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First, the authors describe basic usage syntax for inline assembly (inline asm) embedded within C and C programs. Then they explain intermediate concepts, such as addressing modes, the clobbers list, and branching stanzas, as well as more advanced topics, such as memory clobbers, the volatile attribute, and locks are discussed for those who want to use inline asm in multithreaded applications.
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Information in this article applies to:
- C51 All Versions
QUESTION
How do I implement inline assembly in C51 using the ASM and ENDASM directives. I have read some of the knowledgebase articles relating to this problem, but I still cannot get it to work.
ANSWER
The following example program, MAIN.C, demonstrates some simple inline assembly.
The following rules apply to C51 inline assembly:
- To use #pragma ASM/ENDASM, you must set the Generate Assembler SRC File and Assemble SRC File source file compile options in µVision by right-clicking your source file name in the Project Workspace and selecting Options for File.
- When using the Generate Assembler SRC File and Assemble SRC File options in µVision, if there are no other C modules in your project, you must manually include the C51 Run-Time Library (C51S.LIB, C51C.LIB, or C51L.LIB).
MORE INFORMATION
- Refer to ASM in the Cx51 User's Guide.
- Refer to Interfacing C to Assembler in the Cx51 User's Guide.
SEE ALSO
FORUM THREADS
The following Discussion Forum threads may provide information related to this topic.
Dev C Inline Asm Example 1
Last Reviewed: Monday, April 8, 2013
Dev C++ Inline Asm Example Pdf
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