The right sequence of starting PDCA of peripherals in UC3B

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darthvader
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Posted by darthvader: Thu. Jan 24, 2008 - 09:19 PM
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Hi,

Just wanna ask how to start the PDCA of peripherals?

Should I always enable PDCA first and then start peripheral transfer?

For example, should I setup the PDCA of SPI and then enable the PDCA and then write to TDR of SPI to start the process?

Cheng

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AVR Microcontrollers, AVR UC3
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sma
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Posted by sma: Thu. Jan 24, 2008 - 09:51 PM
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Quote:

For example, should I setup the PDCA of SPI and then enable the PDCA and then write to TDR of SPI to start the process?

Yes, that will do it.

In a general way, I prefer configuring the peripheral first, then enable the DMA channel to start the transfer.

-sma

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darthvader
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Posted by darthvader: Thu. Jan 24, 2008 - 09:59 PM
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so you means it's ok to start the first byte (or word) SPI transfer first and then enable its DMA, then the DMA will continue automatically?

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