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/*
I2S stereo microphone (input) UDP transmitter
Needs a UDP listener (netcat/etc.) on port 8266 on the PC
Under Linux:
nc -u -p 8266 -l | play -t raw -r 11025 -b 16 -c 2 -e signed-integer -
Released to the Public Domain by Earle F. Philhower, III
*/
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <i2s.h>
#ifndef STASSID
#define STASSID "your-ssid"
#define STAPSK "your-password"
#endif
// Set your network here
const char *SSID = STASSID;
const char *PASS = STAPSK;
WiFiUDP udp;
// Set your listener PC's IP here:
const IPAddress listener = { 192, 168, 1, 2 };
const int port = 8266;
int16_t buffer[100][2]; // Temp staging for samples
void setup() {
Serial.begin(115200);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(SSID);
WiFi.begin(SSID, PASS);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("My IP: ");
Serial.println(WiFi.localIP());
i2s_rxtx_begin(true, false); // Enable I2S RX
i2s_set_rate(11025);
Serial.print("\nStart the listener on ");
Serial.print(listener);
Serial.print(":");
Serial.println(port);
Serial.println("ex: nc -u -p 8266 -l | play -t raw -r 11025 -b 16 -c 2 -e signed-integer -");
udp.beginPacket(listener, port);
udp.write("I2S Receiver\r\n");
udp.endPacket();
}
void loop() {
static int cnt = 0;
// Each loop will send 100 raw samples (400 bytes)
// UDP needs to be < TCP_MSS which can be 500 bytes in LWIP2
for (int i = 0; i < 100; i++) {
i2s_read_sample(&buffer[i][0], &buffer[i][1], true);
}
udp.beginPacket(listener, port);
udp.write((uint8_t*)buffer, sizeof(buffer));
udp.endPacket();
cnt++;
if ((cnt % 100) == 0) {
Serial.printf("%d\n", cnt);
}
}