[FAQ] AWR1642: AWR1843 MRR Resources and FAQ

Q1: What are the Software Tasks on DSS in the MRR demo and what is their purpose?

A1: There are 2 tasks on DSS. One can easily identify the tasks by searching for "Task_create" in the DSS related files.

Task #1: "MRR_DSS_initTask"

DSS Initialization task defined in "dss_main.c" performs following. This task runs only one time.

• Mailbox Driver  initialization
• ADC Buffer Driver Initialization
• Interrupts Registration
  
  • SOC_XWR18XX_DSS_INTC_EVENT_CHIRP_AVAIL
  • SOC_XWR18XX_DSS_INTC_EVENT_FRAME_START
• Processing static buffers configuration
  
  • Twiddle Factors for FFT processing
  • Windowing Coefficients
  • dBscan Buffers
  • Tracking Buffers
• EDMA configuration
• Start data processing task: "MRR_DSS_mmWaveTask"

Task #2: "MRR_DSS_mmWaveTask"

DSS processing task defined in "dss_main.c"

This task is implemented as a continuous "while(1)" loop that executes based on the two types of interrupt events registered  in init task: "CHIRP_AVAIL" and "FRAME_START"

The main functions of the processing task are the following

• "MmwDemo_processChirp()" - performs range FFT processing for each chirp. This is also called "interChirpProcessing"
• "MmwDemo_interFrameProcessing()" - performs doppler FFT, angle FFT, DOA, clustering, tracking. This is also called "interFrameProcessing'