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一段RAM的内容转移到另一段RAM区,可不可用DMA操作?

如果可以,比一个地址一个地址转移能节省多少时间?

  • 楼主你好!

    应该是可以的,但是有一定的要求,以F2806X为例: DMA能访问的空间如下,用DMA的好处为在于硬件在后台自动搬运数据,不需要CPU去干预,因此在这段时间CPU还可以执行其他的代码。F2806X DMA搬运数据的速度为:4 cycles/word,应该不会比CPU慢。

    Data sources/destinations:

    – L5-L8 32K x 16 SARAM

    – ADC memory bus mapped result registers

    – McBSP transmit and receive buffers

    – ePWM1-8 / HRPWM1-8

  • – L5-L8 32K x 16 SARAM?

    F28M35的DSP只有L0~L3.