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6SN1118-0DA12-0AA0
6SN1118-0DA12-0AA0
如何利用这个功能呢?一般我们配置 DMA 传输时,比如串口,一般外设地址就是 DR 寄存器。而如果我们想传输 TIM 的捕获值,我们可以设置成 CCR1 寄存器的地址。
这样也可以正常传输,但是只能在触发时传输一个寄存器的值,如果需要把两次捕获值都传输,那么就需要配置两个 DMA 通道完成,但这里又涉及到了两个 DMA 通道同步的问题,因为你肯定希望每次采集的两个数据都属于同一个脉冲。
所以 TIM 用了这两个寄存器解决这个问题,通过 ** DMAR 中转** ,就可以完成一次触发,连续传输两个 CCR 的值。
6SN1118-0DA12-0AA0
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