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Can DMA Channels have Multiple Directions?

A S
Intellectual 410 points

This is probably a newbie question, but I wanted to make sure it was or wasn't possible.

Can a single DMA channel be configured to both send and receive DMA transfers? (configured via multiple triggers)

For example, could I configure a DMA channel that connects into an external peripheral using a SPI interface USCI module that transfers data from and to an MSP430?

The reason I ask is that some MSP430s have only 3 channels. If they are "one-way", then to read and write to a single external peripheral would take up two of the three channels. I suppose the solution in that case would be to get a different MSP430?

  • 0
    Guru 46710 points
    DMA channel is unidirectional unless you reconfigure it on the fly. Unfortunately for most applications this will break DMA concept as such because reconfiguration overhead will trash all the gain of DMA :) Possibly you can use reconfiguration of DMA for CPU-controlled half duplex transfer of (big) data blocks

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