76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
/*
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* Example of a Arduino interruption and RTOS Binary Semaphore
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* https://www.freertos.org/Embedded-RTOS-Binary-Semaphores.html
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*/
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// Include Arduino FreeRTOS library
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#include <Arduino_FreeRTOS.h>
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// Include semaphore supoport
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#include <semphr.h>
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/*
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* Declaring a global variable of type SemaphoreHandle_t
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*
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*/
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SemaphoreHandle_t interruptSemaphore;
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void setup() {
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// Create task for Arduino led
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xTaskCreate(TaskLed, // Task function
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"Led", // Task name
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128, // Stack size
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NULL,
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0, // Priority
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NULL );
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/**
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* Create a binary semaphore.
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* https://www.freertos.org/xSemaphoreCreateBinary.html
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*/
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interruptSemaphore = xSemaphoreCreateBinary();
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if (interruptSemaphore != NULL) {
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// Attach interrupt for Arduino digital pin
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attachInterrupt(digitalPinToInterrupt(BTN_BUILTIN), interruptHandler, RISING);
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}
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}
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void loop() {}
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void interruptHandler() {
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/**
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* Give semaphore in the interrupt handler
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* https://www.freertos.org/a00124.html
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*/
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xSemaphoreGiveFromISR(interruptSemaphore, NULL);
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}
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/*
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* Led task.
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*/
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void TaskLed(void *pvParameters)
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{
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(void) pvParameters;
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pinMode(LED_BUILTIN, OUTPUT);
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for (;;) {
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/**
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* Take the semaphore.
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* https://www.freertos.org/a00122.html
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*/
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if (xSemaphoreTake(interruptSemaphore, portMAX_DELAY) == pdPASS) {
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digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
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}
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vTaskDelay(10);
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}
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}
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