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AWR2944EVM: How does ADCBUF trigger CBUFF HW Streaming?

Aaron Wang
Prodigy 40 points
Part Number: AWR2944EVM

Tool/software:

Hello,

I noticed that the CBUFF driver has two trigger channels: MMW_LVDS_STREAM_CBUFF_EDMA_CH_0 and MMW_LVDS_STREAM_CBUFF_EDMA_CH_1, which are DSS TPCC_B events 18 and 19.

Yet, I cannot find any code in the mmwave mcuplus SDK that actually indicates a link between the ADCBUF chirp available signal and these two trigger channels. In the technical reference manual, I only saw that the chirp available event, CHIP_AVAIL_IRQ, is available  on HWASS TPCC_B S no. 1. But that is separate from DSS TPCC_B, right?

Could anyone help clarify if the AWR2944EVM triggers the abovementioned trigger channels through hardware (thus making it impossible to change the usage of MMW_LVDS_STREAM_CBUFF_EDMA_CH_0  and MMW_LVDS_STREAM_CBUFF_EDMA_CH_1)?

Thank you very much for your assistance!

  • 0
    TI__Mastermind 20670 points

    Hi Aaron,

    Can you specify what exactly are you looking for? Do you want to use EDMA_DSS_TPCC_A_EVT_CBUFF_DMA_REQ0 and EDMA_DSS_TPCC_A_EVT_CBUFF_DMA_REQ1 channels for other purpose? This can be done by choosing appropriate mode of triggering the DMA transfer. You can refer to section 11.3.4 Initiating a DMA Transfer of AWR294x Technical Reference Manual (Rev. D). You can configure a DMA channel to trigger based on the hardware event that it's mapped to or through a manual SW trigger or a chain transfer trigger.

    Regards,

    Samhitha

  • 0 in reply to Samhitha Bobba
    Prodigy 40 points

    Hi Samhitha,

    Thank you for your response. 

    I am not necessarily interested in using those channels for another purpose. I merely am wondering how they trigger the CBUFF HW streaming process, because I was unable to find any code within the SDK that links the channel to some sort of event trigger, after glancing over the cbuff driver.

    I did see somewhere that they are "physical" channels. Does that mean that they are specifically designed to trigger the CBUFF HW edma transfers? And that code to configure a trigger is not necessary, because those channels are automatically triggered by the board's hardware?

    In other words, if I were to replace the trigger channels with different channels within the same TPCC, would HW streaming still trigger?

    Thank you,

    Aaron

  • 0 in reply to Aaron Wang
    TI__Mastermind 20670 points

    Hi Aaron,

    EDMA channels are mapped to hardware events. You can use the given channel which is mapped to hardware event and configure the channel to be event triggered. If you use a channel other than the one which is mapped to hardware event, you cannot trigger the DMA transfer based on any hardware event.

    Regards,

    Samhitha