Program_Flows

Embedded Systems Design

Program Flows

Program Flows

```
Pooling
```

```
Interrupt Driven
```

Combination

Handling Concurrency

```
RTOS
```

Pooling

Basic Structure

void Setup()
{
  // Initialization code goes here
}

void Loop()
{
  // Your code goes here
}

Pooling

void Setup()
{
  // Initialization code goes here
  Initialization();
}

void Loop()
{
  // Your code goes here
  if(Peripheral_A)
  {
    ProcessA();
  }

  if(Peripheral_B)
  {
    ProcessB();
  }
  
  if(Peripheral_C)
  {
    ProcessC();
  }
}

Interrupt Driven

Basic Structure

void Setup()
{
  // Initialization code goes here
}

void Loop()
{
  // Your code goes here
}

Interrupt Driven

void Setup()
{
  // Initialization code goes here
  Initialization();
}

void Loop()
{
  // Empty. Things are done in Interrupts
}

void ISR(Routine_A)
{
  ProcessA();
}

void ISR(Routine_B)
{
  ProcessB();
}

void ISR(Routine_C)
{
  ProcessC();
}

Combination

Basic Structure

void Setup()
{
  // Initialization code goes here
}

void Loop()
{
  // Your code goes here
}

Combination

volatile char isr_flag_a = 0;

void Setup()
{
  // Initialization code goes here
  Initialization();
}

void Loop()
{
  // Your code goes here
  if(isr_flag_a == 1)
  {
    isr_flag_a = 0;  // Clear Flag
    Process_A();
  }
}

void ISR(Routine_A)
{
  isr_flag_a = 1;
}

RTOS

Basic Structure

void Setup()
{
  // Initialization code goes here
}

void Loop()
{
  // Your code goes here
}

RTOS

#include <Arduino_FreeRTOS.h>

/* Additional Variables will be declared here... */

void Setup()
{
  // Initialization code goes here
  
  xTaskCreate(Task_A);  // Note: abstract representation
}

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

void Task_A()
{
  // your code goes here...
}