DMA controller concept in Embedded C - Mini Project: Build & Apply

DMA Controller Concept Simulation in Embedded C

📖 Scenario: Imagine you are working with a microcontroller that needs to transfer data from one memory area to another without using the CPU all the time. This is done using a DMA (Direct Memory Access) controller. It helps the CPU by moving data automatically, so the CPU can do other tasks.

🎯 Goal: You will create a simple program in Embedded C that simulates a DMA controller transferring data from a source array to a destination array. You will set up the data, configure the transfer size, perform the transfer using a loop, and then print the result.

📋 What You'll Learn

Create a source array with exact values

Create a destination array with the same size initialized to zero

Create a variable for transfer size

Use a for loop to copy data from source to destination

Print the destination array values after transfer

💡 Why This Matters

🌍 Real World

DMA controllers are used in microcontrollers and processors to move data quickly without using the CPU, improving performance in devices like sensors, displays, and communication modules.

💼 Career

Understanding DMA helps embedded systems engineers optimize hardware usage and write efficient firmware for real-time applications.

1

DATA SETUP: Create source and destination arrays

Create an integer array called source with these exact values: 10, 20, 30, 40, 50. Also create an integer array called destination of size 5 initialized with zeros.

Embedded C

// Your code here

Need a hint?

Use curly braces to list the values inside the array. Initialize destination with zeros.

2

CONFIGURATION: Define transfer size

Create an integer variable called transfer_size and set it to 5 to represent the number of elements to transfer.

Embedded C

int source[5] = {10, 20, 30, 40, 50};
int destination[5] = {0, 0, 0, 0, 0};
// Your code here

Need a hint?

Just create a simple integer variable and assign 5 to it.

3

CORE LOGIC: Perform DMA transfer simulation

Use a for loop with variable i from 0 to less than transfer_size to copy each element from source[i] to destination[i].

Embedded C

int source[5] = {10, 20, 30, 40, 50};
int destination[5] = {0, 0, 0, 0, 0};
int transfer_size = 5;
// Your code here

Need a hint?

Use a for loop to copy each element one by one from source to destination.

4

OUTPUT: Print the destination array

Use a for loop with variable i from 0 to less than transfer_size to print each element of destination[i] followed by a space. Then print a newline.

Embedded C

int source[5] = {10, 20, 30, 40, 50};
int destination[5] = {0, 0, 0, 0, 0};
int transfer_size = 5;

for (int i = 0; i < transfer_size; i++) {
    destination[i] = source[i];
}
// Your code here

Need a hint?

Use printf inside a loop to print each number followed by a space, then print a newline.