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EK-TM4C123GXL: uDMA Control Table as 32bit ?

Kevin Hinrichs
Prodigy 180 points
Part Number: EK-TM4C123GXL

Why is the uDMA Control table declared as uint8_t and not as uint32_t in the Tivaware examples?

According to the datasheet the "registers" for the target address and so on are 32bit long.

  • 0
    TI__Guru**** 191886 points

    Hi,

      I think the reason is that uDMA control table must be aligned to 1024 bytes. In order to satisfy this requirement, the software developer for the example uses the pragma DATA_ALIGN as follows to force the alignment. I suppose uint32_t can be used for pui8ControlTable[256] to achieve the same thing. 

    #pragma DATA_ALIGN(pui8ControlTable, 1024)
    uint8_t pui8ControlTable[1024];

    As a heads-up, I'm currently on vacation. Please expect delay in my response.