Fixing mic

CMakeLists.txt

@@ -5,18 +5,16 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 list(APPEND ZEPHYR_EXTRA_MODULES ${CMAKE_CURRENT_SOURCE_DIR}/model)
 
-# This firmware uses X-Nucleo IKS02A1 shield
-set(SHIELD x_nucleo_iks02a1)
-
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
-project(ei-zephyr-imu-inference)
-
-include(utils/cmake/utils.cmake)
+project(ei-zephyr-mic-kws-inference)
 
 # Needed for colorful output
 zephyr_compile_options(-fdiagnostics-color=always)
 
+# Disable warnings as errors for Edge Impulse SDK
+zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:-Wno-error=maybe-uninitialized>)
+
 # Project include directories
 set(INCLUDES
     .
@@ -26,6 +24,5 @@ include_directories(${INCLUDES})
 
 # add all sources to the project
 target_sources(app PRIVATE src/main.cpp)
-target_sources(app PRIVATE src/sensors/ei_accelerometer.cpp)
-target_sources(app PRIVATE src/sensors/ei_inertial.cpp)
+target_sources(app PRIVATE src/sensors/ei_microphone.cpp)
 target_sources(app PRIVATE src/inference/inferencing.cpp)

README.md

@@ -1,13 +1,13 @@
-# Edge Impulse IMU Inference on Zephyr
+# Edge Impulse Microphone Inference on Zephyr
 
-This repository demonstrates how to run IMU-based Edge Impulse models on Zephyr using the **Edge Impulse Zephyr Module**.  
-Drop in your model > build > flash > get real-time motion inference.
+This repository demonstrates how to run microphone-based Edge Impulse models on Zephyr using the **Edge Impulse Zephyr Module**.  
+Drop in your model > build > flash > get real-time audio inference.
 
 ## Initialize This Repo
 
 ```bash
- west init https://github.com/edgeimpulse/ei-zephyr-imu-inference.git
-cd ei-zephyr-imu-inference
+ west init https://github.com/edgeimpulse/ei-zephyr-mic-kws-inference.git
+cd ei-zephyr-mic-kws-inference
 west update
 ```
 
@@ -37,10 +37,10 @@ Your `model/` directory should contain:
 
 ## Build
 
-Choose your board (Example: Nucleo U585ZI):
+Choose your board (Example: Nordic thingy53):
 
 ```bash
-west build --pristine -b nucleo_u585zi_q
+west build --pristine -b thingy53/nrf5340/cpuapp
 ```
 
 ## Flash
@@ -57,9 +57,9 @@ west flash --runner nrfjprog
 west flash --runner openocd
 ```
 
-## Sensors Supported
+## Microphones Supported
 
-All sensors accessible through I²C/SPI + Zephyr sensor drivers are compatible.
+PDM microphones accessible through Zephyr's DMIC driver are compatible.
 
 ## Project Structure
 
@@ -71,14 +71,14 @@ All sensors accessible through I²C/SPI + Zephyr sensor drivers are compatible.
 └── src/
     ├── main.cpp
     ├── inference/          # Inference state machine
-    └── sensors/            # IMU interface
+    └── microphone/         # Microphone interface
 ```
 
 ## How It Works
 
-1. **Initialize** - Sensor setup via Zephyr sensor API
-2. **Sample** - Continuous data collection at model frequency
-3. **Buffer** - Circular buffer stores samples
+1. **Initialize** - Microphone setup via Zephyr DMIC API
+2. **Sample** - Continuous audio data collection at model frequency
+3. **Buffer** - Circular buffer stores audio samples
 4. **Infer** - Run classifier when buffer full
 5. **Output** - Print classification results
 6. **Loop** - Repeat
@@ -88,10 +88,9 @@ All sensors accessible through I²C/SPI + Zephyr sensor drivers are compatible.
 Key settings in `prj.conf`:
 
 ```properties
-CONFIG_EDGE_IMPULSE_SDK=y        # Enable Edge Impulse SDK
 CONFIG_MAIN_STACK_SIZE=8192      # Adjust for your model size
-CONFIG_SENSOR=y                  # Enable sensor subsystem
-CONFIG_I2C=y                     # Enable I2C for sensors
+CONFIG_AUDIO=y                   # Enable audio subsystem
+CONFIG_AUDIO_DMIC=y              # Enable DMIC for PDM microphones
 ```
 
 For larger models, increase stack size:

boards/thingy53_nrf5340_cpuapp.overlay

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 EdgeImpulse Inc.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+&pinctrl {
+    pdm0_default: pdm0_default {
+        group1 {
+            psels = <NRF_PSEL(PDM_CLK, 0, 25)>,
+                    <NRF_PSEL(PDM_DIN, 0, 26)>;
+        };
+    };
+};
+
+&pdm0 {
+    status = "okay";
+    pinctrl-0 = <&pdm0_default>;
+    pinctrl-names = "default";
+    clock-source = "PCLK32M_HFXO";
+};

prj.conf

@@ -29,9 +29,9 @@ CONFIG_EDGE_IMPULSE_SDK=y
 
 # Audio/PDM support
 #CONFIG_I2S=y
-#CONFIG_AUDIO=y
-#CONFIG_AUDIO_DMIC=y
+CONFIG_AUDIO=y
+CONFIG_AUDIO_DMIC=y
 
 # Sensors on X-Nucleo IKS02A1
-CONFIG_I2C=y
-CONFIG_SENSOR=y
+#CONFIG_I2C=y
+#CONFIG_SENSOR=y

src/inference/inferencing.cpp

@@ -35,8 +35,7 @@
 #include "inference/inferencing.h"
 #include "edge-impulse-sdk/classifier/ei_run_classifier.h"
 #include "edge-impulse-sdk/dsp/numpy.hpp"
-#include "sensors/ei_accelerometer.h"
-#include "sensors/ei_inertial.h"
+#include "sensors/ei_microphone.h"
 
 static bool ei_run_inference(void);
 static bool ei_start_impulse(void);
@@ -91,7 +90,7 @@ bool ei_inference_sm(void)
     while(INFERENCE_STATE_STOP != state) {
         switch(state){
             case INFERENCE_STATE_SAMPLING:
-                ei_fusion_accelerometer_read_data(3);
+                ei_microphone_sample();
                 ei_sleep(EI_CLASSIFIER_INTERVAL_MS);
                 // wait for data
                 break;

src/main.cpp

@@ -34,8 +34,7 @@
  */
 
 #include <zephyr/kernel.h>
-#include "sensors/ei_accelerometer.h"
-#include "sensors/ei_inertial.h"
+#include "sensors/ei_microphone.h"
 #include "inference/inferencing.h"
 #include <stdio.h>
 
@@ -45,8 +44,7 @@ int main(void)
     // This is needed so that output of printf is output immediately without buffering
     setvbuf(stdout, NULL, _IONBF, 0);
 
-    ei_inertial_init();
-    ei_accelerometer_init();
+    ei_microphone_init();
 
     ei_inference_sm(); // run state machine