@erich
Thank you for your suggestion. I downloaded and ran the EasyLoader code and my unit runs the Core2_Test with the proper microphone (per the FFT bar graph).
Compiling the code at https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Core/M5Core2/Arduino/Core2_Factory_Test
When I run the Core2_Factory_Test I get no microphone indication (and the speaker is silent during the scrolling test phase).
I am assuming I have some misconfiguration in my Ardunio IDE but I don't know where. The following is the compiler messages from when I compile the test program (sorry for the size, I don't know what I can safely edit, except for [many] repeated warning:excess elements in array initializer):
C:\Users\jld\Documents\Arduino\Core2_Factory_test\SettingAppImage.c:3169:56: warning: excess elements in array initializer
C:\Users\jld\Documents\Arduino\Core2_Factory_test\Core2_Factory_test.ino: In function 'bool InitI2SSpakerOrMic(int)':
C:\Users\jld\Documents\Arduino\Core2_Factory_test\Core2_Factory_test.ino:291:33: warning: 'I2S_COMM_FORMAT_I2S' is deprecated [-Wdeprecated-declarations]
.communication_format = I2S_COMM_FORMAT_I2S,
^~~~~~~~~~~~~~~~~~~
In file included from C:\Users\jld\AppData\Local\Arduino15\packages\m5stack\hardware\esp32\2.0.1/tools/sdk/esp32/include/driver/include/driver/i2s.h:16,
from C:\Users\jld\Documents\Arduino\Core2_Factory_test\Core2_Factory_test.ino:2:
C:\Users\jld\AppData\Local\Arduino15\packages\m5stack\hardware\esp32\2.0.1/tools/sdk/esp32/include/hal/include/hal/i2s_types.h:95:5: note: declared here
I2S_COMM_FORMAT_I2S attribute((deprecated)) = 0x01, /!< I2S communication format I2S, correspond to I2S_COMM_FORMAT_STAND_I2S/
^~~~~~~~~~~~~~~~~~~
Sketch uses 1360173 bytes (20%) of program storage space. Maximum is 6553600 bytes.
Global variables use 49368 bytes (1%) of dynamic memory, leaving 4472616 bytes for local variables. Maximum is 4521984 bytes.