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PIC24HJ128Gp504 SPI DMA Problem

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Thorsten

Joined: 08 Oct 2012
Posts: 1

PIC24HJ128Gp504 SPI DMA Problem

Posted: Mon Oct 08, 2012 8:02 am

Hi @ all,

I am trying the first time the DMA Controller in the PIC24. I just want to transmit one Array of Data out to the SPI2 Hardware.

This "Code" I use:

Code:

setup_dma(0, DMA_OUT_SPI2, DMA_byte );
dma_start(0, DMA_CONTINOUS, &pixel5[0] );

My array look so:

Code:

#BANK_DMA
unsigned int8 pixel5[550] = {};

So what I get out from that:

If I didn't do a normal "spi_write2" in the Main loop, I didn't get anything out from SPI. But if I send i.e. spi_write2(0x01); then the DMA send out 2 additional bytes. But why not 550 like the Arraysize ? I checked already the Listing, and it seems there is everything ok. Did I have to activate some Interrupts for the SPI? I hope someone could help.

Best Regards

Thorsten

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