uart2xx.txt

tms320f206的c语言异步串口示例程序

Writing to the C2xx Asynchronous Serial Port in C V1.00

by Jeff Axelrod 3/26/97

Introduction

This program demonstrates how to write the C2xx asynchronous serial port
from the Texas Instruments C compiler. It is a C version of the uart.asm
file found in Example C-9 of Appendix C in the TMS320C2xx User's Guide
(SPRU127B). The program receives input from the serial port and echoes each
character as it is received.

Contents

 File         Description

 main.c       Main C module which initializes the serial port settings and
              contains the interrupt service routines.
              Header file included by main.c which contains all
 registers.h  memory-mapped registers which can be accessed in the C
              language.

 cvectors.asm Assembly file which generates the C2xx vectors including the
              reset, and serial transmit and receive vectors.

 c203.cmd     Linker command file describing memory map and sections for
              the C203.
 uart2xx.doc  This document (in Microsoft Word format).
 uart2xx.htm  This document (in HTML format).
 uart2xx.txt  This document (in plain text format).

 uart2xx.out  Executable file for sample C program to be loaded by C2xx
              simulator or hardware.

 build.bat    Batch file for building uart2xx.out using only the Texas
              Instruments toolset.
 rts2xx.lib   Runtime support library.

Usage

Just load serial.out into the debugger and then run it. Next, run a generic
terminal program such as Hyperterminal (included in Windows 95) and connect
the PC serial port to the serial port on the C2xx. Make sure to set the
baud rate to 9600 baud if running at 20 Mhz, or 19200 baud if running at 40
Mhz. If the device is functioning properly, you will see "c203 UART is
fine!" being transmitted repeatedly.

Modification

The baud rate and clock rate may be changed in the #define statements of
main.c. To build, just type build.bat from a DOS prompt. Or if using the
GODSP Code Composer development system, create a project with the following
files: rts2xx.lib, main.c, cvectors.asm, c203.cmd, and registers.h. Then
build as usual.