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FR802怎么用串口DMA接收不定长数据
【有道云笔记】串口DMA接收不定长度数据 https://share.note.youdao.com/s/W992cSeo
参考下这个，实现方式
串口多少速率呀，要用dma
@zr FR802串口寄存器里USART_CTRL2（Offset 0x0C）里的RTOL(接收超时配置)只有8bit，单位1us，最大超时时间255us，是这样吗
@zr 这个接收超时功能怎么使用