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This is believed to be a feature of the WRITE_PERI_REG(PERIPHS_IO_MUX_MTDO_U, orig_bck);
call in AudioOutputI2SNoDAC.cpp
I don't fully understand the low level registers, but it is believed this tells GPIO15 to be the SPI chip select. The workaround is to call pinMode(15, INPUT); // DTMF decoder pins after the call to the above.
When I call
out = new AudioOutputI2SNoDAC();
it appears to do something to pin D8 (GPIO15). It doesn't seem to function well as an input after this call.
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