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< title > usbd_msc — CherryUSB 1.5.3 documentation< / title >
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< p class = "caption" role = "heading" > < span class = "caption-text" > USB 基本知识点< / span > < / p >
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< p class = "caption" role = "heading" > < span class = "caption-text" > 例程说明< / span > < / p >
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< li class = "toctree-l1" > < a class = "reference internal" href = "usbh_msc.html" > usbh_msc< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "usbh_net.html" > usbh_net< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "usbd_vendor.html" > vendor device 驱动编写< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "usbh_vendor.html" > vendor host 驱动编写< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "usb_otg.html" > OTG 功能的使用< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../usbip/dwc3.html" > DWC3< / a > < / li >
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< p class = "caption" role = "heading" > < span class = "caption-text" > 工具使用< / span > < / p >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../tools/index.html" > chryusb_configurator< / a > < / li >
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< p class = "caption" role = "heading" > < span class = "caption-text" > 商业支持< / span > < / p >
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< section id = "usbd-msc" >
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< p > 本节主要演示 USB 模拟 U 盘功能。默认使用RAM 作为存储介质模拟 U 盘。< / p >
< ul class = "simple" >
< li > < p > 实现 U 盘的读写和获取容量接口，注意，容量 block_num 为虚拟的，实际没有这么多 block， < / p > < / li >
< / ul >
< p > block_size 一般为 512/2048/4096。< / p >
< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "kt" > void< / span > < span class = "w" > < / span > < span class = "nf" > usbd_msc_get_cap< / span > < span class = "p" > (< / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > busid< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > lun< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > block_num< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > block_size< / span > < span class = "p" > )< / span >
< span class = "p" > {< / span >
< span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > block_num< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mi" > 1000< / span > < span class = "p" > ;< / span > < span class = "w" > < / span > < span class = "c1" > //Pretend having so many buffer,not has actually.< / span >
< span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > block_size< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > BLOCK_SIZE< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "kt" > int< / span > < span class = "w" > < / span > < span class = "nf" > usbd_msc_sector_read< / span > < span class = "p" > (< / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > busid< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > lun< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "n" > sector< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > buffer< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "n" > length< / span > < span class = "p" > )< / span >
< span class = "p" > {< / span >
< span class = "w" > < / span > < span class = "k" > if< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > sector< / span > < span class = "w" > < / span > < span class = "o" > < < / span > < span class = "w" > < / span > < span class = "n" > BLOCK_COUNT< / span > < span class = "p" > )< / span >
< span class = "w" > < / span > < span class = "n" > memcpy< / span > < span class = "p" > (< / span > < span class = "n" > buffer< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > mass_block< / span > < span class = "p" > [< / span > < span class = "n" > sector< / span > < span class = "p" > ].< / span > < span class = "n" > BlockSpace< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > length< / span > < span class = "p" > );< / span >
< span class = "w" > < / span > < span class = "k" > return< / span > < span class = "w" > < / span > < span class = "mi" > 0< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "kt" > int< / span > < span class = "w" > < / span > < span class = "nf" > usbd_msc_sector_write< / span > < span class = "p" > (< / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > busid< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "n" > lun< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "n" > sector< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint8_t< / span > < span class = "w" > < / span > < span class = "o" > *< / span > < span class = "n" > buffer< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "kt" > uint32_t< / span > < span class = "w" > < / span > < span class = "n" > length< / span > < span class = "p" > )< / span >
< span class = "p" > {< / span >
< span class = "w" > < / span > < span class = "k" > if< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > sector< / span > < span class = "w" > < / span > < span class = "o" > < < / span > < span class = "w" > < / span > < span class = "n" > BLOCK_COUNT< / span > < span class = "p" > )< / span >
< span class = "w" > < / span > < span class = "n" > memcpy< / span > < span class = "p" > (< / span > < span class = "n" > mass_block< / span > < span class = "p" > [< / span > < span class = "n" > sector< / span > < span class = "p" > ].< / span > < span class = "n" > BlockSpace< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > buffer< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > length< / span > < span class = "p" > );< / span >
< span class = "w" > < / span > < span class = "k" > return< / span > < span class = "w" > < / span > < span class = "mi" > 0< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < p > 默认上述 API 在中断中执行，如果需要在非中断中执行，可以选择如下：< / p > < / li >
< / ul >
< p > 1， < cite > CONFIG_USBDEV_MSC_POLLING< / cite > 并在 while1 中调用 < cite > usbd_msc_polling< / cite > ，则读写函数在 while1 中执行。< / p >
< p > 2, OS 下开启 < cite > CONFIG_USBDEV_MSC_THREAD< / cite > ，则读写函数在线程中执行。< / p >
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2025-04-13 11:11:59 +00:00
< li > < p > 修改 < cite > CONFIG_USBDEV_MSC_BUFSIZE< / cite > 会影响 U 盘的读写速度，必须是 block_size 的整数倍，当然，也会增加 RAM 的占用。< / p > < / li >
2024-11-27 12:17:49 +00:00
< li > < p > 如果 RAM 例程可以用，但是介质更换成 SD 或者 FLASH 后不可用，则一定是介质驱动问题。< / p > < / li >
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2024-10-10 09:14:31 +00:00
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