Thursday, August 18, 2016

Independent LEDs Blinking



 using Arduino FreeRTOS, realtime multi tasking, :)

 I programmed LED on pin 2, 3, 4 and 13 to blink at its own time. The advantage of this Arduino FreeRTOS is we don't have to calculate the timing of each pin in respect of sequential execution. It's has its own task and schedule, independent of each other.



http://ift.tt/2b4jwFJ.


#include <Arduino_FreeRTOS.h>
int n = 0;

// define two tasks for Blink & AnalogRead
void TaskBlink( void *pvParameters );
void TaskBlink2( void *pvParameters );
void TaskBlink3( void *pvParameters );
void TaskBlink4( void *pvParameters );
void TaskTadaa( void *pvParameters );

// the setup function runs once when you press reset or power the board
void setup() {
   // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);  

  // Now set up two tasks to run independently.
  xTaskCreate(
    TaskBlink
    ,  (const portCHAR *)"Blink"   // A name just for humans
    ,  128  // Stack size
    ,  NULL
    ,  2  // priority
    ,  NULL );
  xTaskCreate(TaskBlink2,(const portCHAR *)"Blink2",128, NULL,2,NULL );
  xTaskCreate(TaskBlink3,(const portCHAR *)"Blink3",128, NULL,2,NULL );
  xTaskCreate(TaskBlink4,(const portCHAR *)"Blink4",128, NULL,2,NULL );

  xTaskCreate(
    TaskTadaa
    ,  (const portCHAR *) "Tadaa"
    ,  128 // This stack size can be checked & adjusted by reading Highwater
    ,  NULL
    ,  1  // priority
    ,  NULL );

  // 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;

  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);

  for (;;) // A Task shall never return or exit.
  {
    digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
    Serial.println("LED 13 Nyala");
    vTaskDelay( 1000 / portTICK_PERIOD_MS ); // wait for one second
    digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
    Serial.println("LED 13 Padam");
    vTaskDelay( 1000 / portTICK_PERIOD_MS ); // wait for one second
  }
}
void TaskBlink2(void *pvParameters){
  (void) pvParameters;
  pinMode(2, OUTPUT);
  for (;;) {
    digitalWrite(2, HIGH); vTaskDelay( 2000 / portTICK_PERIOD_MS );Serial.println("LED 2 Nyala");
    digitalWrite(2, LOW);  vTaskDelay( 2000 / portTICK_PERIOD_MS );Serial.println("LED 2 Padam"); 
  }
}

void TaskBlink3(void *pvParameters){
  (void) pvParameters;
  pinMode(3, OUTPUT);
  for (;;) {
    digitalWrite(3, HIGH); vTaskDelay( 500 / portTICK_PERIOD_MS );Serial.println("LED 3 Nyala");
    digitalWrite(3, LOW);  vTaskDelay( 1500 / portTICK_PERIOD_MS );Serial.println("LED 3 Padam"); 
  }
}

void TaskBlink4(void *pvParameters){
  (void) pvParameters;
  pinMode(4, OUTPUT);
  for (;;) {
    digitalWrite(4, HIGH); vTaskDelay( 500 / portTICK_PERIOD_MS );Serial.println("LED 4 Nyala");
    digitalWrite(4, LOW);  vTaskDelay( 250 / portTICK_PERIOD_MS );Serial.println("LED 4 Padam"); 
  }
}

void TaskTadaa(void *pvParameters)  // This is a task.
{
  (void) pvParameters;
  for (;;)
  {
    // read the input on analog pin 0:
    n++;
    if (n>100){n = 0;}
    // print out the value you read:
    Serial.print("Tadaa...");
    Serial.println(n);
    vTaskDelay(2000/portTICK_PERIOD_MS);// 2 second delay
    // one tick delay (15ms) in between reads for stability
  }
}