How much indirection is too much?

Asked by: Edilberto Stakelbeck

What is a level of indirection?

“Indirection” is using something that uses something else, in its broadest sense. So your example, using a pointer of a value instead of the value, fits this definition at one level. The pointer is the something and the value is the something else.

How many levels of indirection are there?

When set-builder notation is employed the statement Δ={α} means the set of all formulae — so although the reference is to α there are two levels of indirection here, the first to the set of all α and then the second to a specific formula for each occurrence of α in the set Δ.

Is abstraction good or bad?

You have to bear in mind that no abstraction is actually better than the wrong abstraction. Using proper abstractions in your app helps to maintain it over time, but if you’re doing it wrong, you’re adding unnecessary complexity to the project, which can be hard to understand in the future.

How many layers of abstraction are you on?

The OSI model comprises seven abstraction layers.

What is indirection C?

An indirection in C is denoted by the operand * followed by the name of a pointer variable. Its meaning is “access the content the pointer points to”. Unfortunately, this operator is the same as the one to denote pointer data types when declaring pointer variables.

What is indirection in relation to pointers?

The indirection operator is a unary operator that can be used to obtain the value stored at the memory location referenced by a pointer variable. The indirection operator must precede the pointer variable name, with no intervening space.

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How many levels of pointers can you have?

This is called levels of pointers. According to ANSI C, each compiler must have at least 12 levels of pointers. This means we can use 12 * symbols with a variable name. Level of pointers or say chain can go up to N level depending upon the memory size.

What is indirection in Java?

Indirection allows you to retrieve objects from the database as needed. With indirection turned off, when an object is retrieved from the database all the other objects that it references are also retrieved. With indirection turned on, each object is retrieved from the database only when asked for.

What is abstraction layer in programming?

What is an abstraction layer? The abstraction layer creates a separation between two things. For programming, this is often splitting tasks into separate entities. For example, an entity A might be assigned the task of fetching an image from a database and then processing the image when retrieved.

What is the highest level of abstraction?

the entire system

The highest level of abstraction is the entire system. The next level would be a handful of components, and so on, while the lowest level could be millions of objects. See abstraction layer.

What are the four levels of abstract language?

The Ladder of Abstraction

Level Four: Abstractions Examples: Life, beauty, love, time, success, power, evil, good
Level Two: More definite groups Examples: teenagers, middle-class, clothing industry, college campus, TV dramas, house plants

What is Hal driver?

In computers, a hardware abstraction layer (HAL) is a layer of programming that allows a computer OS to interact with a hardware device at a general or abstract level rather than at a detailed hardware level. HAL can be called from either the OS’s kernel or from a device driver.

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What is the difference between HAL and driver?

HAL Architecture



Most of the Vendor specific implementations can be done in Android HAL rather than the driver. So that license difference between the driver (Open source license GPL) and the HAL (Apache License) will give more level of abstraction to vendor.

Is HAL still used?

HAL is now deprecated on most Linux distributions and on FreeBSD. Functionality is being merged into udev on Linux as of 2008–2010 and devd on FreeBSD. Previously, HAL was built on top of udev. Some other OS-es which don’t have an alternative like udev or devd still use HAL.

Is HAL bare metal?

Bare-metal term includes HAL. It means everything, that doesn’t run some sort of operating system.

Is Cmsis bare-metal?

CMSIS: Supporting Arm Cortex-A class devices



Today, more and more Arm Cortex-A class devices are available that can be used as high-performance microcontrollers, running bare-metal software or a real-time operating system.

How do you program a STM?

To program the STM32:

  1. create a new project in STM32CubeIDE.
  2. in Target Selection Tool, select the appropriate microcontroller or Evaluation Board.
  3. give your project a name.
  4. in Device Configuration Tool initialize all the necessary peripherals.
  5. generate a project.
  6. complete this project with your code.

What is Hal STM32?

The STM32 Hardware Abstraction Layer (HAL) provides a simple, generic multi-instance set of APIs (application programming interfaces) to interact with the upper layers like the user application, libraries and stacks.

How do I learn STM32?

2 STM32 step by step↑

  1. Step 1: Tools installation and first test. Install the main tools to program STM32 and run a first example: …
  2. Step 2: Blinking LED with STM32CubeMX and HAL. …
  3. Step 3: UART and new board introduction. …
  4. Step 4: Sensors usage with B-L475E-IOT01A. …
  5. Step 5: Build an IOT system.
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What does HAL stand for STM?

The STM32Cube Hardware Abstraction Layer (HAL), an STM32 abstraction layer embedded software ensuring maximized portability across the STM32 microcontroller. The HAL is available for all the hardware peripherals.