From 4654bea268d5070d04363330f07c9b1f1b917a40 Mon Sep 17 00:00:00 2001 From: Jose Date: Fri, 25 Apr 2025 07:51:17 +0200 Subject: [PATCH] First try to output INMP441 to arduin serial plotter --- platformio.ini | 4 +- src/main.cpp | 138 ++++++++++++++++++++----------------------------- 2 files changed, 60 insertions(+), 82 deletions(-) diff --git a/platformio.ini b/platformio.ini index 938b322..3fc8b17 100644 --- a/platformio.ini +++ b/platformio.ini @@ -33,4 +33,6 @@ monitor_filters = esp32_exception_decoder lib_deps = https://github.com/pschatzmann/arduino-audio-tools.git https://github.com/pschatzmann/arduino-audio-driver.git - \ No newline at end of file + https://github.com/tzapu/WiFiManager.git + me-no-dev/AsyncTCP + https://github.com/me-no-dev/ESPAsyncWebServer.git diff --git a/src/main.cpp b/src/main.cpp index afd15cf..3df1c9c 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -1,88 +1,64 @@ -#include "AudioTools.h" -// #include "AudioTools/AudioLibs/AudioI2SStream.h" -#include "AudioTools/AudioLibs/AudioRealFFT.h" // or AudioKissFFT +#include +#include -I2SStream i2sStream; // I2S input stream for INMP441 -AudioRealFFT fft; // FFT analyzer -StreamCopy copier(fft, i2sStream); // copy I2S mic to FFT +// you shouldn't need to change these settings +#define SAMPLE_BUFFER_SIZE 512 +#define SAMPLE_RATE 8000 +// most microphones will probably default to left channel but you may need to tie the L/R pin low +#define I2S_MIC_CHANNEL I2S_CHANNEL_FMT_ONLY_LEFT +// either wire your microphone to the same pins or change these to match your wiring +#define I2S_MIC_SERIAL_CLOCK 8 +#define I2S_MIC_LEFT_RIGHT_CLOCK 9 +#define I2S_MIC_SERIAL_DATA 10 -int channels = 1; // INMP441 is mono -int samples_per_second = 11025; -int bits_per_sample = 32; // INMP441 sends 24-bit data in 32-bit words +// don't mess around with this +i2s_config_t i2s_config = { + .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX), + .sample_rate = SAMPLE_RATE, + .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, + .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, + .communication_format = I2S_COMM_FORMAT_I2S, + .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, + .dma_buf_count = 4, + .dma_buf_len = 1024, + .use_apll = false, + .tx_desc_auto_clear = false, + .fixed_mclk = 0}; -const char* solfegeName(uint8_t midiNote) { - static const char* solfegeNames[] = { - "Do", "Do#", "Re", "Re#", "Mi", "Fa", "Fa#", "Sol", "Sol#", "La", "La#", "Si" - }; - return solfegeNames[midiNote % 12]; -} +// and don't mess around with this +i2s_pin_config_t i2s_mic_pins = { + .bck_io_num = I2S_MIC_SERIAL_CLOCK, + .ws_io_num = I2S_MIC_LEFT_RIGHT_CLOCK, + .data_out_num = I2S_PIN_NO_CHANGE, + .data_in_num = I2S_MIC_SERIAL_DATA}; -void fftResult(AudioFFTBase &fft) { - float diff; - auto result = fft.result(); - - if (result.magnitude > 100) { // avoid noise floor - float magnitude_dB = 20.0 * log10(result.magnitude); - float freq = result.frequency; - - // MIDI note number - int midiNote = round(69 + 12.0 * log2(freq / 440.0)); - const char* solfege = solfegeName(midiNote); - int octave = (midiNote / 12) - 1; - - Serial.print(freq, 2); - Serial.print(" Hz | "); - - Serial.print("MIDI "); - Serial.print(midiNote); - Serial.print(" | "); - - Serial.print("Note: "); - Serial.print(result.frequencyAsNote(diff)); - Serial.print(" | "); - - Serial.print("Solfège: "); - Serial.print(solfege); - Serial.print(octave); - - Serial.print(" | dB: "); - Serial.print(magnitude_dB, 2); - - Serial.print(" | Diff: "); - Serial.println(diff, 2); - } -} - - -void setup() { +void setup() +{ + // we need serial output for the plotter Serial.begin(115200); - AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning); - - // Configure I2SStream for INMP441 - auto cfg = i2sStream.defaultConfig(RX_MODE); - cfg.i2s_format = I2S_STD_FORMAT; - cfg.bits_per_sample = bits_per_sample; - cfg.channels = channels; - cfg.sample_rate = samples_per_second; - cfg.is_master = true; - cfg.pin_bck = 8; // SCK - cfg.pin_ws = 9; // WS - cfg.pin_data = 10; // SD - i2sStream.begin(cfg); - - // Configure FFT - auto tcfg = fft.defaultConfig(); - tcfg.length = 8192; // 186ms @ 11kHz minimun C2 theoretical - tcfg.channels = channels; - tcfg.sample_rate = samples_per_second; - tcfg.bits_per_sample = bits_per_sample; - tcfg.callback = &fftResult; - fft.begin(tcfg); - - Serial.println("Setup complete. Listening..."); - + // start up the I2S peripheral + i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL); + i2s_set_pin(I2S_NUM_0, &i2s_mic_pins); } -void loop() { - copier.copy(); // Stream mic data into FFT processor -} +int32_t raw_samples[SAMPLE_BUFFER_SIZE]; +void loop() +{ + // read from the I2S device + size_t bytes_read = 0; + i2s_read(I2S_NUM_0, raw_samples, sizeof(int32_t) * SAMPLE_BUFFER_SIZE, &bytes_read, portMAX_DELAY); + int samples_read = bytes_read / sizeof(int32_t); + // dump the samples out to the serial channel. + for (int i = 0; i < samples_read; i++) + { + // False print statements to "lock range" on serial plotter display + // Change rangelimit value to adjust "sensitivity" + int rangelimit = 2000000; + Serial.print(rangelimit * -1); + Serial.print(" "); + Serial.print(rangelimit); + Serial.print(" "); + + Serial.printf("%ld\n", raw_samples[i]); + } +} \ No newline at end of file