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...
}

Program_Flows

By Goncalo Martins

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Program_Flows

Embedded Systems Class (Software) - Program Flows

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