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AWR2944: Is there any suggestion on communication between MSS and DSS?

Part Number: AWR2944

I want to transfer some self-defined data between MSS and DSS and have some questions.

First , I use DPM_ioctl to send data from MSS to DSS and receive data in dpc ioctl in DSS, but DSS dont receive the first 5 msg while DPM_ioctl in MSS returns no error. I wonder if there's anything wrong with my code?

Then, i call DPM_ioctl after sensor start, and i find that DSS missed msg every 50ms as radar frame period is also 50ms. Is there any relationship between  these two 50ms?

is there any other methods to exchange data between MSS and DSS? since dpm ioctl seems not that stable as i expected before