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CCS/IWR1642BOOST: sdk2. X and selected demo ,after using the serial port reading function, the DSS stops running for a few seconds.

Part Number: IWR1642BOOST

Tool/software: Code Composer Studio

In the process of debugging, whenever I use the serial port to read data, the DSS will run and stop running with an error. (I used sdk2. X and selected demo as high accuracy). The error content is as follows:
               {moduleා8}: ".. / dss_main. C", line 200: error {ID: 0x10000, args: [0x80dd5c, 0x80dd5c]}
               Xdc.runtime.error.raise: terminating execution
I went to query the location of the specified error report, and the content is as follows:
               /*Check if previous sharp processing has completed*/
               Debugpau assert (gmwdssmcb. Datapathobj. Interframeproctoken = = 0);
               Gmwdssmcb. Datapathobj. Interframeproctoken + +;
I doubt it's my configuration problem. When I change 500 to 999, the execution time will be longer. But I can't solve this problem all the time. I hope I can get your answer. Thank you very much.
                {"framecfg 0 0 100 500 1 0 \ n \ R"}
The complete configuration is shown in the following figure: