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LCDKC6748: write performance on usb pendrive

Paolo Lazzeri
Prodigy 140 points

Hi all,

I'm working on LCDKC6748 and I need to save some log files on a pendrive. The pendrive is connected on the USB OTG port.

My log files are about 30/40 Mbytes, and a lot of time (about 4 minutes) are needed to save them.

Write performance are about 145 KB/s.

I'm using starterware 1.20.04.01.

Do you have any suggestion to speed up the writing process?

Thank you for your help.

Regards,

Paolo

  • 0
    TI__Guru** 116100 points
    Hi,
    Please make sure that DMA support has been enabled in code.
    How did you save the log files in USB, any command or code etc., ?
  • 0 in reply to Titusrathinaraj Stalin
    Prodigy 140 points
    Hi,

    in my project I use the library usblib.lib, available in starterware 1.20.04.01.

    The project related to this library is usblib_c674x_c6748 and it has a predefine symbol DMA_MODE.

    Also my project uses the predefined symbol DMA_MODE.

    To save my log file, I send a command to LCDK via serial port.

    Regards,
    Paolo
  • 0 in reply to Paolo Lazzeri
    TI__Guru** 116100 points
    Hi,
    Thanks for confirming that you have enabled DMA mode.

    To save my log file, I send a command to LCDK via serial port.

    Which command did you send and how ?
    So that I can also reproduce the problem.
  • 0 in reply to Titusrathinaraj Stalin
    Prodigy 140 points
    Hi Titus,

    thank you for your quick reply.

    I wrote a serial protocol to communicate between PC and LCDK. But, in the end, to save the log file I call the f_write() routine in the fat file system available in the Starterware.
    So, In my project I included the fat file system (source code is in C6748_StarterWare_1_20_04_01\third_party\fatfs\src) and fat_usbmsc.c (available in C6748_StarterWare_1_20_04_01\third_party\fatfs\port).
    To mount the pendrive I use the code available in usb_host_msc.c; this file is in C6748_StarterWare_1_20_04_01\examples\lcdkC6748\usb_host_msc.
    The easiest way to reproduce the problem is to work in debug mode, create a buffer in memory and call f_write() to save the file on the pendrive. writing in steps of 512 bytes.

    Regards,
    Paolo
  • 0 in reply to Paolo Lazzeri
    Prodigy 140 points
    No one nave some suggestions? I'm not familiar with USB driver, so it's very difficult for me understand which parte try to modify.
    Thanks in advance,
    Paolo