This directory contains different HALs for SoCs supported by Zephyr. The following HALs are supported: atmel ------- The Atmel Software Framework (ASF) provides device header files and peripheral drivers for Atmel SoCs. cmsis ------- The ARM Cortex Microcontroller Software Interface Standard (CMSIS) defines a set of standard interfaces to ARM Cortex-M SoCs. libmetal -------- libmetal provides a HAL abstraction layer utilized by open-amp gecko ----- The Silicon Labs Gecko SDK provides device header files and peripheral drivers for all Silicon Labs Gecko devices: EFM32, EZR32 and EFR32. mcux ------- The NXP MCUXpresso Software Development Kit (MCUX) provides device header files and peripheral drivers for Kinetis, LPC, and i.MX SoCs. nordic ------- The Nordic Semiconductor Microcontroller Development Kit (MDK) provides device header files for the Nordic Semiconductor nRF5 SoCs. openisa ------- This directory contains HALs used to enable OpenISA's RISC-V development boards. pdl --- The Cypress Peripheral Driver Library (PDL) provides device header files and peripheral drivers for PSoC6 SoCs. stm32cube --------- ST Microelectronics STM32Cube SDK Provides CMSIS header files and two different porting layers HAL (hardware abstraction layer), and LL (low layers) enabling portability between different STM32 devices via standardized API calls. LL and HAL provide different level of porting on STM32 SoCs. They could be used independently, or mixed depending on the needs. For further information: http://www.st.com/en/ecosystems/stm32cube.html ti ------- Texas Instruments SimpleLink SDKs provide peripheral and WiFi driver libraries for the SimpleLink family of SoCs.