C166: Using Macros with In-line Assembly

Information in this article applies to:

• C166, version 5

QUESTION

I have defined the following macro that should generate an ATOMIC instruction that will block interrupts for n instructions.

#define DisableIRQ(n) __asm { atomic #n }

However, the macro does not work. The pound character ('#') is the stringize macro operator which converts n into a string.

Is there a way to avoid this?

ANSWER

Yes. Put n inside parentheses. For example:

#define DisableIRQ(n) __asm { atomic #(n) }

The parentheses prevent string conversion.

MORE INFORMATION

• Refer to Stringize (#) in the C166 User's Guide.
• Refer to Extended Inline Assembly in the C166 User's Guide.

Last Reviewed: Thursday, February 25, 2021