sample rate

This commit is contained in:
andre.malo 2023-06-01 15:58:47 +02:00
parent ae47d2a53d
commit 37cf881bfa

View file

@ -1,16 +1,116 @@
/*
ESP32 I2S Microphone Sample
esp32-i2s-mic-sample.ino
Sample sound from I2S microphone, display on Serial Plotter
Requires INMP441 I2S microphone
DroneBot Workshop 2022
https://dronebotworkshop.com
*/
#include <Arduino.h>
const int potPin = 33;
//la valeur du potentiomètre
// Include I2S driver
#include <driver/i2s.h>
int potvalue=0;
// Connections to INMP441 I2S microphone
#define I2S_WS 25
#define I2S_SD 33
#define I2S_SCK 32
void setup() {
pinMode(potPin,INPUT);
Serial.begin(9600);
// Use I2S Processor 0
#define I2S_PORT I2S_NUM_0
// Define input buffer length
#define bufferLen 1024
int16_t sBuffer[bufferLen];
void i2s_install()
{
// Set up I2S Processor configuration
const i2s_config_t i2s_config = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = 44100,
.bits_per_sample = i2s_bits_per_sample_t(16),
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_STAND_I2S),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 4,
.dma_buf_len = bufferLen,
.use_apll = false,
.tx_desc_auto_clear = false,
.fixed_mclk = 0};
i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
}
void loop() {
//mesure la valeur du potentiomtre
potvalue=analogRead (potPin);
Serial.println (potvalue);}
void i2s_setpin()
{
// Set I2S pin configuration
const i2s_pin_config_t pin_config = {
.bck_io_num = I2S_SCK,
.ws_io_num = I2S_WS,
.data_out_num = -1,
.data_in_num = I2S_SD};
i2s_set_pin(I2S_PORT, &pin_config);
}
void setup()
{
// Set up Serial Monitor
Serial.begin(115200);
Serial.println(" ");
delay(1000);
// Set up I2S
i2s_install();
i2s_setpin();
i2s_start(I2S_PORT);
delay(500);
}
void loop()
{
// False print statements to "lock range" on serial plotter display
// Change rangelimit value to adjust "sensitivity"
int rangelimit = 3000;
Serial.print(rangelimit * -1);
Serial.print(" ");
Serial.print(rangelimit);
Serial.print(" ");
// Get I2S data and place in data buffer
size_t bytesIn = 0;
esp_err_t result = i2s_read(I2S_PORT, &sBuffer, bufferLen, &bytesIn, portMAX_DELAY);
if (result == ESP_OK)
{
// Read I2S data buffer
int16_t samples_read = bytesIn / 8;
if (samples_read > 0)
{
float mean = 0;
for (int16_t i = 0; i < samples_read; ++i)
{
mean += (sBuffer[i]);
}
// Average the data reading
mean /= samples_read;
// Print to serial plotter
Serial.println(mean);
int recu = bytesIn / sizeof(int32_t);
for (int i = 0; i < recu; i++)
{
Serial.printf("%ld\n", sBuffer[i]);
}
// Serial.print(" - ");
Serial.println(bytesIn);
}
}
}