ESP32: better config for PDM

Author: tomcombriat

internal/config_checks_esp32.h

@@ -130,7 +130,7 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED, MOZZI_OUTPU
 MOZZI_CHECK_SUPPORTED(MOZZI_ANALOG_READ, MOZZI_ANALOG_READ_NONE)
 MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_INPUT, MOZZI_AUDIO_INPUT_NONE)
 
-#if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC, MOZZI_OUTPUT_PDM_VIA_I2S)
+#if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC)
 #  if !defined(MOZZI_I2S_FORMAT)
 #    define MOZZI_I2S_FORMAT MOZZI_I2S_FORMAT_PLAIN
 #  endif
@@ -161,6 +161,27 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_INPUT, MOZZI_AUDIO_INPUT_NONE)
 #  endif
 #endif
 
+#if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC, MOZZI_OUTPUT_PDM_VIA_I2S)
+#  if !defined(MOZZI_I2S_FORMAT)
+#    define MOZZI_I2S_FORMAT MOZZI_I2S_FORMAT_PLAIN
+#  endif
+#  if !defined(MOZZI_I2S_PIN_BCK)
+#    define MOZZI_I2S_PIN_BCK I2S_GPIO_UNUSED
+#  endif
+#  if !defined(MOZZI_I2S_PIN_WS)
+#    define MOZZI_I2S_PIN_WS I2S_GPIO_UNUSED
+#  endif
+#  if !defined(MOZZI_I2S_PIN_DATA)
+#    define MOZZI_I2S_PIN_DATA 33
+#  endif
+#  if !defined(MOZZI_I2S_PIN_MCLK)
+#    define MOZZI_I2S_PIN_MCLK I2S_GPIO_UNUSED
+#  endif
+#  define MOZZI_I2S_WS_INV 0 // unused but need to be defined
+#  define MOZZI_I2S_BCK_INV 0
+#  define MOZZI_I2S_MBCK_INV 0
+#endif
+
 #if MOZZI_IS(MOZZI_AUDIO_MODE/*, MOZZI_OUTPUT_INTERNAL_DAC*/, MOZZI_OUTPUT_I2S_DAC, MOZZI_OUTPUT_PDM_VIA_I2S)
 //#  include <driver/i2s.h>
 #  if !defined(MOZZI_IS2_PORT)