ARMCC: VARIABLES IN NON-VOLATILE MEMORY

Information in this article applies to:

• RealView C Compiler Version 3
• RealView Microcontroller Development Kit 3.04

QUESTION

How can I locate variables in the non-volatile memory area? µVision offers the checkbox Project — Options — Target — NoInit. But this is not enough, because my variables are zero initialized.

ANSWER

In addition to setting of the NoInit checkbox, you must define the variables using the zero_init attribute as shown below.

__attribute__((zero_init)) int i;

MORE INFORMATION

• RV Compiler Introduction (available in µVision)
• RealView Compilation Tools Compiler and Libraries - Variable Attributes
• RealView Compilation Tools Linker and Utilities User's Guide - Using Scatter-loading Description Files

FORUM THREADS

The following Discussion Forum threads may provide information related to this topic.

• NOINIT in Keil Real View Compiler
• Locating Variables in non volatile areas.
• STR9 -NOINIT- Variable on powerup or reset

Last Reviewed: Tuesday, January 30, 2007