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TMS320F2800157: Sending more than 16 words of SPI data

Anurag
Prodigy 110 points
Part Number: TMS320F2800157
Other Parts Discussed in Thread: C2000WARE

Hi,

I'd like to know what options people use to send more than the full FIFO size of SPI data w/o DMA while also handling high priority interrupts for motor control and/or using an RTOS. For example, is it common to use a semaphore that waits for the TxFIFO to clear before sending the next set of 16 words. What other implementations can I consider that leverage the hardware on the C2000.

Thanks,

Anurag

  • 0
    TI__Genius 10055 points

    Hi Anurag,

    Typically, using the DMA with SPI is the recommended solution for your application. From a quick search, I see that TI-RTOS includes SPI drivers that can be used as targets (guide attached here). I will refer to the other expert on this matter and get back to you.

    Aishwarya

  • 0 in reply to Aishwarya Rajesh
    TI__Genius 10055 points

    Hi Anurag,

    One possible option is that TI-RTOS has a queue structure (Queues) similar to FreeRTOS, that can be used for synchronization as well as another buffer probably.

    Ultimately, the alternative to using a DMA is to handle x number of per-byte interrupts up to ~25 MHz though it will use considerable processer bandwidth depending on how much data you are transferring.

    If you haven't already, please refer to the C2000Ware SPI examples for F280015x as well as the DMA examples specific examples for other devices (such as F28004x), as a reference when creating your own custom code.

    Thanks,

    Aishwarya