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prohorov_leonid
prohorov_leonid
Associate
July 14, 2015
Question

STM32F429I-DISCO USB MSC trouble

  • July 14, 2015
  • 3 replies
  • 951 views
Posted on July 14, 2015 at 13:12

 Hello. I am trying to make USB MSC device on this board with internal RAM disc as storage.

 I am using STM32_USB-Host-Device_Lib_V2.1.0 and i use USB MSC project from that archive as example.

 I have made changes in three files:

  • usb_bsp.c (left only Pin and Interrupt configuring),
  • usbd_storage_msd.c (changed to read/write from 64 Kb array in the internal RAM)
  • usbd_usr.c (removed all board dependent code).
 Now my OS (Windows XP) recognizes the device and asssigns letter to in. But when i try to do something with the disk (even try to open popup menu) my explorer hangs.

 When i see with USB Sniffer (USBTrace) i can see many strange transactions on the bus.

 For example in line 423 (on the attached image) i see BULK OUT transaction to the 81 endpoint, but this endpoint type is IN.

 How can it be? And host makes RESET_PORT regularly after such transactions.

Sorry for my english please.
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    3 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 14, 2015
    Posted on July 14, 2015 at 15:42

    I have posted an MSC SDRAM-DISK example for the STM32F429I-DISCO

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    prohorov_leonid
    prohorov_leonidAuthor
    Associate
    July 15, 2015
    Posted on July 15, 2015 at 07:49

    Yes, i found it, but only .hex file. i have programmed it into board MCU and it works. But it doesn't help me.

     And today i have made some changes. now i am using external SDRAM on the board and i use it as RAM disk. but my problem remains. i found one decision.

     i am changed MSC_BOT_Init function by adding such lines:

      DCD_EP_ClrStall(pdev, MSC_OUT_EP);

     

      DCD_EP_ClrStall(pdev, MSC_IN_EP);

     

     Now sometimes i can format my disk. But work remains unstable.

    prohorov_leonid
    prohorov_leonidAuthor
    Associate
    July 15, 2015
    Posted on July 15, 2015 at 08:43

    oh, i'm so sorry. i found the bug. when i learned how to use this library i added debug information output in usbd_core.c file. and i attemted to write out of debug information array index. now it works fine.

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