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MPS430的C与汇编语言的混合编程，单片机的程序例子

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Application Note

SLAA140 – March 2002

Mixing C and Assembler With the MSP430

Stefan Schauer MSP430

ABSTRACT

This application note describes how C and assembler code can be used together within

an MSP430 application. The combination of C and assembler benefits the designer by

providing the power of a high-level language as well as the speed, efficiency, and low-

level control of assembler.

Contents

1 Definition of the IAR C-Compiler for Passing Variables Between Functions ...........................2

2 Requirements of Assembler Routines to Support Being Called From C..................................3

3 Combining C and Assembler Functions .....................................................................................4

4 Building Libraries .........................................................................................................................6

5 Using Watch Windows With Assembler Variables .....................................................................8

Figures

Figure 1.Parameter Passing From C ..................................................................................................2

Tables

Table 1. Location of Passed Parameters...........................................................................................3

SLAA140.

4 Mixing C and Assembler With the MSP430

If the C code is compiled with -ur45, but the application is not to run in the ROM monitor, then it

is possible to use R4 and R5 in the assembler routine without saving them, since the C code

never uses them.

2.2 Interrupt Functions

The calling convention cannot be used for interrupt functions, since the interrupt may occur

during the calling of a foreground function. Hence, the requirements for an interrupt function

routine are different from those of a normal function routine as follows:

• The routine must preserve all used registers, including scratch registers R12–R15.

• The routine must exit using RETI.

• The routine must treat all flags of the status register as undefined (Carry / Neg. / Zero /

Overflow).

2.3 Defining Interrupt Vectors

As an alternative to defining a C interrupt function in assembly language as described above, the

user is free to assemble an interrupt routine and install it directly in the interrupt vector.

The interrupt vectors are located in the INTVEC segment.

3 Combining C and Assembler Functions

3.1 General Basics

The mechanics to combine C and assembler functions are fairly straightforward. Basically C

code within .c files imports labels exported by the assembler files using the extern keyword.

Assembler codes within .s43 files export labels to the C code using the PUBLIC keyword.

Assembler code import labels exported by C code using the EXTERN keyword. No keyword is

required to export C labels to assembler code.

Once the .c and .s43 files are written, they are added to the workbench project and the project is

built. See the example .c, .s43, and project (.prj) files included with this application note. See the

IAR documentation for a more complete description of this process.

3.2 Calling Assembler Functions Without Parameters to Pass

If no parameters have to be passed between the C code and the assembler function, a simple

call instruction can be used. See example 1.

3.3 Calling Assembler Functions With Parameters to Pass

When it is required to pass parameters from C to the assembler function, the parameters must

be located as described in the Stack Frames and Parameter Passing section.

Example 2 shows how parameters are passed between the C main program and an assembler

function.

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