Question

Embedded System Programming

What are the benefits and what are the drawback of using hardware abstraction (HAL macros and fuctions),

Answer 1

A hardware abstraction layer(HAL) is included in many OS to avoid modifying the OS kernel to run the program on computers with varying hardware architecture.

The major difference between macro and functions is , function is compiled and macro is preprocessed.

BENEFITS OF MACROS AND FUNCTIONS::

• Speed of Execution using Macro is Faster
• No Type Checking is done in Macro
• Macros are useful when small code is repeated many times
• Functions are useful when large code is to be written
• Using Function keeps the code length unaffected

DRAWBACKS OF MACROS AND FUNCTIONS::

• Use of macro can lead to side effect at later stages
• Speed of Execution using Function is Slower
• Macro does not check any Compile-Time Errors