Texas Instruments TMS470R1x manual Getting Started With the C Compiler, Cl470 ±o ±mt funtion

Getting Started With the C Compiler

5.2 Getting Started With the C Compiler

The TMS470R1x C compiler consists of many phases, including parsing, opti- mization, and code generation. The simplest way to compile is to use the shell program, which is included with the compiler. This section provides a quick walkthrough so that you can get started without reading the entire TMS470R1x Optimizing C Compiler User's Guide.

1) Create a sample file called function.c that contains the following code:

/**************************************/

/*	function.c	*/
/*	(Sample file for walkthrough)	*/

/**************************************/ int main(int i)

{

return(i < 0 ? ±i : i );

}

2)To invoke the shell program to compile and assemble function.c, enter: cl470 ±o function

By default, the TMS470R1x shell program compiles and assembles 32-bit instructions. To compile 16-bit instructions, use the ±mt option:

cl470 ±o ±mt funtion

The shell program prints the following information as it compiles the pro- gram:

[function]
TMS470 ANSI C Compiler		Version 1.20
Copyright (c) 1995±1997		Texas Instruments Incorporated
ºfunction.cº	==> main
TMS470 ANSI C Optimizer		Version 1.20
Copyright (c) 1995±1997		Texas Instruments Incorporated
ºfunction.cº	==> main
TMS470 ANSI C Codegen		Version 1.20
Copyright (c) 1995±1997		Texas Instruments Incorporated
ºfunction.cº:	==> main
TMS470 COFF Assembler		Version 1.20
Copyright (c) 1995±1997		Texas Instruments Incorporated
PASS 1
PASS 2

No Errors, No Warnings

By default, the shell deletes the assembly language file from the current directory after the file is assembled. If you want to inspect the assembly language output, use the ±k option to retain the assembly language file:

cl470 ±o ±k function

Getting Started With the Code Generation Tools 5-7