Embedded Programming with C

Embedded programming involves writing software to run on embedded systems, which are specialized computing systems designed to perform specific tasks.
The C language is widely used in embedded systems due to its efficiency, portability, and hardware control.

What is an Embedded System?

An embedded system consists of:

• Microcontroller or microprocessor

• Memory (ROM, RAM)

• Input/Output devices

• Embedded software

Examples:

• Washing machines

• Microwave ovens

• Automotive control systems

• Medical devices

Why C is Used in Embedded Systems

• Close to hardware

• Efficient execution

• Low memory usage

• Direct access to registers

• Portable across platforms

Key Concepts in Embedded C

1. Microcontroller Architecture

• CPU

• Registers

• Flash memory

• RAM

• I/O ports

• Timers and interrupts

2. Cross Compilation

• Program is compiled on a host system

• Executed on a target embedded system

3. Embedded C vs Standard C

4. Registers and Bit Manipulation

• Hardware is controlled using registers

PORTA |= (1 << 0);

5. Interrupts

• Used for handling real-time events

ISR(TIMER0_OVF_vect) {
    // interrupt code
}

6. Timers

• Used for delays and time-based operations

7. Memory Constraints

• Limited RAM and ROM

• Efficient coding is required

8. Embedded C Programming Example (LED Blink)

#include 
#include 

int main() {
    DDRB |= (1 << PB0>while (1) {
        PORTB ^= (1 << PB0>500);
    }
}

Embedded C Development Flow

1. Write source code

2. Cross compile using embedded compiler

3. Generate hex/bin file

4. Flash program into microcontroller

5. Test and debug

Common Embedded C Compilers

• AVR-GCC

• ARM GCC

• Keil

• MPLAB XC

Advantages of Embedded C

• High performance

• Reliable

• Hardware-level control

• Industry standard

Summary

• Embedded programming targets specialized hardware

• C is preferred for embedded systems

• Direct hardware access is essential

• Efficient memory usage is critical