Memory-to-peripheral transfer in Embedded C - Mini Project: Build & Apply

Memory-to-peripheral transfer

📖 Scenario: You are working on a simple embedded system that needs to send a fixed set of data bytes from memory to a peripheral device. This is a common task in embedded programming where data stored in memory must be transferred to hardware registers to control devices.

🎯 Goal: Build a small program that copies data from a memory array to a peripheral register using a loop. This will help you understand how to move data from memory to a peripheral in embedded C.

📋 What You'll Learn

Create a memory array with exact data bytes

Define a peripheral register as a variable

Use a loop to transfer each byte from memory to the peripheral register

Print the final value of the peripheral register after transfer

💡 Why This Matters

🌍 Real World

Embedded systems often need to send data from memory to hardware devices like sensors, displays, or communication modules. This project simulates that basic transfer.

💼 Career

Understanding memory-to-peripheral data transfer is essential for embedded software developers working on microcontrollers and hardware interfacing.

1

Create the memory data array

Create an unsigned char array called memory_data with these exact bytes: 0x12, 0x34, 0x56, 0x78.

Embedded C

// Create the memory_data array with the exact bytes
// Your code here

Need a hint?

Use curly braces to list the bytes inside the array.

2

Define the peripheral register variable

Define an unsigned char variable called PERIPHERAL_REG and initialize it to 0.

Embedded C

unsigned char memory_data[4] = {0x12, 0x34, 0x56, 0x78};
// Define the peripheral register variable
// Your code here

Need a hint?

Use unsigned char type and set initial value to zero.

3

Transfer data from memory to peripheral

Write a for loop using int i from 0 to 3 that assigns memory_data[i] to PERIPHERAL_REG inside the loop.

Embedded C

unsigned char memory_data[4] = {0x12, 0x34, 0x56, 0x78};
unsigned char PERIPHERAL_REG = 0;
// Transfer each byte from memory_data to PERIPHERAL_REG
// Your code here

Need a hint?

Use a for loop with i from 0 to 3 and assign inside the loop.

4

Print the final peripheral register value

Write a printf statement to print the final value of PERIPHERAL_REG in hexadecimal format with the text: "Final PERIPHERAL_REG value: 0x%02X\n".

Embedded C

unsigned char memory_data[4] = {0x12, 0x34, 0x56, 0x78};
unsigned char PERIPHERAL_REG = 0;
for (int i = 0; i < 4; i++) {
    PERIPHERAL_REG = memory_data[i];
}
// Print the final value of PERIPHERAL_REG
// Your code here

Need a hint?

Use printf with %02X to show two-digit hex value.