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