Forum: µC & Digital Electronics AT91SAM9XE512 DMA programming via PDC

von Stephan (Guest)

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I'm having problems implementig usage of the PDC on my AT91SAM9XE512 
evaluation board.

I learned, that the PDC is configured through control registers of the 
peripheral devices; like in the code below
    // write receive-buffer-address to receive-pointer-register
    *AT91C_SPI0_RPR = receive_buffer_address;
    // write buffer-size to receive-counter-register
    *AT91C_SPI0_RCR = receive_buffer_size;
    // enbale receive
    // enbale transmit

but i need to access the PDC directly to change specific channel or 
FIQ-configurations, which i can't do by simply changing these control 
How do I directly access and control the PDC and it's 
subsystems/controls in C (I am currently using IAR workbench)?

Please help. Thank you.


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