Sleep modes overview in Embedded C - Mini Project: Build & Apply

Sleep Modes Overview

📖 Scenario: You are working on a small embedded system that needs to save power when it is not actively doing work. To do this, the system can enter different sleep modes that reduce power consumption.Each sleep mode has a different level of power saving and wake-up time. You want to create a simple program that shows how to set and use these sleep modes.

🎯 Goal: Build a program that defines sleep modes, sets a current sleep mode, and prints the selected mode to the console.

📋 What You'll Learn

Define an enum for sleep modes with exact names and values

Create a variable to hold the current sleep mode

Write a function to set the sleep mode

Print the current sleep mode name

💡 Why This Matters

🌍 Real World

Embedded systems often need to save power by entering different sleep modes when idle. This project shows how to manage those modes in code.

💼 Career

Understanding sleep modes and how to control them is important for embedded software developers working on battery-powered or low-power devices.

1

Define sleep modes enum

Define an enum called SleepMode with these exact members and values: ACTIVE = 0, IDLE = 1, STANDBY = 2, OFF = 3.

Embedded C

// Your code here

Need a hint?

Use typedef enum { ... } SleepMode; to define the sleep modes.

2

Create current sleep mode variable

Create a variable called currentMode of type SleepMode and set it to ACTIVE.

Embedded C

typedef enum {
    ACTIVE = 0,
    IDLE = 1,
    STANDBY = 2,
    OFF = 3
} SleepMode;

// Your code here

Need a hint?

Declare currentMode as type SleepMode and assign ACTIVE.

3

Write function to set sleep mode

Write a function called setSleepMode that takes a parameter mode of type SleepMode and sets currentMode to mode.

Embedded C

typedef enum {
    ACTIVE = 0,
    IDLE = 1,
    STANDBY = 2,
    OFF = 3
} SleepMode;

SleepMode currentMode = ACTIVE;

// Your code here

Need a hint?

Define setSleepMode to update currentMode.

4

Print current sleep mode

Write a main function that calls setSleepMode(STANDBY) and then prints the text "Current sleep mode: STANDBY" using printf.

Embedded C

typedef enum {
    ACTIVE = 0,
    IDLE = 1,
    STANDBY = 2,
    OFF = 3
} SleepMode;

SleepMode currentMode = ACTIVE;

void setSleepMode(SleepMode mode) {
    currentMode = mode;
}

// Your code here

Need a hint?

Call setSleepMode(STANDBY) and print the message exactly.