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Jacob Foster
Jacob Foster

Download L HAL: Learn STM32F1 and STM32L4L4 Drivers with Practical Examples


How to Download l hal: A Guide for STM32 Users




If you are working with STM32 microcontrollers, you might have heard of l hal. But what is it exactly, and how can you download it? In this article, we will explain what l hal is, why you should use it, and how to download and use it in your projects. Let's get started!


What is l hal?




L hal stands for low-layer hardware abstraction layer driver. It is a software component that provides low-level access to the STM32 peripherals. It is part of the STM32CubeL4 embedded software package, which also includes the HAL driver, middleware components, and examples.




download l hal


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The difference between HAL and LL drivers




The HAL driver is a high-level abstraction layer that simplifies the user application implementation. It provides generic and extension APIs for all the STM32 peripherals. The HAL driver is feature-oriented, meaning that it groups the functions according to the peripheral functions, such as basic timer, capture, or PWM.


The LL driver is a low-level abstraction layer that offers hardware services based on the available features of the STM32 peripherals. It provides atomic operations that are closer to the hardware than the HAL driver. The LL driver is IP-oriented, meaning that it reflects exactly the hardware capabilities of each peripheral.


The benefits of using l hal




Using l hal has several advantages over using HAL or direct register access. Some of them are:


  • L hal is faster and lighter than HAL, as it does not require any additional memory resources or software configuration.



  • L hal is more flexible than HAL, as it allows you to customize your code according to your specific needs and preferences.



  • L hal is easier than direct register access, as it provides a consistent naming convention and a clear programming model for all the STM32 peripherals.



How to download l hal?




To download l hal, you need to follow these steps:


Step 1: Choose your STM32 series and part number




The first thing you need to do is to choose your STM32 series and part number. For example, if you are using an STM32L476RG microcontroller, your series is STM32L4 and your part number is STM32L476xx.


Step 2: Download the STM32CubeL4 package




The next thing you need to do is to download the STM32CubeL4 package from STMicroelectronics website. This package contains the HAL driver, the LL driver, middleware components, and examples for the STM32L4 series.


Step 3: Extract the stm32l4xx_hal_driver folder




After downloading the package, you need to extract it to a folder of your choice. Inside the folder, you will find a subfolder called Drivers, which contains the stm32l4xx_hal_driver folder. This folder contains the source code and header files of the HAL driver and the LL driver for the STM32L4 series.


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Step 4: Include the header files in your project




The last thing you need to do is to include the header files of the LL driver in your project. You can do this by adding the path of the stm32l4xx_hal_driver folder to your compiler's include directories. Alternatively, you can copy the header files to your project folder and include them directly in your source code. The main header file of the LL driver is stm32l4xx_ll.h, which includes all the other header files for each peripheral.


How to use l hal?




Now that you have downloaded and included l hal in your project, you can start using it to program your STM32 peripherals. Here are some general guidelines on how to use l hal:


Initialize and configure the peripherals




To initialize and configure a peripheral, you need to use the LL__Init function, where is the name of the peripheral. For example, to initialize and configure a UART peripheral, you need to use the LL_USART_Init function. This function takes two parameters: a pointer to the USART instance and a pointer to a structure that contains the configuration parameters. You can use the LL__InitTypeDef structure to define the configuration parameters for each peripheral.


Manage data transfers and interrupts




To manage data transfers and interrupts, you need to use the LL__Transmit and LL__Receive functions, where is the name of the peripheral. For example, to transmit and receive data using a UART peripheral, you need to use the LL_USART_Transmit and LL_USART_Receive functions. These functions take two parameters: a pointer to the USART instance and a data value. You can also use the LL__EnableIT and LL__DisableIT functions to enable and disable interrupts for each peripheral.


Handle errors and timeouts




To handle errors and timeouts, you need to use the LL__GetFlagStatus and LL__ClearFlag functions, where is the name of the peripheral. For example, to check and clear an overrun error flag using a UART peripheral, you need to use the LL_USART_IsActiveFlag_ORE and LL_USART_ClearFlag_ORE functions. These functions take one parameter: a pointer to the USART instance.


Conclusion




In this article, we have learned what l hal is, why you should use it, and how to download and use it in your projects. We have seen that l hal is a low-level abstraction layer that provides fast, light, and flexible access to the STM32 peripherals. We have also seen how to initialize, configure, manage, and handle errors using l hal functions.


Summary of the main points




  • L hal stands for low-layer hardware abstraction layer driver.



  • L hal is part of the STM32CubeL4 embedded software package.



  • L hal is faster, lighter, and more flexible than HAL.



  • To download l hal, you need to choose your STM32 series and part number, download the STM32CubeL4 package, extract the stm32l4xx_hal_driver folder, and include the header files in your project.



  • To use l hal, you need to initialize and configure the peripherals using LL__Init functions, manage data transfers and interrupts using LL__Transmit, LL__Receive, LL__EnableIT, and LL__DisableIT functions, and handle errors and timeouts using LL__GetFlagStatus and LL__ClearFlag functions.



FAQs




  • What is STM32CubeL4?



STM32CubeL4 is an embedded software package that includes HAL driver, LL driver, middleware components, and examples for STM32L4 series microcontrollers.


  • What is HAL?



HAL stands for high-level hardware abstraction layer driver. It is a software component that provides generic and extension APIs for all STM32 peripherals.


  • What is direct register access?



Direct register access is a method of programming STM32 peripherals by manipulating their registers directly without using any abstraction layer.


  • How can I find out my STM32 series and part number?



You can find out your STM32 series and part number by looking at the label on your microcontroller or by using the STM32CubeMX software tool.


  • Where can I find more examples and documentation on how to use l hal?



You can find more examples and documentation on how to use l hal in the STM32CubeL4 package, which you can download from STMicroelectronics website. You can also refer to the STM32L4 low-layer drivers user manual for more details.


I hope you enjoyed this article and learned something new. If you have any questions or feedback, please feel free to leave a comment below. Thank you for reading!


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