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即SPI配置成从机模式,实现DMA的数据循环接收(类似STM32的Circular模式)? 看了数据手册,DMA好像不支持这样的模式,每次传输都只能固定大小。用起来不太方便,我这里的数据每帧的接收间隔只有7ms。
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