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< p class = "caption" role = "heading" > < span class = "caption-text" > 快速上手< / span > < / p >
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< li class = "toctree-l2" > < a class = "reference internal" href = "#usbh-link-script" > 主机链接脚本修改< / a > < / li >
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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" > API 手册< / span > < / p >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../api/api_port.html" > 主从驱动< / a > < / li >
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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 = "../demo/usbd_vendor.html" > vendor device 驱动编写< / a > < / li >
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< p class = "caption" role = "heading" > < span class = "caption-text" > USBIP 介绍< / span > < / p >
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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 = "breadcrumb-item active" > 芯片通用移植指南< / li >
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< a href = "../_sources/quick_start/transplant.rst.txt" rel = "nofollow" > View page source< / a >
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< section id = "id1" >
< h1 > 芯片通用移植指南< a class = "headerlink" href = "#id1" title = "Link to this heading" > < / a > < / h1 >
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< p > 本节主要介绍所有带 USB IP 的芯片，移植 CherryUSB 主从协议栈时的通用步骤和注意事项。在移植之前，需要 < strong > 你准备好一个可以打印 helloworld 的基本工程< / strong > ，默认打印使用 < cite > printf< / cite > , 如果是主机模式， < strong > 则需要准备好可以正常执行 os 调度的基本工程< / strong > 。< / p >
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< section id = "usb-device" >
< h2 > USB Device 移植要点< a class = "headerlink" href = "#usb-device" title = "Link to this heading" > < / a > < / h2 >
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< ul class = "simple" >
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< li > < p > 拷贝 CherryUSB 源码到工程目录下，并按需添加源文件和头文件路径，头文件路径建议全部添加。其中 < cite > usbd_core.c< / cite > 和 < cite > usb_dc_xxx.c< / cite > 为必须添加项。而 < cite > usb_dc_xxx.c< / cite > 是芯片所对应的 USB IP dcd 部分驱动，如果不知道自己芯片属于那个 USB IP， < strong > port< / strong > 目录下的不同 USB IP 的 readme。如果使用的 USB IP 没有支持，只能自己实现了< / p > < / li >
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< li > < p > 拷贝 < cite > cherryusb_config_template.h< / cite > 文件到自己工程目录下，命名为 < cite > usb_config.h< / cite > ，并添加相应的目录头文件路径< / p > < / li >
< li > < p > 实现 < cite > usb_dc_low_level_init< / cite > 函数（该函数主要负责 USB 时钟、引脚、中断的初始化）。该函数可以放在你想要放的任何参与编译的 c 文件中。如何进行 USB 的时钟、引脚、中断等初始化，请自行根据你使用的芯片原厂提供的源码中进行添加。< / p > < / li >
< li > < p > 在中断函数中调用 < cite > USBD_IRQHandler< / cite > ，并传入 < cite > busid< / cite > , 如果你的 SDK 中中断入口已经存在 < cite > USBD_IRQHandler< / cite > ，请更改 USB 协议栈中的名称< / p > < / li >
2025-06-24 09:58:22 +00:00
< li > < p > 如果芯片带 cache， < a class = "reference internal" href = "#usb-cache" > < span class = "std std-ref" > cache 配置修改< / span > < / a > 章节< / p > < / li >
2025-07-22 10:21:23 +00:00
< li > < p > 注册描述符并调用 < cite > usbd_initialize< / cite > ，填入 < cite > busid< / cite > 和 USB IP 的 < cite > reg base< / cite > ， < cite > busid< / cite > 从 0 开始，不能超过 < cite > CONFIG_USBDEV_MAX_BUS< / cite > ，可以直接使用 demo 下的 template< / p > < / li >
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< / ul >
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< / section >
< section id = "usb-host" >
< h2 > USB Host 移植要点< a class = "headerlink" href = "#usb-host" title = "Link to this heading" > < / a > < / h2 >
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< ul class = "simple" >
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< li > < p > 拷贝 CherryUSB 源码到工程目录下，并按需添加源文件和头文件路径，头文件路径建议全部添加。其中 < cite > usbh_core.c< / cite > 、 < cite > usb_hc_xxx.c< / cite > 以及 < strong > osal< / strong > 目录下源文件（根据不同的 os 选择对应的源文件）为必须添加项。而 < cite > usb_hc_xxx.c< / cite > 是芯片所对应的 USB IP hcd 部分驱动，如果不知道自己芯片属于那个 USB IP， < strong > port< / strong > 目录下的不同 USB IP 的 readme。如果使用的 USB IP 没有支持，只能自己实现了< / p > < / li >
2024-09-24 13:59:54 +00:00
< li > < p > 拷贝 < cite > cherryusb_config_template.h< / cite > 文件到自己工程目录下，命名为 < cite > usb_config.h< / cite > ，并添加相应的目录头文件路径< / p > < / li >
< li > < p > 实现 < cite > usb_hc_low_level_init< / cite > 函数（该函数主要负责 USB 时钟、引脚、中断的初始化）。该函数可以放在你想要放的任何参与编译的 c 文件中。如何进行 USB 的时钟、引脚、中断等初始化，请自行根据你使用的芯片原厂提供的源码中进行添加。< / p > < / li >
2025-08-30 11:24:27 +00:00
< li > < p > 调用 < cite > usbh_initialize< / cite > 并填入 < cite > busid< / cite > 和 USB IP 的 < cite > reg base< / cite > 还有 < cite > event_handler< / cite > 可缺省为NULL， < cite > busid< / cite > 从 0 开始，不能超过 < cite > CONFIG_USBHOST_MAX_BUS< / cite > < / p > < / li >
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< li > < p > 在中断函数中调用 < cite > USBH_IRQHandler< / cite > ，并传入 < cite > busid< / cite > , 如果你的 SDK 中中断入口已经存在 < cite > USBH_IRQHandler< / cite > ，请更改 USB 协议栈中的名称< / p > < / li >
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< li > < p > 链接脚本修改参考 < a class = "reference internal" href = "#usbh-link-script" > < span class = "std std-ref" > 主机链接脚本修改< / span > < / a > 章节< / p > < / li >
< li > < p > 如果芯片带 cache， < a class = "reference internal" href = "#usb-cache" > < span class = "std std-ref" > cache 配置修改< / span > < / a > 章节< / p > < / li >
2025-08-30 11:24:27 +00:00
< li > < p > 调用 < cite > usbh_initialize< / cite > ，填入 < cite > busid< / cite > 和 USB IP 的 < cite > reg base< / cite > 还有 < cite > event_handler< / cite > 可缺省为NULL， < cite > busid< / cite > 从 0 开始，不能超过 < cite > CONFIG_USBHOST_MAX_BUS< / cite > 。基础的 cdc + hid + msc 参考 < cite > usb_host.c< / cite > 文件，其余参考 < strong > platform< / strong > 目录下适配< / p > < / li >
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< / ul >
< / section >
< section id = "usbh-link-script" >
< span id = "id2" > < / span > < h2 > 主机链接脚本修改< a class = "headerlink" href = "#usbh-link-script" title = "Link to this heading" > < / a > < / h2 >
< p > 在使用主机时，如果没有修改链接脚本，会报 < cite > __usbh_class_info_start__< / cite > 和 < cite > __usbh_class_info_end__< / cite > 未定义的错误。因为主机协议栈需要在链接脚本中添加一个 section 来存储 class 信息。< / p >
< ul class = "simple" >
< li > < p > 如果使用的是 KEIL 无需修改< / p > < / li >
< li > < p > 如果使用的是 GCC ，需要在链接脚本中添加如下代码（需要放在 flash 位置，建议放最后）：< / p > < / li >
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< / ul >
< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "c1" > // 在 ld 文件中添加如下代码< / span >
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< span class = "p" > .< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > ALIGN< / span > < span class = "p" > (< / span > < span class = "mi" > 4< / span > < span class = "p" > );< / span >
< span class = "n" > __usbh_class_info_start__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > .;< / span >
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< span class = "n" > KEEP< / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > usbh_class_info< / span > < span class = "p" > ))< / span >
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< span class = "n" > __usbh_class_info_end__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > .;< / span >
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< / pre > < / div >
< / div >
< p > GCC 举例如下：< / p >
< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "cm" > /* The program code and other data into " FLASH" Rom type memory */< / span >
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< span class = "p" > .< / span > < span class = "n" > text< / span > < span class = "w" > < / span > < span class = "o" > :< / span >
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< span class = "p" > {< / span >
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< span class = "p" > .< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > ALIGN< / span > < span class = "p" > (< / span > < span class = "mi" > 4< / span > < span class = "p" > );< / span >
< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > text< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "cm" > /* .text sections (code) */< / span >
< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > text< / span > < span class = "o" > *< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "cm" > /* .text* sections (code) */< / span >
< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > glue_7< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "cm" > /* glue arm to thumb code */< / span >
< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > glue_7t< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "cm" > /* glue thumb to arm code */< / span >
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< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > eh_frame< / span > < span class = "p" > )< / span >
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< span class = "n" > KEEP< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > init< / span > < span class = "p" > ))< / span >
< span class = "n" > KEEP< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > fini< / span > < span class = "p" > ))< / span >
< span class = "p" > .< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > ALIGN< / span > < span class = "p" > (< / span > < span class = "mi" > 4< / span > < span class = "p" > );< / span >
< span class = "n" > __usbh_class_info_start__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > .;< / span >
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< span class = "n" > KEEP< / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > usbh_class_info< / span > < span class = "p" > ))< / span >
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< span class = "n" > __usbh_class_info_end__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > .;< / span >
< span class = "p" > .< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > ALIGN< / span > < span class = "p" > (< / span > < span class = "mi" > 4< / span > < span class = "p" > );< / span >
< span class = "n" > _etext< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > .;< / span > < span class = "w" > < / span > < span class = "cm" > /* define a global symbols at end of code */< / span >
< span class = "p" > }< / span > < span class = "w" > < / span > < span class = "o" > > < / span > < span class = "w" > < / span > < span class = "n" > FLASH< / span >
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< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < p > Segger Embedded Studio 举例如下：< / p > < / li >
< / ul >
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< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > define< / span > < span class = "w" > < / span > < span class = "n" > block< / span > < span class = "w" > < / span > < span class = "n" > cherryusb_usbh_class_info< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "n" > section< / span > < span class = "w" > < / span > < span class = "p" > .< / span > < span class = "n" > usbh_class_info< / span > < span class = "w" > < / span > < span class = "p" > };< / span >
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< span class = "n" > define< / span > < span class = "w" > < / span > < span class = "n" > exported< / span > < span class = "w" > < / span > < span class = "n" > symbol< / span > < span class = "w" > < / span > < span class = "n" > __usbh_class_info_start__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > start< / span > < span class = "w" > < / span > < span class = "n" > of< / span > < span class = "w" > < / span > < span class = "n" > block< / span > < span class = "w" > < / span > < span class = "n" > cherryusb_usbh_class_info< / span > < span class = "p" > ;< / span >
< span class = "n" > define< / span > < span class = "w" > < / span > < span class = "n" > exported< / span > < span class = "w" > < / span > < span class = "n" > symbol< / span > < span class = "w" > < / span > < span class = "n" > __usbh_class_info_end__< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > end< / span > < span class = "w" > < / span > < span class = "n" > of< / span > < span class = "w" > < / span > < span class = "n" > block< / span > < span class = "w" > < / span > < span class = "n" > cherryusb_usbh_class_info< / span > < span class = "w" > < / span > < span class = "o" > +< / span > < span class = "w" > < / span > < span class = "mi" > 1< / span > < span class = "p" > ;< / span >
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< span class = "n" > place< / span > < span class = "w" > < / span > < span class = "n" > in< / span > < span class = "w" > < / span > < span class = "n" > AXI_SRAM< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "n" > block< / span > < span class = "w" > < / span > < span class = "n" > cherryusb_usbh_class_info< / span > < span class = "w" > < / span > < span class = "p" > };< / span >
< span class = "n" > keep< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "n" > section< / span > < span class = "w" > < / span > < span class = "p" > .< / span > < span class = "n" > usbh_class_info< / span > < span class = "p" > };< / span >
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< / pre > < / div >
< / div >
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< / section >
< section id = "cache" >
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< span id = "usb-cache" > < / span > < h2 > cache 配置修改< a class = "headerlink" href = "#cache" title = "Link to this heading" > < / a > < / h2 >
< p > 对于带 cache 的芯片，协议栈以及 port 中不会对 cache 区域的 ram 进行 clean 或者 invalid，
< cite > USB_NOCACHE_RAM_SECTION< / cite > 宏表示将变量指定到非 cache ram上， < cite > USB_NOCACHE_RAM_SECTION< / cite > 定义为 < cite > __attribute__((section(“.noncacheable”)))< / cite > 。
因此，用户需要在对应的链接脚本中添加 no cache ram 的 section， < cite > .noncacheable< / cite > 。< / p >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
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< p > 需要注意，光修改链接脚本中的 nocache section 是不够的，还需要配置该 section 中的 ram 是真的 nocache， （ ） < / p >
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< / div >
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< p > GCC:< / p >
< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > MEMORY< / span >
< span class = "p" > {< / span >
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< span class = "n" > RAM< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > xrw< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "o" > :< / span > < span class = "w" > < / span > < span class = "n" > ORIGIN< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mh" > 0x20000000< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > LENGTH< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mi" > 256< / span > < span class = "n" > K< / span > < span class = "w" > < / span > < span class = "o" > -< / span > < span class = "w" > < / span > < span class = "mi" > 64< / span > < span class = "n" > K< / span >
< span class = "n" > RAM_nocache< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > xrw< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "o" > :< / span > < span class = "w" > < / span > < span class = "n" > ORIGIN< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mh" > 0x20030000< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > LENGTH< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mi" > 64< / span > < span class = "n" > K< / span >
< span class = "n" > FLASH< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > rx< / span > < span class = "p" > )< / span > < span class = "w" > < / span > < span class = "o" > :< / span > < span class = "w" > < / span > < span class = "n" > ORIGIN< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mh" > 0x8000000< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > LENGTH< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "mi" > 512< / span > < span class = "n" > K< / span >
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< span class = "p" > }< / span >
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< span class = "p" > .< / span > < span class = "n" > _nocache_ram< / span > < span class = "w" > < / span > < span class = "o" > :< / span >
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< span class = "p" > {< / span >
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< span class = "p" > .< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > ALIGN< / span > < span class = "p" > (< / span > < span class = "mi" > 4< / span > < span class = "p" > );< / span >
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< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > noncacheable< / span > < span class = "p" > )< / span >
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< span class = "p" > }< / span > < span class = "w" > < / span > < span class = "o" > > < / span > < span class = "n" > RAM_nocache< / span >
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< / pre > < / div >
< / div >
< p > SCT:< / p >
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< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > LR_IROM1< / span > < span class = "w" > < / span > < span class = "mh" > 0x08000000< / span > < span class = "w" > < / span > < span class = "mh" > 0x00200000< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "p" > ;< / span > < span class = "w" > < / span > < span class = "n" > load< / span > < span class = "w" > < / span > < span class = "n" > region< / span > < span class = "w" > < / span > < span class = "n" > size_region< / span >
< span class = "n" > ER_IROM1< / span > < span class = "w" > < / span > < span class = "mh" > 0x08000000< / span > < span class = "w" > < / span > < span class = "mh" > 0x00200000< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "p" > ;< / span > < span class = "w" > < / span > < span class = "n" > load< / span > < span class = "w" > < / span > < span class = "n" > address< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "n" > execution< / span > < span class = "w" > < / span > < span class = "n" > address< / span >
< span class = "o" > *< / span > < span class = "p" > .< / span > < span class = "n" > o< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "n" > RESET< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "o" > +< / span > < span class = "n" > First< / span > < span class = "p" > )< / span >
< span class = "o" > *< / span > < span class = "p" > (< / span > < span class = "n" > InRoot$$Sections< / span > < span class = "p" > )< / span >
< span class = "p" > .< / span > < span class = "n" > ANY< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "o" > +< / span > < span class = "n" > RO< / span > < span class = "p" > )< / span >
< span class = "p" > .< / span > < span class = "n" > ANY< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "o" > +< / span > < span class = "n" > XO< / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "n" > RW_IRAM2< / span > < span class = "w" > < / span > < span class = "mh" > 0x24000000< / span > < span class = "w" > < / span > < span class = "mh" > 0x00070000< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "p" > ;< / span > < span class = "w" > < / span > < span class = "n" > RW< / span > < span class = "w" > < / span > < span class = "n" > data< / span >
< span class = "p" > .< / span > < span class = "n" > ANY< / span > < span class = "w" > < / span > < span class = "p" > (< / span > < span class = "o" > +< / span > < span class = "n" > RW< / span > < span class = "w" > < / span > < span class = "o" > +< / span > < span class = "n" > ZI< / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "n" > USB_NOCACHERAM< / span > < span class = "w" > < / span > < span class = "mh" > 0x24070000< / span > < span class = "w" > < / span > < span class = "mh" > 0x00010000< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "p" > ;< / span > < span class = "w" > < / span > < span class = "n" > RW< / span > < span class = "w" > < / span > < span class = "n" > data< / span >
< span class = "o" > *< / span > < span class = "p" > (.< / span > < span class = "n" > noncacheable< / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
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< / pre > < / div >
< / div >
< p > ICF:< / p >
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< div class = "highlight-C notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > define< / span > < span class = "w" > < / span > < span class = "n" > region< / span > < span class = "w" > < / span > < span class = "n" > NONCACHEABLE_RAM< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "p" > [< / span > < span class = "n" > from< / span > < span class = "w" > < / span > < span class = "mh" > 0x1140000< / span > < span class = "w" > < / span > < span class = "n" > size< / span > < span class = "w" > < / span > < span class = "mi" > 256< / span > < span class = "n" > K< / span > < span class = "p" > ];< / span >
< span class = "n" > place< / span > < span class = "w" > < / span > < span class = "n" > in< / span > < span class = "w" > < / span > < span class = "n" > NONCACHEABLE_RAM< / span > < span class = "w" > < / span > < span class = "p" > {< / span > < span class = "w" > < / span > < span class = "n" > section< / span > < span class = "w" > < / span > < span class = "p" > .< / span > < span class = "n" > noncacheable< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > section< / span > < span class = "w" > < / span > < span class = "p" > .< / span > < span class = "n" > noncacheable< / span > < span class = "p" > .< / span > < span class = "n" > init< / span > < span class = "p" > ,< / span > < span class = "w" > < / span > < span class = "n" > section< / span > < span class = "w" > < / span > < span class = "p" > .< / span > < span class = "n" > noncacheable< / span > < span class = "p" > .< / span > < span class = "n" > bss< / span > < span class = "w" > < / span > < span class = "p" > };< / span > < span class = "w" > < / span > < span class = "c1" > // Noncacheable< / span >
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< / pre > < / div >
< / div >
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< / section >
< / section >
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< / div >
< / div >
< footer > < div class = "rst-footer-buttons" role = "navigation" aria-label = "Footer" >
< a href = "demo.html" class = "btn btn-neutral float-left" title = "基于现有 demo 快速验证" accesskey = "p" rel = "prev" > < span class = "fa fa-arrow-circle-left" aria-hidden = "true" > < / span > Previous< / a >
< a href = "rtthread.html" class = "btn btn-neutral float-right" title = "基于 RT-Thread 软件包开发指南" accesskey = "n" rel = "next" > Next < span class = "fa fa-arrow-circle-right" aria-hidden = "true" > < / span > < / a >
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< hr / >
< div role = "contentinfo" >
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< p > © Copyright 2022 ~ 2025, sakumisu.< / p >
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