CMSIS-Core (Cortex-A) implements the basic run-time system for a Cortex-A device and gives the user access to the processor core and the device peripherals. In detail it defines:
- Hardware Abstraction Layer (HAL) for Cortex-A processor registers with standardized definitions for the GIC, FPU, MMU, Cache, and core access functions.
- System exception names to interface to system exceptions without having compatibility issues.
- Methods to organize header files that makes it easy to learn new Cortex-A microcontroller products and improve software portability. This includes naming conventions for device-specific interrupts.
- Methods for system initialization to be used by each MCU vendor. For example, the standardized SystemInit() function is essential for configuring the clock system of the device.
- Intrinsic functions used to generate CPU instructions that are not supported by standard C functions.
- A variable to determine the system clock frequency which simplifies the setup of the system timers.
The following sections provide details about the CMSIS-Core (Cortex-A):
- Using CMSIS in Embedded Applications describes the project setup and shows a simple program example.
- CMSIS-Core Device Templates describes the files of the CMSIS-Core (Cortex-A) in detail and explains how to adapt template files provided by Arm to silicon vendor devices.
- MISRA-C Deviations describes the violations to the MISRA standard.
- Reference describe the features and functions of the Device Header File <device.h> in detail.
- Data Structures describe the data structures of the Device Header File <device.h> in detail.
CMSIS-Core (Cortex-A) in ARM::CMSIS Pack
Files relevant to CMSIS-Core (Cortex-A) are present in the following ARM::CMSIS directories:
|CMSIS\Core_A\Include||CMSIS-Core (Cortex-A) header files (for example core_ca.h, etc.)|
|Device||Arm reference implementations of Cortex-A devices|
|Device\_Template_Vendor||CMSIS-Core Device Templates for extension by silicon vendors|
CMSIS supports a selected subset of Cortex-A processors.
The following Technical Reference Manuals describe the various Arm Cortex-A processors:
The CMSIS-Core Device Templates supplied by Arm have been tested and verified with the following toolchains:
- Arm: Arm Compiler 5.06 update 6
- Arm: Arm Compiler 6.9
- Arm: Arm Compiler 6.6.2
- GNU: GNU Tools for Arm Embedded 6.3.1 20170620
- IAR: IAR ANSI C/C++ Compiler for Arm 18.104.22.16883