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ADC、DMA配置如下:使用DMA CH0/CH1分别搬运ADC0/ADC1 FIFO的数据
然后搬运完规定次数后,在DMA回调函数去关闭ADC
实测该过程消耗时间262us,排除有ADC启动时间、GPIO操作消耗时间,中断响应时间等误差,该数据已非常接近理论值 256us(512* 1/2M = 256us)
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