8000 Added basic Espressif PDM microphone support #7454 · JetForMe/circuitpython@70b310b · GitHub
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Added basic Espressif PDM microphone support adafruit#7454 
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5 files changed

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‎locale/circuitpython.pot

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2498,6 +2498,10 @@ msgstr ""
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msgid "binary op %q not implemented"
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msgstr ""
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#: ports/espressif/common-hal/audiobusio/PDMIn.c
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msgid "bit_depth must be 8, 16, 24, or 32."
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msgstr ""
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#: shared-module/bitmapfilter/__init__.c
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msgid "bitmap size and depth must match"
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msgstr ""
@@ -2592,7 +2596,7 @@ msgstr ""
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msgid "can't cancel self"
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msgstr ""
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2595-
#: shared-module/adafruit_pixelbuf/PixelBuf.c
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#: py/obj.c shared-module/adafruit_pixelbuf/PixelBuf.c
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msgid "can't convert %q to %q"
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msgstr ""
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‎ports/espressif/common-hal/audiobusio/PDMIn.c

Lines changed: 122 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3,3 +3,125 @@
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// SPDX-FileCopyrightText: Copyright (c) 2024 Adafruit Industries LLC
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//
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// SPDX-License-Identifier: MIT
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#include "bindings/espidf/__init__.h"
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#include "common-hal/audiobusio/PDMIn.h"
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#include "py/mpprint.h"
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#include "shared-bindings/audiobusio/PDMIn.h"
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#include "driver/i2s_pdm.h"
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/**
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Note: I think this function needs an additional parameter for the word select
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pin. It takes `mono`, a boolean indicating if it should be mono or
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stereo, but without a word select pin, I don't think one can get
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the other channel.
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*/
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void common_hal_audiobusio_pdmin_construct(audiobusio_pdmin_obj_t *self,
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const mcu_pin_obj_t *clock_pin,
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const mcu_pin_obj_t *data_pin,
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uint32_t sample_rate,
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uint8_t bit_depth,
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bool mono,
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uint8_t oversample) {
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if (bit_depth != I2S_DATA_BIT_WIDTH_8BIT
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&& bit_depth != I2S_DATA_BIT_WIDTH_16BIT
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&& bit_depth != I2S_DATA_BIT_WIDTH_24BIT
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&& bit_depth != I2S_DATA_BIT_WIDTH_32BIT) {
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mp_raise_ValueError(MP_ERROR_TEXT("bit_depth must be 8, 16, 24, or 32."));
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}
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i2s_chan_config_t chanConfig = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_0, I2S_ROLE_MASTER);
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esp_err_t err = i2s_new_channel(&chanConfig, NULL, &self->rx_chan);
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CHECK_ESP_RESULT(err);
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i2s_pdm_rx_config_t pdm_rx_cfg = {
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.clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(sample_rate),
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.slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(bit_depth, mono ? I2S_SLOT_MODE_MONO : I2S_SLOT_MODE_STEREO),
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.gpio_cfg =
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{
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.clk = clock_pin->number,
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.din = data_pin->number,
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.invert_flags =
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{
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.clk_inv = false,
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},
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},
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};
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err = i2s_channel_init_pdm_rx_mode(self->rx_chan, &pdm_rx_cfg);
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CHECK_ESP_RESULT(err);
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err = i2s_channel_enable(self->rx_chan);
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CHECK_ESP_RESULT(err);
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self->clock_pin = clock_pin;
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self->data_pin = data_pin;
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claim_pin(clock_pin);
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claim_pin(data_pin);
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self->sample_rate = sample_rate;
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self->bit_depth = bit_depth;
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}
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bool common_hal_audiobusio_pdmin_deinited(audiobusio_pdmin_obj_t *self) {
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return self->clock_pin == NULL;
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}
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void common_hal_audiobusio_pdmin_deinit(audiobusio_pdmin_obj_t *self) {
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mp_printf(MP_PYTHON_PRINTER, "Deinit\n");
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if (common_hal_audiobusio_pdmin_deinited(self)) {
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mp_printf(MP_PYTHON_PRINTER, "Already deinitted, bailing\n");
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return;
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}
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esp_err_t err = i2s_channel_disable(self->rx_chan);
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CHECK_ESP_RESULT(err);
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err = i2s_del_channel(self->rx_chan);
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CHECK_ESP_RESULT(err);
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// common_hal_audiobusio_i2sout_stop(self);
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if (self->clock_pin) {
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reset_pin_number(self->clock_pin->number);
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}
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self->clock_pin = NULL;
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if (self->data_pin) {
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reset_pin_number(self->data_pin->number);
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}
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self->data_pin = NULL;
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}
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/**
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`length` is the buffer element count, not the byte count.
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*/
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uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t *self,
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uint16_t *buffer,
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uint32_t length) {
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// mp_printf(MP_PYTHON_PRINTER, "Copying bytes to buffer\n");
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size_t result = 0;
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size_t elementSize = common_hal_audiobusio_pdmin_get_bit_depth(self) / 8;
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esp_err_t err = i2s_channel_read(self->rx_chan, buffer, length * elementSize, &result, 100);
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CHECK_ESP_RESULT(err);
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return result;
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}
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uint8_t common_hal_audiobusio_pdmin_get_bit_depth(audiobusio_pdmin_obj_t *self) {
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return self->bit_depth;
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}
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uint32_t common_hal_audiobusio_pdmin_get_sample_rate(audiobusio_pdmin_obj_t *self) {
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return self->sample_rate;
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}

‎ports/espressif/common-hal/audiobusio/PDMIn.h

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,3 +5,18 @@
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "py/obj.h"
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#include "common-hal/audiobusio/__init__.h"
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#include "common-hal/microcontroller/Pin.h"
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typedef struct {
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i2s_t i2s;
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i2s_chan_handle_t rx_chan;
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const mcu_pin_obj_t *clock_pin;
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const mcu_pin_obj_t *data_pin;
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uint32_t sample_rate;
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uint8_t bit_depth;
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} audiobusio_pdmin_obj_t;

‎ports/espressif/mpconfigport.mk

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -230,6 +230,7 @@ CIRCUITPY_ESP_USB_SERIAL_JTAG ?= 0
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else ifeq ($(IDF_TARGET),esp32s3)
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# Modules
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CIRCUITPY_ALARM_TOUCH = 1
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CIRCUITPY_AUDIOBUSIO_PDMIN = 1
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CIRCUITPY_ESP_USB_SERIAL_JTAG ?= 0
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235236
# No room for _bleio on boards with 4MB flash

‎shared-bindings/audiobusio/PDMIn.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -95,7 +95,7 @@ static mp_obj_t audiobusio_pdmin_make_new(const mp_obj_type_t *type, size_t n_ar
9595
const mcu_pin_obj_t *data_pin = validate_obj_is_free_pin(args[ARG_data_pin].u_obj, MP_QSTR_data_pin);
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// create PDMIn object from the given pin
98-
audiobusio_pdmin_obj_t *self = mp_obj_malloc(audiobusio_pdmin_obj_t, &audiobusio_pdmin_type);
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audiobusio_pdmin_obj_t *self = mp_obj_malloc_with_finaliser(audiobusio_pdmin_obj_t, &audiobusio_pdmin_type);
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uint32_t sample_rate = args[ARG_sample_rate].u_int;
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uint8_t bit_depth = args[ARG_bit_depth].u_int;
@@ -210,6 +210,7 @@ MP_PROPERTY_GETTER(audiobusio_pdmin_sample_rate_obj,
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static const mp_rom_map_elem_t audiobusio_pdmin_locals_dict_table[] = {
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// Methods
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&audiobusio_pdmin_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audiobusio_pdmin_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audiobusio_pdmin___exit___obj) },

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