usb_buffer[10] = '1';
  usb_buffer[11] = '2';
  usb_buffer[12] = '3';
  usb_buffer[13] = '4';
  usb_buffer[14] = '5';
  usb_buffer[15] = '6';
  usb_buffer[16] = '7';
  usb_buffer[17] = '8';
  usb_buffer[18] = '9';

  Write_usb_file(usb_buffer , USB_BUFF_SIZE , &num_byte_written);
}

uint16_t
Write_usb_file(char usb_data[] ,
               uint16_t USB_BS,
               uint16_t *usBytesWritten)
{
  FRESULT fresult;
  static uint16_t ruf_cmpt = FLG_BUSY;


  fresult = f_write(&g_sFileObject, usb_data, (WORD)(USB_BS), (WORD*)(usBytesWritten));

  /* If there was an error reading, then print a newline and return the error to the user */
  if(fresult != FR_OK)
  {
    ruf_cmpt = FLG_ERROR;
  }
  else
  {
    ruf_cmpt = FLG_CMPT;
    f_close(&g_sFileObject);
  }
  return ruf_cmpt;
}

Anish

Hi Anish,

Currently I cannot dig into this much right now. Unfortunately, I am the owner of USB and am not very familiar with this example and use case since not many customers use USB this way.

I may have some time to look at it in a week or so. Please ping back then if you are still having issues.

Until then, if you have more specific questions regarding the USB protocol or USBlib, I may be of assistance.

Sorry for any inconvenience.
sal

Hi Sal ,
Is there any example project which you may have for writing into a file in a mass storage device which I may be able to refer to ?

Regards
Anish

There is the usb_host_msc example.

Are you using this already? If not, it will be helpful. We want to add support for this example in the future.

sal

Hi Sal,

Yes I am using this example to read and write . I am able to read . Its just writing which I am not sure of .
Please have a look whenever you get the time and let me know what the issue may be.

Anish

Hi Sal , I'm still not sure how to write reliably to the USB . Would you be able to have a look at it .

Regards
Anish

Unfortunately, we do not have a schedule to look into this yet. I have filed a bug for us to address this.

sal