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Read time: 2 minute(s)
< / div > < div class = "- topic/body concept/conbody body conbody" > < section class = "- topic/section section" id = "uart_configuration__section_n5y_3zy_21c" data-ofbid = "uart_configuration__section_n5y_3zy_21c" > < h2 class = "- topic/title title sectiontitle" > 内核配置< / h2 >
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< ol class = "- topic/ol ol" id = "uart_configuration__ol_tyx_gml_sdc" data-ofbid = "uart_configuration__ol_tyx_gml_sdc" > < li class = "- topic/li li" data-ofbid = "d219677e30__20250121171646" >
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< div class = "- topic/p p" data-ofbid = "d219677e34__20250121171646" > 在 SDK 根目录下，执行下列命令，进入 kernel
的功能配置界面：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__codeblock_wg1_3ml_sdc" data-ofbid = "uart_configuration__codeblock_wg1_3ml_sdc" > make kernel-menuconfig< / pre > < / div >
< p class = "- topic/p p" data-ofbid = "d219677e39__20250121171646" > 或使用简写命令< / p >
< div class = "- topic/p p" data-ofbid = "d219677e42__20250121171646" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__codeblock_uss_hml_sdc" data-ofbid = "uart_configuration__codeblock_uss_hml_sdc" > make km< / pre >
< / div >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d219677e49__20250121171646" >
< div class = "- topic/p p" data-ofbid = "d219677e51__20250121171646" > 按如下示例配置相应选项：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__codeblock_ghy_tzy_21c" data-ofbid = "uart_configuration__codeblock_ghy_tzy_21c" > Device Drivers
Character devices
Serial driver
< *> < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > and compatible serial support
< *> < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > support < strong class = "hl-keyword" > for< / strong > ArtInChip serial ports
[*] Support < span class = "hl-number" > 8250< / span > _core.* kernel options (DEPRECATED)
[*] Support < strong class = "hl-keyword" > for< / strong > variants of the < span class = "hl-number" > 16550< / span > A serial port
[ ] Support < strong class = "hl-keyword" > for< / strong > Fintek F81216A LPC to < span class = "hl-number" > 4< / span > UART RS485 API
[*] Console on < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > and compatible serial port
(< span class = "hl-number" > 8< / span > ) Maximum number of < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > serial ports
(< span class = "hl-number" > 8< / span > ) Number of < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > serial ports to < strong class = "hl-keyword" > register< / strong > at runtime
[ ] Extended < span class = "hl-number" > 8250< / span > /< span class = "hl-number" > 16550< / span > serial driver options< / pre > < / div >
< / li > < / ol >
< / div >
< / section > < section class = "- topic/section section" id = "uart_configuration__section_p5y_3zy_21c" data-ofbid = "uart_configuration__section_p5y_3zy_21c" > < h2 class = "- topic/title title sectiontitle" > 系统参数配置< / h2 >
< p class = "- topic/p p" data-ofbid = "d219677e63__20250121171646" > D211 提供最多 8 个 UART 端口。< / p >
< div class = "- topic/p p" data-ofbid = "d219677e66__20250121171646" > 这些参数主要在文件 < span class = "+ topic/ph sw-d/filepath ph filepath" > target/d211/common/d211.dtsi< / span > 中，模块系统参数随 SoC
的设定而定，一般不能进行更改，除非更换了新的
SoC， < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__codeblock_g3c_5zy_21c" data-ofbid = "uart_configuration__codeblock_g3c_5zy_21c" > uart1: serial@< span class = "hl-number" > 18711000< / span > {
compatible = < span class = "hl-string" > "artinchip,aic-uart-v1.0"< / span > ;
reg = < < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x18711000< / span > < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x400< / span > > ;
interrupts-extended = < & plic0 < span class = "hl-number" > 77< / span > IRQ_TYPE_LEVEL_HIGH> ;
reg-shift = < < span class = "hl-number" > 2< / span > > ;
reg-io-width = < < span class = "hl-number" > 4< / span > > ;
clocks = < & cmu CLK_UART1> ;
clock-frequency = < < span class = "hl-number" > 48000000< / span > > ;
resets = < & rst RESET_UART1> ;
dmas = < & dma DMA_UART1> , < & dma DMA_UART1> ;
dma-names = < span class = "hl-string" > "rx"< / span > , < span class = "hl-string" > "tx"< / span > ;
};< / pre > < / div >
< ul class = "- topic/ul ul" id = "uart_configuration__ul_r5y_3zy_21c" data-ofbid = "uart_configuration__ul_r5y_3zy_21c" > < li class = "- topic/li li" data-ofbid = "d219677e75__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > reg-shift< / span > < p class = "- topic/p p" data-ofbid = "d219677e78__20250121171646" > UART 控制器兼容 8250 标准, 寄存器寻址使用索引而不是偏移描述，
用来进行索引和地址的转换计算，该值不能修改< / p > < / li > < li class = "- topic/li li" data-ofbid = "d219677e80__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > reg-io-width< / span > < p class = "- topic/p p" data-ofbid = "d219677e83__20250121171646" > 为寄存器的位宽，< code class = "+ topic/ph pr-d/codeph ph codeph" > 4< / code > 表示采用 32
位标准位宽，该值不能修改< / p > < / li > < li class = "- topic/li li" data-ofbid = "d219677e88__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > clock-frequency< / span > < p class = "- topic/p p" data-ofbid = "d219677e91__20250121171646" > D211 UART 模块的父时钟为 48M，
模块时钟的频率通过对其父时钟的进行除频来设置，
不同的模块时钟时波特率的误差可能不同，因此可以根据目标波特率进行模块时钟的设置。关于详细设置，可查看 < a class = "- topic/xref xref" href = "../../reused/module-clock_reused.html#topic_y4l_wwh_ryb" > 模块时钟< / a > < / p > < / li > < / ul >
< / section > < section class = "- topic/section section" id = "uart_configuration__section_v5y_3zy_21c" data-ofbid = "uart_configuration__section_v5y_3zy_21c" > < h2 class = "- topic/title title sectiontitle" > 功能参数配置< / h2 >
< p class = "- topic/p p" data-ofbid = "d219677e102__20250121171646" > 功能参数主要针对某一个使用方案而定，因此随着方案的不同，参数很可能不同，< / p >
< div class = "- topic/p p" data-ofbid = "d219677e105__20250121171646" > 这些参数主要在文件 < span class = "+ topic/ph sw-d/filepath ph filepath" > target/d211/xxx/board.dts< / span >
中，功能参数的设置必须和硬件原理图相匹配< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__codeblock_vs2_lzy_21c" data-ofbid = "uart_configuration__codeblock_vs2_lzy_21c" > & uart1 {
pinctrl-names = < span class = "hl-string" > "default"< / span > ;
pinctrl-< span class = "hl-number" > 0< / span > = < & uart1_pins_a> ;
linux,rs485-enabled-at-boot-time;
aic,rs485-compact-io-mode;
status = < span class = "hl-string" > "okay"< / span > ;
};< / pre > < / div >
< ul class = "- topic/ul ul" id = "uart_configuration__ul_x5y_3zy_21c" data-ofbid = "uart_configuration__ul_x5y_3zy_21c" > < li class = "- topic/li li" data-ofbid = "d219677e114__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > pinctrl-names< / span > < p class = "- topic/p p" data-ofbid = "d219677e117__20250121171646" > SDK 一般会把要使用的某一功能的端口组预先定义，后期直接使用即可，定义一般放在
< span class = "+ topic/ph sw-d/filepath ph filepath" > target/d211/common/aicxxx-pinctrl.dtsi< / span > 文件中，目前
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > pinctrl-names< / span > 均设置为 < span class = "+ topic/ph ui-d/uicontrol ph uicontrol" > default< / span >
即可。< / p > < / li > < li class = "- topic/li li" data-ofbid = "d219677e128__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > pinctrl-0< / span > < p class = "- topic/p p" data-ofbid = "d219677e131__20250121171646" > 即指示 UART 预先定义的端口组，其中包括用于进行发送/接收选择的 GPIO
端口< / p > < / li > < li class = "- topic/li li" data-ofbid = "d219677e133__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > linux,rs485-enabled-at-boot-time< / span > < p class = "- topic/p p" data-ofbid = "d219677e136__20250121171646" > 该端口配置为 RS485< / p > < / li > < li class = "- topic/li li" data-ofbid = "d219677e138__20250121171646" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > aic,rs485-compact-io-mode< / span > < p class = "- topic/p p" data-ofbid = "d219677e141__20250121171646" > 使用 AIC 独有的精简 IO 模式， 只使用 2
个端口，一个用作发送接收，一个用作发送和接收控制< / p > < / li > < / ul >
< p class = "- topic/p p" data-ofbid = "d219677e144__20250121171646" > 其中 rs485 功能还有其他一些可选配置项，如 time delay 等，目前 SoC 内部对此类参数做了很好的兼容，除非特殊的 rs485
模组，否则均不需要额外配置参数< / p >
< / section > < section class = "- topic/section section" id = "uart_configuration__section_cvy_3zy_21c" data-ofbid = "uart_configuration__section_cvy_3zy_21c" > < h2 class = "- topic/title title sectiontitle" > 调试端口< / h2 >
< p class = "- topic/p p" data-ofbid = "d219677e152__20250121171646" > 调试端口的配置除了要使能相应的 UART 端口，还要在 < span class = "+ topic/ph sw-d/filepath ph filepath" > target/aicxxx/common/env.txt< / span >
文件中配置波特率等相关参数：< / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "uart_configuration__pre_dvy_3zy_21c" data-ofbid = "uart_configuration__pre_dvy_3zy_21c" > earlycon=smhconsole=ttyS0,< span class = "hl-number" > 115200< / span > n8< / pre >
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