What is the Cortex-M3 chip structure and the basic structure of CMSIS-based applications?

This article will explain in detail about the Cortex-M3 chip structure and the basic structure of CMSIS-based applications. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Figure 1. Cortex-m3 chip structure

Figure 2. Based on the basic structure of CMSIS application

CMSIS is divided into three basic functional layers:

1) access layer inside and outside the core: the access provided by ARM defines the internal register address and function of the processor.

2) Middleware access layer: defines a general API for accessing middleware, which is also provided by ARM.

3) Peripheral access layer: define the address of the hardware register and the access function of the peripheral.

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