CMSIS

Looks like the chip manufacturers have been busy:

The Cortex Microcontroller Software Interface Standard (CMSIS) answers the challenges that are faced when software components are deployed to physical microcontroller devices based on a Cortex-M0 or Cortex-M3 processor. The CMSIS will be also expanded to future Cortex-M processor cores (the term Cortex-M is used to indicate that). The CMSIS is defined in close co-operation with various silicon and software vendors and provides a common approach to interface to peripherals, real-time operating systems, and middleware components.
ARM provides as part of the CMSIS the following software layers that are available for various compiler implementations:

  • Core Peripheral Access Layer: contains name definitions, address definitions and helper functions to access core registers and peripherals. It defines also a device independent interface for RTOS Kernels that includes debug channel definitions.

These software layers are expanded by Silicon partners with:

  • Device Peripheral Access Layer: provides definitions for all device peripherals
    Access Functions for Peripherals (optional): provides additional helper functions for peripherals

CMSIS defines for a Cortex-M Microcontroller System:

  • A common way to access peripheral registers and a common way to define exception vectors.
  • The register names of the Core Peripherals and the names of the Core Exception Vectors.
  • An device independent interface for RTOS Kernels including a debug channel.

Sounds good and a quick inspection revealed CMSIS is applied to both STM32 and Stellaris LM3S controllers, so this could make swapping out various controllers from different manufacturers a whole lot easier!

Go over to ARM’s website to get the full spec.

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