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feat: Add examples to demonstrate how to use FreeRTOS with Ethernet
Both WebClientFreeRTOS and WebServerFreeRTOS are available. Warning: FreeRTOS may disable interrupts between xTaskCreate() and vTaskStartScheduler(). Thus Ethernet, which is using Interrupts, should be initialized after scheduling start. thus it is done within a task. Fixes #36 Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>
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‎examples/WebClientFreeRTOS/WebClientFreeRTOS.ino

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/*
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Port of WebClient on FreeRTOS
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This sketch connects to a website (http://www.google.com)
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Circuit:
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* STM32 board with Ethernet support
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created 18 Dec 2009
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by David A. Mellis
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modified 9 Apr 2012
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by Tom Igoe, based on work by Adrian McEwen
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modified 23 Jun 2017
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by Wi6Labs
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modified 1 Jun 2018
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by sstaub
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*/
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#include <LwIP.h>
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#include <STM32Ethernet.h>
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#include <STM32FreeRTOS.h>
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// if you don't want to use DNS (and reduce your sketch size)
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// use the numeric IP instead of the name for the server:
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//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
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char server[] = "www.google.com"; // name address for Google (using DNS)
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// Set the static IP address to use if the DHCP fails to assign
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IPAddress ip(192, 168, 0, 177);
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// Initialize the Ethernet client library
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// with the IP address and port of the server
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// that you want to connect to (port 80 is default for HTTP):
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EthernetClient client;
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// task code
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void taskETH(void* arg) {
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UNUSED(arg);
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// start the Ethernet connection:
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if (Ethernet.begin() == 0) {
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Serial.println("Failed to configure Ethernet using DHCP");
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// try to configure using IP address instead of DHCP:
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Ethernet.begin(ip);
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}
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// give the Ethernet shield a second to initialize:
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delay(1000);
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Serial.println("connecting...");
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// if you get a connection, report back via serial:
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if (client.connect(server, 80)) {
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Serial.println("connected");
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// Make a HTTP request:
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client.println("GET /search?q=arduino HTTP/1.1");
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client.println("Host: www.google.com");
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client.println("Connection: close");
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client.println();
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} else {
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// if you didn't get a connection to the server:
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Serial.println("connection failed");
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}
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while(1){
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// if there are incoming bytes available
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// from the server, read them and print them:
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if (client.available()) {
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char c = client.read();
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Serial.print(c);
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}
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// if the server's disconnected, stop the client:
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if (!client.connected()) {
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Serial.println();
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Serial.println("disconnecting.");
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client.stop();
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// do nothing forevermore:
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while (true);
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}
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}
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}
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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portBASE_TYPE s = xTaskCreate(taskETH, NULL, 200, NULL, 1, NULL);
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if (s != pdPASS) {
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printf("Ethernet task creation failed\n");
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while (1);
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}
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vTaskStartScheduler();
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Serial.println("Scheduler failed");
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while (1);
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}
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void loop() {
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// Not used.
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}

‎examples/WebServerFreeRTOS/WebServerFreeRTOS.ino

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/*
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Port of WebServer on FreeRTOS
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A simple web server that shows the value of the analog input pins.
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2 task are created:
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Ethernet: to manage the server
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Analog to read input values
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Circuit:
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STM32 board with Ethernet support
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Analog inputs attached to pins A0 through A5 (optional)
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created 18 Dec 2009
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by David A. Mellis
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modified 9 Apr 2012
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by Tom Igoe
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modified 02 Sept 2015
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by Arturo Guadalupi
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modified 23 Jun 2017
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by Wi6Labs
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modified 1 Jun 2018
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by sstaub
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*/
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#include <LwIP.h>
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#include <STM32Ethernet.h>
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#include <STM32FreeRTOS.h>
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// Enter an IP address for your controller below.
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// The IP address will be dependent on your local network:
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IPAddress ip(192, 168, 0, 177);
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// Initialize the Ethernet server library
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// with the IP address and port you want to use
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// (port 80 is default for HTTP):
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EthernetServer server(80);
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#define ANALOG_CHANEL_NUMBER 6
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int sensorReading[ANALOG_CHANEL_NUMBER];
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void taskAnalog(void* arg) {
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UNUSED(arg);
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while (1) {
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for (int analogChannel = 0; analogChannel < ANALOG_CHANEL_NUMBER; analogChannel++) {
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sensorReading[analogChannel] = analogRead(analogChannel);
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}
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vTaskDelay(1000); // read Analog every seconds
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}
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}
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// task code
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void taskETH(void* arg) {
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UNUSED(arg);
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// start the Ethernet connection and the server:
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Ethernet.begin(ip);
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server.begin();
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Serial.print("server is at ");
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Serial.println(Ethernet.localIP());
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while (1) {
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// listen for incoming clients
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EthernetClient client = server.available();
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if (client) {
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Serial.println("new client");
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// an http request ends with a blank line
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bool currentLineIsBlank = true;
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while (client.connected()) {
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if (client.available()) {
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char c = client.read();
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Serial.write(c);
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// if you've gotten to the end of the line (received a newline
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// character) and the line is blank, the http request has ended,
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// so you can send a reply
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if (c == '\n' && currentLineIsBlank) {
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// send a standard http response header
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client.println("HTTP/1.1 200 OK");
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client.println("Content-Type: text/html");
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client.println("Connection: close"); // the connection will be closed after completion of the response
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client.println("Refresh: 5"); // refresh the page automatically every 5 sec
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client.println();
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client.println("<!DOCTYPE HTML>");
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client.println("<html>");
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// output the value of each analog input pin
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for (int analogChannel = 0; analogChannel < ANALOG_CHANEL_NUMBER; analogChannel++) {
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client.print("analog input ");
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client.print(analogChannel);
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client.print(" is ");
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client.print(sensorReading[analogChannel]);
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client.println("<br />");
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}
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client.println("</html>");
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break;
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}
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if (c == '\n') {
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// you're starting a new line
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currentLineIsBlank = true;
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} else if (c != '\r') {
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// you've gotten a character on the current line
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currentLineIsBlank = false;
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}
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}
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}
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// give the web browser time to receive the data
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delay(1);
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// close the connection:
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client.stop();
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Serial.println("client disconnected");
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}
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}
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}
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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portBASE_TYPE s = xTaskCreate(taskETH, NULL, 200, NULL, 1, NULL);
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if (s != pdPASS) {
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printf("Ethernet task creation failed\n");
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while (1);
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}
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s = xTaskCreate(taskAnalog, NULL, 200, NULL, 2, NULL);
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if (s != pdPASS) {
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printf("Analog task creation failed\n");
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while (1);
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}
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vTaskStartScheduler();
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Serial.println("Scheduler failed");
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while (1);
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}
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void loop() {
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// Not used.
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}

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