次に、Wi-Fi ルーターとの接続、及びWebサーバー機能を試す。引き続き、以下ページのサンプルで検証を行なってみた。
「FPGAで遊んでみる」
手順としては、
- スケッチ例→WiFi→SimpleWiFiServer を選択
- ソースの ssid、password 部分を自ルーターに合わせる
- 確認用 LED出力ピンを前回使用の外部回路に合わせる
- 書き込みを行ない、シリアルモニタで IPアドレスを確認
- 任意のブラウザで URLにアクセスし動作確認
[ スケッチ：Esp32_SimpleWiFiServer ]
#include <WiFi.h>
const char *ssid = "********";
const char *password = "********";
int led_pin=33;
NetworkServer server(80);
void setup() {
Serial.begin(115200);
pinMode(led_pin, OUTPUT); // set the LED pin mode
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop() {
NetworkClient client = server.accept(); // listen for incoming clients
if (client) { // if you get a client,
Serial.println("New Client."); // print a message out the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
client.print("<html lang=\"ja\">");
client.print("<head>");
client.print("<meta charset=\"UTF-8\">");
client.print("</head><body>");
// the content of the HTTP response follows the header:
client.print("<h1>Wi-Fi経由のLED点灯</h1>");
client.print("Click <a href=\"/H\">here</a> to turn the LED on pin 33 on.<br>");
client.print("Click <a href=\"/L\">here</a> to turn the LED on pin 33 off.<br>");
client.print("</body>");
client.print("</html>");
// The HTTP response ends with another blank line:
client.println();
// break out of the while loop:
break;
} else { // if you got a newline, then clear currentLine:
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
// Check to see if the client request was "GET /H" or "GET /L":
if (currentLine.endsWith("GET /H")) {
digitalWrite(led_pin, HIGH); // GET /H turns the LED on
}
if (currentLine.endsWith("GET /L")) {
digitalWrite(led_pin, LOW); // GET /L turns the LED off
}
}
}
// close the connection:
client.stop();
Serial.println("Client Disconnected.");
}
}