stm8, cpu register, cosmic

Hello

How can I access CPU registers using the Cosmic compiler?

For example, when I access register A, the compiler throws an error A is undefined (This is shown in the picture and also the project files).

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AnsBest answer

Associate III

You've to define address for any register. Check datasheet and see what's the address of A register and then define it accordingly.
Checkout this guide: https://lujji.github.io/blog/bare-metal-programming-stm8/

AnsBest answer

Associate III

You've to define address for any register. Check datasheet and see what's the address of A register and then define it accordingly.
Checkout this guide: https://lujji.github.io/blog/bare-metal-programming-stm8/

ST Technical Moderator

Hello,

If "A" is a an internal core register you need to access it in assembly language.

If "A" is a peripheral register you need to define the address of "A" and access it by pointer in C.

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