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Add FreeRTOS multi-thread example (#2067)
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* Add FreeRTOS exsample

* Update Code

* Change stack size

* Fix LED_BUILTIN not defined

Fix LED_BUILTIN not defined
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lutfisan authored and me-no-dev committed Dec 16, 2018
1 parent 4d3f6ca commit be081ac
Showing 1 changed file with 97 additions and 0 deletions.
97 changes: 97 additions & 0 deletions libraries/FreeRTOS/FreeRTOS.ino
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#if CONFIG_FREERTOS_UNICORE
#define ARDUINO_RUNNING_CORE 0
#else
#define ARDUINO_RUNNING_CORE 1
#endif

#ifndef LED_BUILTIN
#define LED_BUILTIN 13
#endif

// define two tasks for Blink & AnalogRead
void TaskBlink( void *pvParameters );
void TaskAnalogReadA3( void *pvParameters );

// the setup function runs once when you press reset or power the board
void setup() {

// initialize serial communication at 115200 bits per second:
Serial.begin(115200);

// Now set up two tasks to run independently.
xTaskCreatePinnedToCore(
TaskBlink
, "TaskBlink" // A name just for humans
, 1024 // This stack size can be checked & adjusted by reading the Stack Highwater
, NULL
, 2 // Priority, with 3 (configMAX_PRIORITIES - 1) being the highest, and 0 being the lowest.
, NULL
, ARDUINO_RUNNING_CORE);

xTaskCreatePinnedToCore(
TaskAnalogReadA3
, "AnalogReadA3"
, 1024 // Stack size
, NULL
, 1 // Priority
, NULL
, ARDUINO_RUNNING_CORE);

// Now the task scheduler, which takes over control of scheduling individual tasks, is automatically started.
}

void loop()
{
// Empty. Things are done in Tasks.
}

/*--------------------------------------------------*/
/*---------------------- Tasks ---------------------*/
/*--------------------------------------------------*/

void TaskBlink(void *pvParameters) // This is a task.
{
(void) 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)
vTaskDelay(100); // one tick delay (15ms) in between reads for stability
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
vTaskDelay(100); // one tick delay (15ms) in between reads for stability
}
}

void TaskAnalogReadA3(void *pvParameters) // This is a task.
{
(void) pvParameters;

/*
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 A3:
int sensorValueA3 = analogRead(A3);
// print out the value you read:
Serial.println(sensorValueA3);
vTaskDelay(10); // one tick delay (15ms) in between reads for stability
}
}

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