Based seedvpm642_edma_aic23.l64 and c6x1x_edma_mcasp.l64 achieve 4 channel audio capture and playback

03. Audio Loopback_v3.3\echo\bin\evmdm642_echo.out
.......................\....\echo.wks
.......................\....\evmdm642_echo.cdb
.......................\....\evmdm642_echo.cmd
.......................\....\evmdm642_echo.paf2
.......................\....\evmdm642_echo.pjt
.......................\....\evmdm642_echo.sbl
.......................\....\evmdm642_echo.tcf
.......................\....\evmdm642_echo.tco
.......................\....\include\aic23.h
.......................\....\.......\c6x1x_edma_mcasp.h
.......................\....\.......\evmdm642_edma_aic23.h
.......................\....\.......\seeddm642.h
.......................\....\lib\c6x1x_edma_mcasp.l64
.......................\....\...\cslDM642.lib
.......................\....\...\rts6400.lib
.......................\....\...\seedvpm642bsl.lib
.......................\....\...\seedvpm642_edma_aic23.l64
.......................\....\release\evmdm642_echo.out
.......................\....\src\boot.asm
.......................\....\...\main.c
.......................\....\bin
.......................\....\include
.......................\....\lib
.......................\....\release
.......................\....\src
.......................\echo
03. Audio Loopback_v3.3

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