Merge pull request #3733 from jepler/audioout-esp32

esp32s2: Add I2SAudioOut

22 files changed, 853 insertions, 9 deletions

diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 5a8c60763..e8ac7512a 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -113,6 +113,11 @@ msgstr ""
 msgid "%q() takes %d positional arguments but %d were given"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+#, c-format
+msgid "%s error 0x%x"
+msgstr ""
+
 #: py/argcheck.c
 msgid "'%q' argument required"
 msgstr ""
@@ -539,6 +544,10 @@ msgstr ""
 msgid "CBC blocks must be multiples of 16 bytes"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "CRC or checksum was invalid"
+msgstr ""
+
 #: py/objtype.c
 msgid "Call super().__init__() before accessing native object."
 msgstr ""
@@ -987,6 +996,10 @@ msgstr ""
 msgid "Function requires lock"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Generic Failure"
+msgstr ""
+
 #: shared-bindings/displayio/Display.c
 #: shared-bindings/displayio/EPaperDisplay.c
 #: shared-bindings/framebufferio/FramebufferDisplay.c
@@ -1113,6 +1126,7 @@ msgstr ""
 msgid "Invalid Pin"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
 #: py/moduerrno.c shared-module/rgbmatrix/RGBMatrix.c
 msgid "Invalid argument"
 msgstr ""
@@ -1222,6 +1236,14 @@ msgstr ""
 msgid "Invalid security_mode"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Invalid size"
+msgstr ""
+
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Invalid state"
+msgstr ""
+
 #: shared-bindings/audiomixer/Mixer.c
 msgid "Invalid voice"
 msgstr ""
@@ -1262,6 +1284,10 @@ msgstr ""
 msgid "Length must be non-negative"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "MAC address was invalid"
+msgstr ""
+
 #: shared-module/bitbangio/SPI.c
 msgid "MISO pin init failed."
 msgstr ""
@@ -1504,6 +1530,18 @@ msgstr ""
 msgid "Only raw int supported for ip"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Operation or feature not supported"
+msgstr ""
+
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Operation timed out"
+msgstr ""
+
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Out of memory"
+msgstr ""
+
 #: ports/esp32s2/common-hal/socketpool/SocketPool.c
 msgid "Out of sockets"
 msgstr ""
@@ -1512,6 +1550,10 @@ msgstr ""
 msgid "Oversample must be multiple of 8."
 msgstr ""
 
+#: shared-bindings/audiobusio/PDMIn.c
+msgid "PDMIn not available"
+msgstr ""
+
 #: shared-bindings/pwmio/PWMOut.c
 msgid ""
 "PWM duty_cycle must be between 0 and 65535 inclusive (16 bit resolution)"
@@ -1528,6 +1570,10 @@ msgstr ""
 msgid "ParallelBus not yet supported"
 msgstr ""
 
+#: ports/esp32s2/common-hal/audiobusio/__init__.c
+msgid "Peripheral in use"
+msgstr ""
+
 #: py/moduerrno.c
 msgid "Permission denied"
 msgstr ""
@@ -1645,6 +1691,10 @@ msgstr ""
 msgid "Read-only object"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Received response was invalid"
+msgstr ""
+
 #: shared-bindings/displayio/EPaperDisplay.c
 msgid "Refresh too soon"
 msgstr ""
@@ -1657,6 +1707,10 @@ msgstr ""
 msgid "Requested AES mode is unsupported"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Requested resource not found"
+msgstr ""
+
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 msgid "Right channel unsupported"
 msgstr ""
@@ -2027,6 +2081,10 @@ msgstr ""
 msgid "Value length > max_length"
 msgstr ""
 
+#: ports/esp32s2/bindings/espidf/__init__.c ports/esp32s2/esp_error.c
+msgid "Version was invalid"
+msgstr ""
+
 #: py/emitnative.c
 msgid "Viper functions don't currently support more than 4 arguments"
 msgstr ""
@@ -3869,6 +3927,10 @@ msgstr ""
 msgid "x value out of bounds"
 msgstr ""
 
+#: ports/esp32s2/common-hal/audiobusio/__init__.c
+msgid "xTaskCreate failed"
+msgstr ""
+
 #: shared-bindings/displayio/Shape.c
 msgid "y should be an int"
 msgstr ""
diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
index f33a1d2eb..9827b555c 100644
--- a/ports/esp32s2/Makefile
+++ b/ports/esp32s2/Makefile
@@ -299,6 +299,8 @@ ESP_AUTOGEN_LD = $(BUILD)/esp-idf/esp-idf/esp32s2/esp32s2_out.ld $(BUILD)/esp-id
 
 FLASH_FLAGS = --flash_mode $(CIRCUITPY_ESP_FLASH_MODE) --flash_freq $(CIRCUITPY_ESP_FLASH_FREQ) --flash_size $(CIRCUITPY_ESP_FLASH_SIZE)
 
+ESPTOOL_FLAGS ?= -b 460800 --before=default_reset --after=no_reset write_flash
+
 all: $(BUILD)/firmware.bin $(BUILD)/firmware.uf2
 
 .PHONY: esp-idf-stamp
@@ -337,10 +339,10 @@ $(BUILD)/firmware.uf2: $(BUILD)/circuitpython-firmware.bin
 	$(Q)$(PYTHON3) $(TOP)/tools/uf2/utils/uf2conv.py -f 0xbfdd4eee -b 0x0000 -c -o $@ $^
 
 flash: $(BUILD)/firmware.bin
-	esptool.py --chip esp32s2 -p $(PORT) -b 460800 --before=default_reset --after=no_reset write_flash $(FLASH_FLAGS) 0x0000 $^
+	esptool.py --chip esp32s2 -p $(PORT) $(ESPTOOL_FLAGS) write_flash $(FLASH_FLAGS) 0x0000 $^
 
 flash-circuitpython-only: $(BUILD)/circuitpython-firmware.bin
-	esptool.py --chip esp32s2 -p $(PORT) -b 460800 --before=default_reset --after=no_reset write_flash $(FLASH_FLAGS) 0x10000 $^
+	esptool.py --chip esp32s2 -p $(PORT) $(ESPTOOL_FLAGS) write_flash $(FLASH_FLAGS) 0x10000 $^
 
 include $(TOP)/py/mkrules.mk
 
diff --git a/ports/esp32s2/bindings/espidf/__init__.c b/ports/esp32s2/bindings/espidf/__init__.c
index 554bfaa39..708c30c39 100644
--- a/ports/esp32s2/bindings/espidf/__init__.c
+++ b/ports/esp32s2/bindings/espidf/__init__.c
@@ -65,12 +65,12 @@ STATIC mp_obj_t espidf_heap_caps_get_largest_free_block(void) {
 }
 MP_DEFINE_CONST_FUN_OBJ_0(espidf_heap_caps_get_largest_free_block_obj, espidf_heap_caps_get_largest_free_block);
 
-//| class MemoryError(MemoryError):
-//|     """Raised when an ESP IDF memory allocation fails."""
+//| class IDFError(OSError):
+//|     """Raised for certain generic ESP IDF errors."""
 //|     ...
 //|
-NORETURN void mp_raise_espidf_MemoryError(void) {
-    nlr_raise(mp_obj_new_exception(&mp_type_espidf_MemoryError));
+NORETURN void mp_raise_espidf_IDFError(void) {
+    nlr_raise(mp_obj_new_exception(&mp_type_espidf_IDFError));
 }
 
 void espidf_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
@@ -83,6 +83,24 @@ void espidf_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kin
     mp_obj_exception_print(print, o_in, kind);
 }
 
+const mp_obj_type_t mp_type_espidf_IDFError = {
+    { &mp_type_type },
+    .name = MP_QSTR_IDFError,
+    .print = espidf_exception_print,
+    .make_new = mp_obj_exception_make_new,
+    .attr = mp_obj_exception_attr,
+    .parent = &mp_type_OSError,
+};
+
+
+//| class MemoryError(MemoryError):
+//|     """Raised when an ESP IDF memory allocation fails."""
+//|     ...
+//|
+NORETURN void mp_raise_espidf_MemoryError(void) {
+    nlr_raise(mp_obj_new_exception(&mp_type_espidf_MemoryError));
+}
+
 const mp_obj_type_t mp_type_espidf_MemoryError = {
     { &mp_type_type },
     .name = MP_QSTR_MemoryError,
@@ -99,6 +117,7 @@ STATIC const mp_rom_map_elem_t espidf_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_heap_caps_get_free_size), MP_ROM_PTR(&espidf_heap_caps_get_free_size_obj)},
     { MP_ROM_QSTR(MP_QSTR_heap_caps_get_largest_free_block), MP_ROM_PTR(&espidf_heap_caps_get_largest_free_block_obj)},
 
+    { MP_ROM_QSTR(MP_QSTR_IDFError), MP_ROM_PTR(&mp_type_espidf_IDFError) },
     { MP_ROM_QSTR(MP_QSTR_MemoryError),      MP_ROM_PTR(&mp_type_espidf_MemoryError) },
 };
 
@@ -108,3 +127,64 @@ const mp_obj_module_t espidf_module = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t*)&espidf_module_globals,
 };
+
+void raise_esp_error(esp_err_t err) {
+    const compressed_string_t *msg = NULL;
+    const mp_obj_type_t * exception_type = &mp_type_espidf_IDFError;
+    switch(err) {
+        case ESP_FAIL:
+            msg = translate("Generic Failure");
+            break;
+        case ESP_ERR_NO_MEM:
+            exception_type = &mp_type_espidf_MemoryError;
+            msg = translate("Out of memory");
+            break;
+        case ESP_ERR_INVALID_ARG:
+            msg = translate("Invalid argument");
+            break;
+        case ESP_ERR_INVALID_STATE:
+            msg = translate("Invalid state");
+            break;
+        case ESP_ERR_INVALID_SIZE:
+            msg = translate("Invalid size");
+            break;
+        case ESP_ERR_NOT_FOUND:
+            msg = translate("Requested resource not found");
+            break;
+        case ESP_ERR_NOT_SUPPORTED:
+            msg = translate("Operation or feature not supported");
+            break;
+        case ESP_ERR_TIMEOUT:
+            msg = translate("Operation timed out");
+            break;
+        case ESP_ERR_INVALID_RESPONSE:
+            msg = translate("Received response was invalid");
+            break;
+        case ESP_ERR_INVALID_CRC:
+            msg = translate("CRC or checksum was invalid");
+            break;
+        case ESP_ERR_INVALID_VERSION:
+            msg = translate("Version was invalid");
+            break;
+        case ESP_ERR_INVALID_MAC:
+            msg = translate("MAC address was invalid");
+            break;
+    }
+    if (msg) {
+        mp_raise_msg(exception_type, msg);
+    }
+
+    const char *group = "ESP-IDF";
+
+    // tests must be in descending order
+    MP_STATIC_ASSERT( ESP_ERR_FLASH_BASE > ESP_ERR_MESH_BASE );
+    MP_STATIC_ASSERT( ESP_ERR_MESH_BASE > ESP_ERR_WIFI_BASE );
+    if(err >= ESP_ERR_FLASH_BASE) {
+        group = "Flash";
+    } else if (err >= ESP_ERR_MESH_BASE) {
+        group = "Mesh";
+    } else if (err >= ESP_ERR_WIFI_BASE) {
+        group = "WiFi";
+    }
+    mp_raise_msg_varg(exception_type, translate("%s error 0x%x"), group, err);
+}
diff --git a/ports/esp32s2/bindings/espidf/__init__.h b/ports/esp32s2/bindings/espidf/__init__.h
index 356c1c814..9248b01ac 100644
--- a/ports/esp32s2/bindings/espidf/__init__.h
+++ b/ports/esp32s2/bindings/espidf/__init__.h
@@ -27,8 +27,16 @@
 #ifndef MICROPY_INCLUDED_ESP32S2_BINDINGS_ESPIDF___INIT___H
 #define MICROPY_INCLUDED_ESP32S2_BINDINGS_ESPIDF___INIT___H
 
+#include "esp_err.h"
+#include "py/mpconfig.h"
+#include "py/obj.h"
+
+extern const mp_obj_type_t mp_type_espidf_IDFError;
 extern const mp_obj_type_t mp_type_espidf_MemoryError;
 
 NORETURN void mp_raise_espidf_MemoryError(void);
 
+void raise_esp_error(esp_err_t err) NORETURN;
+#define CHECK_ESP_RESULT(x) do { int res = (x); if(res != ESP_OK) raise_esp_error(res); } while(0)
+
 #endif  // MICROPY_INCLUDED_ESP32S2_BINDINGS_ESPIDF___INIT___H
diff --git a/ports/esp32s2/common-hal/audiobusio/I2SOut.c b/ports/esp32s2/common-hal/audiobusio/I2SOut.c
new file mode 100644
index 000000000..86322be86
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/I2SOut.c
@@ -0,0 +1,126 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 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 <stdint.h>
+#include <string.h>
+
+#include "mpconfigport.h"
+
+#include "bindings/espidf/__init__.h"
+
+// Some boards don't implement I2SOut, so suppress any routines from here.
+#if CIRCUITPY_AUDIOBUSIO_I2SOUT
+
+#include "extmod/vfs_fat.h"
+#include "py/gc.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "common-hal/audiobusio/I2SOut.h"
+#include "shared-bindings/audiobusio/I2SOut.h"
+#include "shared-bindings/audiocore/RawSample.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "supervisor/shared/translate.h"
+
+#include "driver/i2s.h"
+
+// Caller validates that pins are free.
+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) {
+
+    port_i2s_allocate_init(&self->peripheral, left_justified);
+
+    i2s_pin_config_t i2s_pin_config = {
+        .bck_io_num = bit_clock->number,
+        .ws_io_num = word_select->number,
+        .data_out_num = data->number,
+        .data_in_num = I2S_PIN_NO_CHANGE,
+    };
+    CHECK_ESP_RESULT(i2s_set_pin(self->peripheral.instance, &i2s_pin_config));
+    self->bit_clock = bit_clock;
+    self->word_select = word_select;
+    self->data = data;
+}
+
+bool common_hal_audiobusio_i2sout_deinited(audiobusio_i2sout_obj_t* self) {
+    return self->peripheral.instance == -1;
+}
+
+void common_hal_audiobusio_i2sout_deinit(audiobusio_i2sout_obj_t* self) {
+    if (common_hal_audiobusio_i2sout_deinited(self)) {
+        return;
+    }
+
+    if (self->bit_clock) {
+        reset_pin_number(self->bit_clock->number);
+    }
+    self->bit_clock = NULL;
+
+    if (self->word_select) {
+        reset_pin_number(self->word_select->number);
+    }
+    self->word_select = NULL;
+
+    if (self->data) {
+        reset_pin_number(self->data->number);
+    }
+    self->data = NULL;
+
+    if (self->peripheral.instance >= 0) {
+        port_i2s_reset_instance(self->peripheral.instance);
+    }
+    self->peripheral.instance = -1;
+}
+
+void common_hal_audiobusio_i2sout_play(audiobusio_i2sout_obj_t* self,
+                                       mp_obj_t sample, bool loop) {
+    if (common_hal_audiobusio_i2sout_get_playing(self)) {
+        common_hal_audiobusio_i2sout_stop(self);
+    }
+    port_i2s_play(&self->peripheral, sample, loop);
+}
+
+void common_hal_audiobusio_i2sout_pause(audiobusio_i2sout_obj_t* self) {
+    port_i2s_pause(&self->peripheral);
+}
+
+void common_hal_audiobusio_i2sout_resume(audiobusio_i2sout_obj_t* self) {
+    port_i2s_resume(&self->peripheral);
+}
+
+bool common_hal_audiobusio_i2sout_get_paused(audiobusio_i2sout_obj_t* self) {
+    return port_i2s_paused(&self->peripheral);
+}
+
+void common_hal_audiobusio_i2sout_stop(audiobusio_i2sout_obj_t* self) {
+    port_i2s_stop(&self->peripheral);
+}
+
+bool common_hal_audiobusio_i2sout_get_playing(audiobusio_i2sout_obj_t* self) {
+    return port_i2s_playing(&self->peripheral);
+}
+
+#endif // CIRCUITPY_AUDIOBUSIO_I2SOUT
diff --git a/ports/esp32s2/common-hal/audiobusio/I2SOut.h b/ports/esp32s2/common-hal/audiobusio/I2SOut.h
new file mode 100644
index 000000000..891e9af67
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/I2SOut.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 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.
+ */
+
+#pragma once
+
+#include "supervisor/background_callback.h"
+#include "common-hal/microcontroller/Pin.h"
+
+#include "common-hal/audiobusio/__init__.h"
+
+// Some boards don't implement I2SOut, so suppress any routines from here.
+#if CIRCUITPY_AUDIOBUSIO_I2SOUT
+
+typedef struct {
+    mp_obj_base_t base;
+    i2s_t peripheral;
+    const mcu_pin_obj_t *bit_clock;
+    const mcu_pin_obj_t *word_select;
+    const mcu_pin_obj_t *data;
+} audiobusio_i2sout_obj_t;
+
+#endif
diff --git a/ports/esp32s2/common-hal/audiobusio/PDMIn.c b/ports/esp32s2/common-hal/audiobusio/PDMIn.c
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/PDMIn.c
diff --git a/ports/esp32s2/common-hal/audiobusio/PDMIn.h b/ports/esp32s2/common-hal/audiobusio/PDMIn.h
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/PDMIn.h
diff --git a/ports/esp32s2/common-hal/audiobusio/__init__.c b/ports/esp32s2/common-hal/audiobusio/__init__.c
new file mode 100644
index 000000000..01c77c531
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/__init__.c
@@ -0,0 +1,245 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 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 <string.h>
+
+#include "py/runtime.h"
+
+#include "common-hal/audiobusio/__init__.h"
+#include "bindings/espidf/__init__.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "shared-module/audiocore/__init__.h"
+
+#define I2S_QUEUE_SIZE (3)
+
+static i2s_t *i2s_instance[I2S_NUM_MAX];
+static QueueHandle_t i2s_queues[I2S_NUM_MAX];
+static TaskHandle_t i2s_tasks[I2S_NUM_MAX];
+
+static int8_t port_i2s_allocate(void) {
+#if defined(I2S_NUM_1)
+    if(!i2s_instance[1]) return 1;
+#endif
+    if(!i2s_instance[0]) return 0;
+
+    mp_raise_RuntimeError(translate("Peripheral in use"));
+}
+
+void port_i2s_reset_instance(int i) {
+    assert(i >= 0 && i < I2S_NUM_MAX);
+    if (i2s_tasks[i]) {
+        vTaskDelete(i2s_tasks[i]);
+    }
+    i2s_tasks[i] = NULL;
+
+    (void)i2s_driver_uninstall(i);
+    i2s_instance[i] = NULL;
+}
+
+void i2s_reset(void) {
+    for (int i=0; i < I2S_NUM_MAX; i++) {
+        port_i2s_reset_instance(i);
+    }
+}
+
+static void i2s_fill_buffer(i2s_t *self) {
+    if (self->instance < 0 || self->instance >= I2S_NUM_MAX) {
+        return;
+    }
+#define STACK_BUFFER_SIZE (512)
+    int16_t signed_samples[STACK_BUFFER_SIZE / sizeof(int16_t)];
+
+    if (!self->playing || self->paused || !self->sample || self->stopping) {
+        memset(signed_samples, 0, sizeof(signed_samples));
+
+        size_t bytes_written = 0;
+        do {
+            CHECK_ESP_RESULT(i2s_write(self->instance, signed_samples, sizeof(signed_samples), &bytes_written, 0));
+        } while (bytes_written != 0);
+        return;
+    }
+    while (!self->stopping) {
+        if (self->sample_data == self->sample_end) {
+            uint32_t sample_buffer_length;
+            audioio_get_buffer_result_t get_buffer_result =
+                audiosample_get_buffer(self->sample, false, 0,
+                                       &self->sample_data, &sample_buffer_length);
+            self->sample_end = self->sample_data + sample_buffer_length;
+            if (get_buffer_result == GET_BUFFER_DONE) {
+                if (self->loop) {
+                    audiosample_reset_buffer(self->sample, false, 0);
+                } else {
+                    self->stopping = true;
+                    break;
+                }
+            }
+            if (get_buffer_result == GET_BUFFER_ERROR || sample_buffer_length == 0) {
+                self->stopping = true;
+                break;
+            }
+        }
+        size_t bytes_written = 0;
+        size_t bytecount = self->sample_end - self->sample_data;
+        if (self->samples_signed && self->channel_count == 2) {
+            if (self->bytes_per_sample == 2) {
+                CHECK_ESP_RESULT(i2s_write(self->instance, self->sample_data, bytecount, &bytes_written, 0));
+            } else {
+                CHECK_ESP_RESULT(i2s_write_expand(self->instance, self->sample_data, bytecount, 8, 16, &bytes_written, 0));
+            }
+        } else {
+            const size_t bytes_per_output_frame = 4;
+            size_t bytes_per_input_frame = self->channel_count * self->bytes_per_sample;
+            size_t framecount = MIN(STACK_BUFFER_SIZE / bytes_per_output_frame, bytecount / bytes_per_input_frame);
+            if (self->samples_signed) {
+                assert(self->channel_count == 1);
+                if (self->bytes_per_sample == 1) {
+                    audiosample_convert_s8m_s16s(signed_samples, (int8_t*)(void*)self->sample_data, framecount);
+                } else {
+                    audiosample_convert_s16m_s16s(signed_samples, (int16_t*)(void*)self->sample_data, framecount);
+                }
+            } else {
+                if (self->channel_count == 1) {
+                    if (self->bytes_per_sample == 1) {
+                        audiosample_convert_u8m_s16s(signed_samples, (uint8_t*)(void*)self->sample_data, framecount);
+                    } else {
+                        audiosample_convert_u16m_s16s(signed_samples, (uint16_t*)(void*)self->sample_data, framecount);
+                    }
+                } else {
+                    if (self->bytes_per_sample == 1) {
+                        audiosample_convert_u8s_s16s(signed_samples, (uint8_t*)(void*)self->sample_data, framecount);
+                    } else {
+                        audiosample_convert_u16s_s16s(signed_samples, (uint16_t*)(void*)self->sample_data, framecount);
+                    }
+                }
+            }
+            size_t expanded_bytes_written = 0;
+            CHECK_ESP_RESULT(i2s_write(self->instance, signed_samples, bytes_per_output_frame*framecount, &expanded_bytes_written, 0));
+            assert(expanded_bytes_written % 4 == 0);
+            bytes_written = expanded_bytes_written / bytes_per_output_frame * bytes_per_input_frame;
+        }
+        self->sample_data += bytes_written;
+        // We have filled the DMA buffer
+        if (!bytes_written) {
+            break;
+        }
+    }
+}
+
+static void i2s_callback_fun(void *self_in) {
+    i2s_t *self = self_in;
+    i2s_fill_buffer(self);
+}
+
+static void i2s_event_task(void *self_in) {
+    i2s_t *self = self_in;
+    while(true) {
+        i2s_event_type_t event;
+        BaseType_t result = xQueueReceive(i2s_queues[self->instance], &event, portMAX_DELAY);
+        if (result && event == I2S_EVENT_TX_DONE) {
+            background_callback_add(&self->callback, i2s_callback_fun, self_in);
+        }
+    }
+}
+
+void port_i2s_allocate_init(i2s_t *self, bool left_justified) {
+    self->instance = port_i2s_allocate();
+
+    i2s_config_t i2s_config = {
+        .mode = I2S_MODE_MASTER | I2S_MODE_TX,
+        .sample_rate = 44100,
+        .bits_per_sample = 16,
+        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
+        .communication_format = left_justified ? I2S_COMM_FORMAT_STAND_I2S : I2S_COMM_FORMAT_STAND_I2S,
+        .dma_buf_count = 2,
+        .dma_buf_len = 128, // in _frames_, so 128 is 512 bytes per dma buf
+        .use_apll = false,
+    };
+    CHECK_ESP_RESULT(i2s_driver_install(self->instance, &i2s_config, I2S_QUEUE_SIZE, &i2s_queues[self->instance]));
+
+    if (!xTaskCreate(i2s_event_task, "I2S_task", 3 * configMINIMAL_STACK_SIZE, self, CONFIG_PTHREAD_TASK_PRIO_DEFAULT, &i2s_tasks[self->instance])) {
+        mp_raise_OSError_msg(translate("xTaskCreate failed"));
+    }
+    i2s_instance[self->instance] = self;
+
+}
+
+
+void port_i2s_play(i2s_t *self, mp_obj_t sample, bool loop) {
+    self->sample = sample;
+    self->loop = loop;
+    self->bytes_per_sample = audiosample_bits_per_sample(sample) / 8;
+    self->channel_count = audiosample_channel_count(sample);
+    bool single_buffer;
+    bool samples_signed;
+    uint32_t max_buffer_length;
+    uint8_t spacing;
+    audiosample_get_buffer_structure(sample, false, &single_buffer, &samples_signed,
+                                     &max_buffer_length, &spacing);
+    self->samples_signed = samples_signed;
+    self->playing = true;
+    self->paused = false;
+    self->stopping = false;
+    self->sample_data = self->sample_end = NULL;
+    // We always output stereo so output twice as many bits.
+    // uint16_t bits_per_sample_output = bits_per_sample * 2;
+
+    audiosample_reset_buffer(self->sample, false, 0);
+
+    CHECK_ESP_RESULT(i2s_set_sample_rates(self->instance, audiosample_sample_rate(sample)));
+
+    background_callback_add(&self->callback, i2s_callback_fun, self);
+}
+
+bool port_i2s_playing(i2s_t *self) {
+    return self->playing && !self->stopping;
+}
+
+bool port_i2s_paused(i2s_t *self) {
+    return self->paused;
+}
+
+void port_i2s_stop(i2s_t *self) {
+    self->sample = NULL;
+    self->paused = false;
+    self->playing = false;
+    self->stopping = false;
+}
+
+void port_i2s_pause(i2s_t *self) {
+    if (!self->paused) {
+        self->paused = true;
+        CHECK_ESP_RESULT(i2s_stop(self->instance));
+    }
+}
+
+void port_i2s_resume(i2s_t *self) {
+    if (self->paused) {
+        self->paused = false;
+        CHECK_ESP_RESULT(i2s_start(self->instance));
+    }
+}
diff --git a/ports/esp32s2/common-hal/audiobusio/__init__.h b/ports/esp32s2/common-hal/audiobusio/__init__.h
new file mode 100644
index 000000000..7709735da
--- /dev/null
+++ b/ports/esp32s2/common-hal/audiobusio/__init__.h
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 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.
+ */
+
+#pragma once
+
+#include "py/obj.h"
+
+#include "supervisor/background_callback.h"
+
+#include "driver/i2s.h"
+
+typedef struct {
+    mp_obj_t *sample;
+    bool left_justified;
+    bool loop;
+    bool paused;
+    bool playing;
+    bool stopping;
+    bool samples_signed;
+    int8_t bytes_per_sample;
+    int8_t channel_count;
+    int8_t instance;
+    uint16_t buffer_length;
+    uint8_t *sample_data, *sample_end;
+    i2s_config_t i2s_config;
+    background_callback_t callback;
+} i2s_t;
+
+
+void port_i2s_allocate_init(i2s_t *self, bool left_justified);
+void port_i2s_reset_instance(int i);
+void i2s_reset(void);
+void port_i2s_play(i2s_t *self, mp_obj_t sample, bool loop);
+void port_i2s_stop(i2s_t *self);
+bool port_i2s_playing(i2s_t *self);
+bool port_i2s_paused(i2s_t *self);
+void port_i2s_pause(i2s_t *self);
+void port_i2s_resume(i2s_t *self);
diff --git a/ports/esp32s2/esp-idf-config/sdkconfig-debug.defaults b/ports/esp32s2/esp-idf-config/sdkconfig-debug.defaults
index f45f6ae9f..b108532aa 100644
--- a/ports/esp32s2/esp-idf-config/sdkconfig-debug.defaults
+++ b/ports/esp32s2/esp-idf-config/sdkconfig-debug.defaults
@@ -10,4 +10,7 @@ CONFIG_ESP_CONSOLE_UART_BAUDRATE=115200
 CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
 # CONFIG_ESP_SYSTEM_PANIC_PRINT_REBOOT is not set
 # CONFIG_ESP_SYSTEM_PANIC_SILENT_REBOOT is not set
-# CONFIG_ESP_SYSTEM_PANIC_GDBSTUB is not set
\ No newline at end of file
+# CONFIG_ESP_SYSTEM_PANIC_GDBSTUB is not set
+CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION_DEBUG=y
+CONFIG_COMPILER_OPTIMIZATION_DEFAULT=y
+CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE=y
\ No newline at end of file
diff --git a/ports/esp32s2/esp_error.c b/ports/esp32s2/esp_error.c
new file mode 100644
index 000000000..57bc51528
--- /dev/null
+++ b/ports/esp32s2/esp_error.c
@@ -0,0 +1,91 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 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 "esp_error.h"
+#include "py/runtime.h"
+
+#include "bindings/espidf/__init__.h"
+
+void raise_esp_error(esp_err_t err) {
+    const compressed_string_t *msg = NULL;
+    const mp_obj_type_t * exception_type = &mp_type_espidf_IDFError;
+    switch(err) {
+        case ESP_FAIL:
+            msg = translate("Generic Failure");
+            break;
+        case ESP_ERR_NO_MEM:
+            exception_type = &mp_type_espidf_MemoryError;
+            msg = translate("Out of memory");
+            break;
+        case ESP_ERR_INVALID_ARG:
+            msg = translate("Invalid argument");
+            break;
+        case ESP_ERR_INVALID_STATE:
+            msg = translate("Invalid state");
+            break;
+        case ESP_ERR_INVALID_SIZE:
+            msg = translate("Invalid size");
+            break;
+        case ESP_ERR_NOT_FOUND:
+            msg = translate("Requested resource not found");
+            break;
+        case ESP_ERR_NOT_SUPPORTED:
+            msg = translate("Operation or feature not supported");
+            break;
+        case ESP_ERR_TIMEOUT:
+            msg = translate("Operation timed out");
+            break;
+        case ESP_ERR_INVALID_RESPONSE:
+            msg = translate("Received response was invalid");
+            break;
+        case ESP_ERR_INVALID_CRC:
+            msg = translate("CRC or checksum was invalid");
+            break;
+        case ESP_ERR_INVALID_VERSION:
+            msg = translate("Version was invalid");
+            break;
+        case ESP_ERR_INVALID_MAC:
+            msg = translate("MAC address was invalid");
+            break;
+    }
+    if (msg) {
+        mp_raise_msg(exception_type, msg);
+    }
+
+    const char *group = "ESP-IDF";
+
+    // tests must be in descending order
+    MP_STATIC_ASSERT( ESP_ERR_FLASH_BASE > ESP_ERR_MESH_BASE );
+    MP_STATIC_ASSERT( ESP_ERR_MESH_BASE > ESP_ERR_WIFI_BASE );
+    if(err >= ESP_ERR_FLASH_BASE) {
+        group = "Flash";
+    } else if (err >= ESP_ERR_MESH_BASE) {
+        group = "Mesh";
+    } else if (err >= ESP_ERR_WIFI_BASE) {
+        group = "WiFi";
+    }
+    mp_raise_msg_varg(exception_type, translate("%s error 0x%x"), group, err);
+}
diff --git a/ports/esp32s2/mpconfigport.mk b/ports/esp32s2/mpconfigport.mk
index 2ad8afb51..562c60998 100644
--- a/ports/esp32s2/mpconfigport.mk
+++ b/ports/esp32s2/mpconfigport.mk
@@ -15,7 +15,11 @@ LONGINT_IMPL = MPZ
 # These modules are implemented in ports/<port>/common-hal:
 CIRCUITPY_FULL_BUILD = 1
 CIRCUITPY_ALARM = 1
-CIRCUITPY_AUDIOBUSIO = 0
+CIRCUITPY_AUDIOCORE = 1
+CIRCUITPY_AUDIOMP3 = 0
+CIRCUITPY_AUDIOBUSIO = 1
+CIRCUITPY_AUDIOBUSIO_PDMIN = 0
+CIRCUITPY_AUDIOBUSIO_I2SOUT = 1
 CIRCUITPY_AUDIOIO = 0
 CIRCUITPY_CANIO = 1
 CIRCUITPY_COUNTIO = 1
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index 213473b8d..6491e7430 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -61,6 +61,10 @@
 #include "components/soc/soc/esp32s2/include/soc/cache_memory.h"
 #include "components/soc/soc/esp32s2/include/soc/rtc_cntl_reg.h"
 
+#if CIRCUITPY_AUDIOBUSIO
+#include "common-hal/audiobusio/__init__.h"
+#endif
+
 #define HEAP_SIZE (48 * 1024)
 
 uint32_t* heap;
@@ -107,6 +111,20 @@ safe_mode_t port_init(void) {
     heap = NULL;
     never_reset_module_internal_pins();
 
+    #if defined(DEBUG)
+    // debug UART
+    common_hal_never_reset_pin(&pin_GPIO43);
+    common_hal_never_reset_pin(&pin_GPIO44);
+    #endif
+
+    #if defined(DEBUG) || defined(ENABLE_JTAG)
+    // JTAG
+    common_hal_never_reset_pin(&pin_GPIO39);
+    common_hal_never_reset_pin(&pin_GPIO40);
+    common_hal_never_reset_pin(&pin_GPIO41);
+    common_hal_never_reset_pin(&pin_GPIO42);
+    #endif
+
     #ifdef CONFIG_SPIRAM
         heap = (uint32_t*) (DRAM0_CACHE_ADDRESS_HIGH - CONFIG_SPIRAM_SIZE);
         heap_size = CONFIG_SPIRAM_SIZE / sizeof(uint32_t);
@@ -153,6 +171,10 @@ void reset_port(void) {
     ps2_reset();
 #endif
 
+#if CIRCUITPY_AUDIOBUSIO
+    i2s_reset();
+#endif
+
 #if CIRCUITPY_PULSEIO
     esp32s2_peripherals_rmt_reset();
     pulsein_reset();
@@ -275,10 +297,14 @@ void port_disable_tick(void) {
     esp_timer_stop(_tick_timer);
 }
 
-void sleep_timer_cb(void* arg) {
+void port_wake_main_task() {
     xTaskNotifyGive(circuitpython_task);
 }
 
+void sleep_timer_cb(void* arg) {
+    port_wake_main_task();
+}
+
 void port_interrupt_after_ticks(uint32_t ticks) {
     uint64_t timeout_us = ticks * 1000000ull / 1024;
     if (esp_timer_start_once(_sleep_timer, timeout_us) != ESP_OK) {
diff --git a/py/circuitpy_mpconfig.mk b/py/circuitpy_mpconfig.mk
index a01da2956..d0145a90f 100644
--- a/py/circuitpy_mpconfig.mk
+++ b/py/circuitpy_mpconfig.mk
@@ -55,6 +55,10 @@ CFLAGS += -DCIRCUITPY_AUDIOBUSIO=$(CIRCUITPY_AUDIOBUSIO)
 CIRCUITPY_AUDIOBUSIO_I2SOUT ?= $(CIRCUITPY_AUDIOBUSIO)
 CFLAGS += -DCIRCUITPY_AUDIOBUSIO_I2SOUT=$(CIRCUITPY_AUDIOBUSIO_I2SOUT)
 
+# Likewise, some boards have I2SOut but do not implement PDMIn.
+CIRCUITPY_AUDIOBUSIO_PDMIN ?= $(CIRCUITPY_AUDIOBUSIO)
+CFLAGS += -DCIRCUITPY_AUDIOBUSIO_PDMIN=$(CIRCUITPY_AUDIOBUSIO_PDMIN)
+
 CIRCUITPY_AUDIOIO ?= $(CIRCUITPY_FULL_BUILD)
 CFLAGS += -DCIRCUITPY_AUDIOIO=$(CIRCUITPY_AUDIOIO)
 
diff --git a/shared-bindings/audiobusio/PDMIn.c b/shared-bindings/audiobusio/PDMIn.c
index 6c5fa7939..a3cc8b07e 100644
--- a/shared-bindings/audiobusio/PDMIn.c
+++ b/shared-bindings/audiobusio/PDMIn.c
@@ -84,6 +84,9 @@
 //|         ...
 //|
 STATIC mp_obj_t audiobusio_pdmin_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+#if !CIRCUITPY_AUDIOBUSIO_PDMIN
+    mp_raise_NotImplementedError(translate("PDMIn not available"));
+#else
     enum { ARG_clock_pin, ARG_data_pin, ARG_sample_rate, ARG_bit_depth, ARG_mono, ARG_oversample, ARG_startup_delay };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_clock_pin,     MP_ARG_REQUIRED | MP_ARG_OBJ },
@@ -132,8 +135,10 @@ STATIC mp_obj_t audiobusio_pdmin_make_new(const mp_obj_type_t *type, size_t n_ar
     mp_hal_delay_ms(startup_delay * 1000);
 
     return MP_OBJ_FROM_PTR(self);
+#endif
 }
 
+#if CIRCUITPY_AUDIOBUSIO_PDMIN
 //|     def deinit(self) -> None:
 //|         """Deinitialises the PDMIn and releases any hardware resources for reuse."""
 //|         ...
@@ -237,10 +242,13 @@ STATIC const mp_rom_map_elem_t audiobusio_pdmin_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&audiobusio_pdmin_sample_rate_obj) }
 };
 STATIC MP_DEFINE_CONST_DICT(audiobusio_pdmin_locals_dict, audiobusio_pdmin_locals_dict_table);
+#endif
 
 const mp_obj_type_t audiobusio_pdmin_type = {
     { &mp_type_type },
     .name = MP_QSTR_PDMIn,
     .make_new = audiobusio_pdmin_make_new,
+#if CIRCUITPY_AUDIOBUSIO_PDMIN
     .locals_dict = (mp_obj_dict_t*)&audiobusio_pdmin_locals_dict,
+#endif
 };
diff --git a/shared-bindings/audiobusio/PDMIn.h b/shared-bindings/audiobusio/PDMIn.h
index c2a8bab2f..e89fc7e23 100644
--- a/shared-bindings/audiobusio/PDMIn.h
+++ b/shared-bindings/audiobusio/PDMIn.h
@@ -33,6 +33,7 @@
 
 extern const mp_obj_type_t audiobusio_pdmin_type;
 
+#if CIRCUITPY_AUDIOBUSIO_PDMIN
 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);
@@ -43,5 +44,6 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
 uint8_t common_hal_audiobusio_pdmin_get_bit_depth(audiobusio_pdmin_obj_t* self);
 uint32_t common_hal_audiobusio_pdmin_get_sample_rate(audiobusio_pdmin_obj_t* self);
 // TODO(tannewt): Add record to file
+#endif
 
 #endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOBUSIO_AUDIOOUT_H
diff --git a/shared-module/audiocore/__init__.c b/shared-module/audiocore/__init__.c
index ac9d41b60..7bdfe460c 100644
--- a/shared-module/audiocore/__init__.c
+++ b/shared-module/audiocore/__init__.c
@@ -70,3 +70,63 @@ void audiosample_get_buffer_structure(mp_obj_t sample_obj, bool single_channel,
     proto->get_buffer_structure(MP_OBJ_TO_PTR(sample_obj), single_channel, single_buffer,
         samples_signed, max_buffer_length, spacing);
 }
+
+void audiosample_convert_u8m_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes) {
+    for(;nframes--;) {
+        int16_t sample = (*buffer_in++ - 0x80) << 8;
+        *buffer_out++ = sample;
+        *buffer_out++ = sample;
+    }
+}
+
+
+void audiosample_convert_u8s_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes) {
+    size_t nsamples = 2*nframes;
+    for(;nsamples--;) {
+        int16_t sample = (*buffer_in++ - 0x80) << 8;
+        *buffer_out++ = sample;
+    }
+}
+
+void audiosample_convert_s8m_s16s(int16_t *buffer_out, const int8_t *buffer_in, size_t nframes) {
+    for(;nframes--;) {
+        int16_t sample = (*buffer_in++) << 8;
+        *buffer_out++ = sample;
+        *buffer_out++ = sample;
+    }
+}
+
+
+void audiosample_convert_s8s_s16s(int16_t *buffer_out, const int8_t *buffer_in, size_t nframes) {
+    size_t nsamples = 2*nframes;
+    for(;nsamples--;) {
+        int16_t sample = (*buffer_in++) << 8;
+        *buffer_out++ = sample;
+    }
+}
+
+
+void audiosample_convert_u16m_s16s(int16_t *buffer_out, const uint16_t *buffer_in, size_t nframes) {
+    for(;nframes--;) {
+        int16_t sample = *buffer_in++ - 0x8000;
+        *buffer_out++ = sample;
+        *buffer_out++ = sample;
+    }
+}
+
+
+void audiosample_convert_u16s_s16s(int16_t *buffer_out, const uint16_t *buffer_in, size_t nframes) {
+    size_t nsamples = 2*nframes;
+    for(;nsamples--;) {
+        int16_t sample = *buffer_in++ - 0x8000;
+        *buffer_out++ = sample;
+    }
+}
+
+void audiosample_convert_s16m_s16s(int16_t *buffer_out, const int16_t *buffer_in, size_t nframes) {
+    for(;nframes--;) {
+        int16_t sample = *buffer_in++;
+        *buffer_out++ = sample;
+        *buffer_out++ = sample;
+    }
+}
diff --git a/shared-module/audiocore/__init__.h b/shared-module/audiocore/__init__.h
index 7a56454b8..ec2cf1cfa 100644
--- a/shared-module/audiocore/__init__.h
+++ b/shared-module/audiocore/__init__.h
@@ -74,4 +74,12 @@ void audiosample_get_buffer_structure(mp_obj_t sample_obj, bool single_channel,
                                       bool* single_buffer, bool* samples_signed,
                                       uint32_t* max_buffer_length, uint8_t* spacing);
 
+void audiosample_convert_u8m_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes);
+void audiosample_convert_u8s_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes);
+void audiosample_convert_s8m_s16s(int16_t *buffer_out, const int8_t *buffer_in, size_t nframes);
+void audiosample_convert_s8s_s16s(int16_t *buffer_out, const int8_t *buffer_in, size_t nframes);
+void audiosample_convert_u16m_s16s(int16_t *buffer_out, const uint16_t *buffer_in, size_t nframes);
+void audiosample_convert_u16s_s16s(int16_t *buffer_out, const uint16_t *buffer_in, size_t nframes);
+void audiosample_convert_s16m_s16s(int16_t *buffer_out, const int16_t *buffer_in, size_t nframes);
+
 #endif  // MICROPY_INCLUDED_SHARED_MODULE_AUDIOCORE__INIT__H
diff --git a/supervisor/port.h b/supervisor/port.h
index 862400986..812cf715b 100644
--- a/supervisor/port.h
+++ b/supervisor/port.h
@@ -99,4 +99,8 @@ void port_background_task(void);
 void port_start_background_task(void);
 void port_finish_background_task(void);
 
+// Some ports need special handling to wake the main task from an interrupt
+// context or other task.  The port must implement the necessary code in this
+// function.  A default weak implementation is provided that does nothing.
+void port_wake_main_task(void);
 #endif  // MICROPY_INCLUDED_SUPERVISOR_PORT_H
diff --git a/supervisor/shared/background_callback.c b/supervisor/shared/background_callback.c
index ef686cbab..288c9a4df 100644
--- a/supervisor/shared/background_callback.c
+++ b/supervisor/shared/background_callback.c
@@ -38,6 +38,8 @@ STATIC volatile background_callback_t *callback_head, *callback_tail;
 #define CALLBACK_CRITICAL_BEGIN (common_hal_mcu_disable_interrupts())
 #define CALLBACK_CRITICAL_END (common_hal_mcu_enable_interrupts())
 
+MP_WEAK void port_wake_main_task(void) {}
+
 void background_callback_add_core(background_callback_t *cb) {
     CALLBACK_CRITICAL_BEGIN;
     if (cb->prev || callback_head == cb) {
@@ -55,6 +57,8 @@ void background_callback_add_core(background_callback_t *cb) {
     }
     callback_tail = cb;
     CALLBACK_CRITICAL_END;
+
+    port_wake_main_task();
 }
 
 void background_callback_add(background_callback_t *cb, background_callback_fun fun, void *data) {
diff --git a/tools/analyze_mpy.py b/tools/analyze_mpy.py
index a2f541d0f..99c06f62a 100644..100755
--- a/tools/analyze_mpy.py
+++ b/tools/analyze_mpy.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
 #
 # SPDX-License-Identifier: MIT