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dsp c5517的 dma 的channel0到channel15 总共16个通道,是如何与工作事件一一对应的?

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dsp c5517的 dma 的channel0到channel15 总共16个通道,我看到官方的例程,uart的发射和接收都是用chan4,我想为什么选择的是chan4?在手册的哪里能体现出来??