i.MX RT Crossover MCUs中的主题 Re: dev_msc_sdcard set read only

dev_msc_sdcard set read only

vasudhevan — Tue, 10 Nov 2020 03:42:41 GMT

Hi,

We have refereed evkmimxrt1064_dev_msc_sdcard_bm example code.

It was working fine but from pc we can able to delete or write or format the drive.

But we want to set read only customer should not delete or write or format the driver.

I have seen macro for formatted device but we don't know how to use.

/*! @brief Unformatted Media - Maximum formatting capacity for this cartridge*/ #define USB_DEVICE_MSC_UFI_UNFORMATTED_MEDIA 0x01U

usb_device_mode_parameters_header_struct_t g_ModeParametersHeader = { /*refer to ufi spec mode parameter header*/ 0x0000, /*!< Mode Data Length*/ 0x00, /*!<Default medium type (current mounted medium type)*/ 0x00, /*!MODE SENSE command, a Write Protected bit of zero indicates the medium is write enabled*/ {0x00, 0x00, 0x00, 0x00} /*!<This bit should be set to zero*/ };

How to set properly configure to avoid write or delete or modify or format the drive ?

Thanks & Regards,

Vasu

Re: dev_msc_sdcard set read only

jeremyzhou — Wed, 11 Nov 2020 07:42:00 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
According to your description, it seems that you want to simulate a CD-ROM device instead of a U-disk, to make it, it needs more code modification than you expect actually and you can learn more details by review the link: https://www.usbcopier.com/usb-write-protection/#a

Have a great day,
TIC

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