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tim239955_stm1_stmicro_com
Associate II
November 10, 2017
Question

Issues using USB MSC Host Libraries

  • November 10, 2017
  • 1 reply
  • 693 views
Posted on November 10, 2017 at 16:28

I have recently added USB support to a product, using the STM32_USB_Host_Library MSC class taken from the STM32Cube_FW_F2_V1.7.0 examples.

We successfully detect devices and write and read from the disk until we get a DISK io error.

Successive calls to either USBH_MSC_Write() or USBH_MSC_Read() fail as the MSC_Handle->unit[lun].state is either in MSC_READ or MSC_WRITE, not MSC_IDLE

Have you any clue how this could occur ?

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    1 reply

    tim239955_stm1_stmicro_com
    tim239955_stm1_stmicro_comAuthor
    Associate II
    November 13, 2017
    Posted on November 13, 2017 at 15:26

    It appears that the interface is in a stalled state - A callback is made to void HAL_HCD_HC_NotifyURBChange_Callback(HCD_HandleTypeDef *hhcd, uint8_t chnum, HCD_URBStateTypeDef urb_state)

    But why would this happen - I am midway through a disk commit hence a complete interface reset would risk disk corruption?

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