diff --git a/ports/nrf/common-hal/audiobusio/I2SOut.c b/ports/nrf/common-hal/audiobusio/I2SOut.c
new file mode 100644
index 0000000000..8be1fb2f8c
--- /dev/null
+++ b/ports/nrf/common-hal/audiobusio/I2SOut.c
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/audiobusio/I2SOut.h"
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t* self,
+        const mcu_pin_obj_t* bit_clock, const mcu_pin_obj_t* word_select,
+        const mcu_pin_obj_t* data, bool left_justified) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+bool common_hal_audiobusio_i2sout_deinited(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_audiobusio_i2sout_deinit(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_audiobusio_i2sout_play(audiobusio_i2sout_obj_t* self,
+                                       mp_obj_t sample, bool loop) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_audiobusio_i2sout_pause(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_audiobusio_i2sout_resume(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+bool common_hal_audiobusio_i2sout_get_paused(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_audiobusio_i2sout_stop(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+bool common_hal_audiobusio_i2sout_get_playing(audiobusio_i2sout_obj_t* self) {
+    mp_raise_NotImplementedError(NULL);
+}
diff --git a/ports/nrf/common-hal/audiobusio/I2SOut.h b/ports/nrf/common-hal/audiobusio/I2SOut.h
new file mode 100644
index 0000000000..01c944e721
--- /dev/null
+++ b/ports/nrf/common-hal/audiobusio/I2SOut.h
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOBUSIO_I2SOUT_H
+#define MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOBUSIO_I2SOUT_H
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+} audiobusio_i2sout_obj_t;
+
+#endif // MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOBUSIO_I2SOUT_H
diff --git a/ports/nrf/common-hal/audiobusio/PDMIn.c b/ports/nrf/common-hal/audiobusio/PDMIn.c
new file mode 100644
index 0000000000..5dab75354f
--- /dev/null
+++ b/ports/nrf/common-hal/audiobusio/PDMIn.c
@@ -0,0 +1,64 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/audiobusio/PDMIn.h"
+
+#include "py/runtime.h"
+
+void common_hal_audiobusio_pdmin_construct(audiobusio_pdmin_obj_t* self,
+                                           const mcu_pin_obj_t* clock_pin,
+                                           const mcu_pin_obj_t* data_pin,
+                                           uint32_t sample_rate,
+                                           uint8_t bit_depth,
+                                           bool mono,
+                                           uint8_t oversample) {
+    mp_raise_RuntimeError(translate("not implemented"));
+}
+
+bool common_hal_audiobusio_pdmin_deinited(audiobusio_pdmin_obj_t* self) {
+    mp_raise_RuntimeError(translate("not implemented"));
+}
+
+void common_hal_audiobusio_pdmin_deinit(audiobusio_pdmin_obj_t* self) {
+    mp_raise_RuntimeError(translate("not implemented"));
+}
+
+uint8_t common_hal_audiobusio_pdmin_get_bit_depth(audiobusio_pdmin_obj_t* self) {
+    return self->bit_depth;
+}
+
+uint32_t common_hal_audiobusio_pdmin_get_sample_rate(audiobusio_pdmin_obj_t* self) {
+    return self->sample_rate;
+}
+
+uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* self,
+        uint16_t* output_buffer, uint32_t output_buffer_length) {
+    mp_raise_RuntimeError(translate("not implemented"));
+}
+
+void common_hal_audiobusio_pdmin_record_to_file(audiobusio_pdmin_obj_t* self, uint8_t* buffer, uint32_t length) {
+    mp_raise_RuntimeError(translate("not implemented"));
+}
diff --git a/ports/nrf/common-hal/audiobusio/PDMIn.h b/ports/nrf/common-hal/audiobusio/PDMIn.h
new file mode 100644
index 0000000000..c43d53d0d9
--- /dev/null
+++ b/ports/nrf/common-hal/audiobusio/PDMIn.h
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOBUSIO_AUDIOOUT_H
+#define MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOBUSIO_AUDIOOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    const mcu_pin_obj_t *clock_pin;
+    const mcu_pin_obj_t *data_pin;
+    uint32_t sample_rate;
+    uint8_t bytes_per_sample;
+    uint8_t bit_depth;
+} audiobusio_pdmin_obj_t;
+
+#endif
diff --git a/ports/nrf/common-hal/audiobusio/__init__.c b/ports/nrf/common-hal/audiobusio/__init__.c
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/ports/nrf/mpconfigport.mk b/ports/nrf/mpconfigport.mk
index 57879bbaae..55920b3f4a 100644
--- a/ports/nrf/mpconfigport.mk
+++ b/ports/nrf/mpconfigport.mk
@@ -14,9 +14,7 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_AUDIOCORE = 1
 CIRCUITPY_AUDIOIO = 0
 CIRCUITPY_AUDIOPWMIO = 1
-
-# No I2S yet.
-CIRCUITPY_AUDIOBUSIO = 0
+CIRCUITPY_AUDIOBUSIO = 1
 
 # No I2CSlave implementation
 CIRCUITPY_I2CSLAVE = 0