Baud rate configuration in Embedded C - Mini Project: Build & Apply

Baud rate configuration

📖 Scenario: You are working on a microcontroller project that communicates with other devices using UART. To ensure proper communication, you need to set the correct baud rate for the UART module.

🎯 Goal: Configure the UART baud rate register to set the baud rate to 9600 bps using a given clock frequency.

📋 What You'll Learn

Create a variable for the clock frequency

Create a variable for the desired baud rate

Calculate the baud rate register value using the formula

Assign the calculated value to the baud rate register variable

Print the baud rate register value

💡 Why This Matters

🌍 Real World

Setting the correct baud rate is essential for reliable serial communication between microcontrollers and other devices like sensors, computers, or modems.

💼 Career

Embedded systems engineers and firmware developers often configure UART settings to ensure devices communicate correctly and efficiently.

1

Set clock frequency

Create an unsigned long variable called clock_freq and set it to 16000000 (16 MHz).

Embedded C

// Create an unsigned long variable called clock_freq and set it to 16000000
// Your code here

Need a hint?

The clock frequency is usually the system clock speed in Hertz.

2

Set desired baud rate

Create an unsigned int variable called baud_rate and set it to 9600.

Embedded C

unsigned long clock_freq = 16000000;
// Create an unsigned int variable called baud_rate and set it to 9600
// Your code here

Need a hint?

The baud rate is the speed of communication in bits per second.

3

Calculate baud rate register value

Create an unsigned int variable called baud_reg and calculate its value using the formula: baud_reg = (clock_freq / (16 * baud_rate)) - 1;

Embedded C

unsigned long clock_freq = 16000000;
unsigned int baud_rate = 9600;
// Calculate baud_reg using the formula and assign it
// Your code here

Need a hint?

This formula is common for UART baud rate calculation in many microcontrollers.

4

Print baud rate register value

Use printf to print the text "Baud rate register value: " followed by the value of baud_reg.

Embedded C

unsigned long clock_freq = 16000000;
unsigned int baud_rate = 9600;
unsigned int baud_reg = (clock_freq / (16 * baud_rate)) - 1;
// Print the baud_reg value
// Your code here

Need a hint?

Use printf("Baud rate register value: %u\n", baud_reg); inside main().