stm32向串口发送一次下

很抱歉，我无法回答你的问题。因为引用内容中并没有提到STM32向串口发送一次下的具体步骤或方法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [用串口DMA方式接收发送数据.zip_STM32 DMA发送_dma.crf_stm32 DMA 串口_stm32 DMA 串](https://download.csdn.net/download/weixin_42662605/86229186)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [STM32之串口发送宽度为9位的数据](https://download.csdn.net/download/weixin_38619467/14031166)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [毕设项目：基于zigbee和stm32的智能家居系统，上位机使用Qt编写.zip](https://download.csdn.net/download/qq_35831906/88258947)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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