AN IMPLEMENTATION OF A SOFTWARE UART USING THE TMS320C25 (CONTAINS SCANNED TEXT)

When transmitting to and receiving data from a processing engine such as the TMS320C25 digital signal processor, it is common to encounter problems when interfacing to asynchronous devices. This chapter provides a look at software implementation of a Universal Asynchronous Receiver and Transmitter (UART) which enables communication with asynchronous serial devices with a minimum of external hardware.

Topics covered include:

- Characteristics of asynchronous communications

- Limitations of and reasons where use of a UART are justifiable

- An overview of the functions provided by a UART

- UART Implementation

- A list of References

- An appendix of source code

Supporting figures illustrate the following:

- UART word format and architecture

- Timer interrupt service routine

- Transmitter routine

- UART status word

- Receiver routine

- RS-232 interface

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.

(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
Trademarks, Important Notice!