[Bug]: Discrepancy in __NVIC_PRIO_BITS default value between core_cm4.h and CMSIS-Core Documentation

[Yahia-Sameh]

Bug Summary

a mismatch between Documentation and Header

Detailed Description

Summary of the Issue

There is a discrepancy between the default value of __NVIC_PRIO_BITS listed in the CMSIS-Core documentation table and the actual default fallback value implemented in core_cm4.h.

Location

• Documentation: CMSIS-Core (Cortex-M) -> Device Header File <device>.h -> Cortex-M4 core (core_cm4.h) table.
• Header File: CMSIS/Core/Include/core_cm4.h

Description of Discrepancy

1. CMSIS Documentation Table: Lists the Default value for __NVIC_PRIO_BITS as 4.
2. core_cm4.h Header File: Defines the default fallback value as 3U inside the #ifndef block:

   #ifndef __NVIC_PRIO_BITS
     #define __NVIC_PRIO_BITS 3U
     #warning "__NVIC_PRIO_BITS not defined in device header file; using default!"
   #endif

Expected Behavior

No response

Actual Behavior

No response

Environment

No response

Severity

Minor