AR pin config: SCK == 1 --> PDM microphone

Author: softhack007

usermods/audioreactive/audio_reactive.h

@@ -1121,6 +1121,11 @@ class AudioReactive : public Usermod {
       delay(100);         // Give that poor microphone some time to setup.
 
       useBandPassFilter = false;
+
+      #if !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
+        if ((i2sckPin == I2S_PIN_NO_CHANGE) && (i2ssdPin >= 0) && (i2swsPin >= 0) && ((dmType == 1) || (dmType == 4)) ) dmType = 5;   // dummy user support: SCK == -1 --means--> PDM microphone
+      #endif
+
       switch (dmType) {
       #if defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S3)
         // stub cases for not-yet-supported I2S modes on other ESP32 chips