3.3.7

2026-05-22 21:52:50 +03:00
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+/* Basic Multi Threading Arduino Example
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+// Please read file README.md in the folder containing this example.
+
+#if CONFIG_FREERTOS_UNICORE
+#define TASK_RUNNING_CORE 0
+#else
+#define TASK_RUNNING_CORE 1
+#endif
+
+#define ANALOG_INPUT_PIN A0
+
+#ifndef LED_BUILTIN
+#define LED_BUILTIN 13  // Specify the on which is your LED
+#endif
+
+// Define two tasks for Blink & AnalogRead.
+void TaskBlink(void *pvParameters);
+void TaskAnalogRead(void *pvParameters);
+TaskHandle_t analog_read_task_handle;  // You can (don't have to) use this to be able to manipulate a task from somewhere else.
+
+// The setup function runs once when you press reset or power on the board.
+void setup() {
+  // Initialize serial communication at 115200 bits per second:
+  Serial.begin(115200);
+  // Set up two tasks to run independently.
+  uint32_t blink_delay = 1000;  // Delay between changing state on LED pin
+  xTaskCreate(
+    TaskBlink, "Task Blink"  // A name just for humans
+    ,
+    2048  // The stack size can be checked by calling `uxHighWaterMark = uxTaskGetStackHighWaterMark(NULL);`
+    ,
+    (void *)&blink_delay  // Task parameter which can modify the task behavior. This must be passed as pointer to void.
+    ,
+    2  // Priority
+    ,
+    NULL  // Task handle is not used here - simply pass NULL
+  );
+
+  // This variant of task creation can also specify on which core it will be run (only relevant for multi-core ESPs)
+  xTaskCreatePinnedToCore(
+    TaskAnalogRead, "Analog Read", 2048  // Stack size
+    ,
+    NULL  // When no parameter is used, simply pass NULL
+    ,
+    1  // Priority
+    ,
+    &analog_read_task_handle  // With task handle we will be able to manipulate with this task.
+    ,
+    TASK_RUNNING_CORE  // Core on which the task will run
+  );
+
+  Serial.printf("Basic Multi Threading Arduino Example\n");
+  // Now the task scheduler, which takes over control of scheduling individual tasks, is automatically started.
+}
+
+void loop() {
+  if (analog_read_task_handle != NULL) {  // Make sure that the task actually exists
+    delay(10000);
+    vTaskDelete(analog_read_task_handle);  // Delete task
+    analog_read_task_handle = NULL;        // prevent calling vTaskDelete on non-existing task
+  }
+}
+
+/*--------------------------------------------------*/
+/*---------------------- Tasks ---------------------*/
+/*--------------------------------------------------*/
+
+void TaskBlink(void *pvParameters) {  // This is a task.
+  uint32_t blink_delay = *((uint32_t *)pvParameters);
+
+  /*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+
+  If you want to know what pin the on-board LED is connected to on your ESP32 model, check
+  the Technical Specs of your board.
+*/
+
+  // initialize digital LED_BUILTIN on pin 13 as an output.
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  for (;;) {                          // A Task shall never return or exit.
+    digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
+    // arduino-esp32 has FreeRTOS configured to have a tick-rate of 1000Hz and portTICK_PERIOD_MS
+    // refers to how many milliseconds the period between each ticks is, ie. 1ms.
+    delay(blink_delay);
+    digitalWrite(LED_BUILTIN, LOW);  // turn the LED off by making the voltage LOW
+    delay(blink_delay);
+  }
+}
+
+void TaskAnalogRead(void *pvParameters) {  // This is a task.
+  (void)pvParameters;
+  // Check if the given analog pin is usable - if not - delete this task
+  if (digitalPinToAnalogChannel(ANALOG_INPUT_PIN) == -1) {
+    Serial.printf("TaskAnalogRead cannot work because the given pin %d cannot be used for ADC - the task will delete itself.\n", ANALOG_INPUT_PIN);
+    analog_read_task_handle = NULL;  // Prevent calling vTaskDelete on non-existing task
+    vTaskDelete(NULL);               // Delete this task
+  }
+
+  /*
+  AnalogReadSerial
+  Reads an analog input on pin A3, prints the result to the serial monitor.
+  Graphical representation is available using serial plotter (Tools > Serial Plotter menu)
+  Attach the center pin of a potentiometer to pin A3, and the outside pins to +5V and ground.
+
+  This example code is in the public domain.
+*/
+
+  for (;;) {
+    // read the input on analog pin:
+    int sensorValue = analogRead(ANALOG_INPUT_PIN);
+    // print out the value you read:
+    Serial.println(sensorValue);
+    delay(100);  // 100ms delay
+  }
+}