Hardware Abstraction Layer in embedded systems
Hardware abstractions often allow programmers to write Many early computer systems did not have any form of hardware abstraction. resolution of sensor, temporal update frequency) may vary with hardware, an API can do little to hide that, other than by assuming a "least common denominator" model. This was a significant challenge to software developers since they then had to know how every hardware device in a system worked to ensure the software's compatibility. This was a significant challenge to software developers since they then had to know how every hardware device in a system worked to ensure the software's An example of this might be a "Joystick" abstraction. With hardware abstraction, rather than the program communicating directly with the hardware device, it com… Examples of "abstractions" on a PC include video input, printers, audio input and output, In certain computer science domains, such as operating systems or embedded systems, the abstractions have slightly different appearances (for instance, Operating Systems tend to have more standardized interfaces), but the concept of abstraction and encapsulation of complexity are common, and deep. This meant that anyone writing a program for such a system would have to know how each hardware device communicated with the rest of the system. This meant that anyone writing a program for such a system would have to know how each hardware device communicated with the rest of the system. The As physical limitations (e.g. They both have commonalities (e.g., you must steer) and physical differences (e.g., use of feet). This is especially important for "Hardware Abstraction Layer" redirects here. A good metaphor is the abstraction of transportation. For the UNIX-like operating system subsystem, see The "wheeled terrestrial transport" function is abstracted and the details of "how to drive" are encapsulated. Thus, certain deep architectural decisions from the implementation may become relevant to users of a particular instantiation of an abstraction. Many early computer systems did not have any form of hardware abstraction.
Operating systems having a defined HAL are easily portable across different hardware. One can always specify the abstraction "drive to" and let the implementor decide whether bicycling or driving a car is best. Both bicycling and driving a car are transportation.
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