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Detection of "Safely remove hardware" was used

Gunnar Bohlen

Hello,

we use the RTX RTOS and USB MSD function to get access to an internal eMMC/SD card  that is connected to a Corex M7 CPU.

When the user does a "Safely remove hardware" on the PC: is it possible to detect this event in the microcontroller firmware?

When I do this for a standard USB-Stick, the device is removed and is not visible as a drive anymore.

If I do this for the drive of my embedded eMMC, Windows tells me that I can now safely remove the device, but the drive is still present and I can access it. So I assume that windows sends something like a "stop" command to the drive, and I need to do something in the firmware when I receive this. Is there a function that I can use to check that status?

Regards

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  • 0 in reply to Milorad Cvjetkovic

    Hello Milorad,

    I think the changes are very generic and backwards compatible. Not sure if it covers all possible cases...
    Changes in usbd_lib_msc.c 

    Changes in USBD_User_MSC_0.c

    Usage: once USB  MSD is initialized and ownership is set to USB, the firmware checks cyclic:

    for(;;) {
    uint32_t mediastatus;
    osDelay(100);
    mediastatus=USBD_MSC0_CheckMedia(); // blockierende funktion!!!
			if(mediastatus==0) {
				printf("media status: %d\n",mediastatus);
				USBD_Disconnect(0);
				osDelay(20);
				USBD_Uninitialize(0U);
}

    The function USB_MSC_Medium_Is_Stopped()==1
    I use to switch off some LEDs in case the device is stopped.

    Regards

    Gunnar Bohlen
    HMS-Networks

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  • 0 in reply to Milorad Cvjetkovic

    Hello Milorad,

    I think the changes are very generic and backwards compatible. Not sure if it covers all possible cases...
    Changes in usbd_lib_msc.c 

    Changes in USBD_User_MSC_0.c

    Usage: once USB  MSD is initialized and ownership is set to USB, the firmware checks cyclic:

    for(;;) {
    uint32_t mediastatus;
    osDelay(100);
    mediastatus=USBD_MSC0_CheckMedia(); // blockierende funktion!!!
			if(mediastatus==0) {
				printf("media status: %d\n",mediastatus);
				USBD_Disconnect(0);
				osDelay(20);
				USBD_Uninitialize(0U);
}

    The function USB_MSC_Medium_Is_Stopped()==1
    I use to switch off some LEDs in case the device is stopped.

    Regards

    Gunnar Bohlen
    HMS-Networks

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