Analog Devices ADSP-2181 EZ-KIT-LITE Software UART Implementation

This is a technical note on how to implement a software UART on the ADSP-2181 EZ-KIT-LITE.

Brand: Analog Devices
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 28
File format: PDF
File size: 235 KB
Published: 03 August, 2012
Updated: 30 September, 2023
Model: ADSP-2181
MD5 checksum: 1B3B6918FEE81798E19601E76B317B96
PDF: Analog Devices ADSP-2181 EZ-KIT-LITE Software UART Implementation PDF

About this manual

This document describes a software implementation of a Universal Asynchronous Receiver Transmitter (UART) running on the ADSP-2181 EZ Kit Lite. It provides background on serial communication and details the hardware configuration using the ADM232AAR line driver to interface with RS-232 devices.

The software section outlines the data format, program flow, and specific routines for automatic baud rate detection, initialization, bit processing interrupts, and transmission. The note includes a table of timer constants for common baud rates when the processor runs at 33 MHz.

What's inside

Introduction
Serial Communication
Asynchronous Serial Communication
Universal Asynchronous Receiver/Transmitter
Hardware Configuration
Data Format
Program Flow
Automatic Baud Rate Detection
Initialization Routine
Bit Processing Interrupt

Specifications

Processor Frequency	33 MHz
Supported Baud Rates (Autobaud)	2400, 3600, 9200 and 19200 baud
Data Bits	8 data bits
Parity Bit	No parity bit
Start/Stop Bits	1 start bit and 1 stop bit

Frequently asked questions

What baud rates can the autobaud feature detect?

The autobaud feature can detect 2400, 3600, 9200, and 19200 baud.

What data format does the UART program support?

The program supports 8 data bits with no parity bit, adding 1 start and 1 stop bit automatically.

What character is used for automatic baud rate detection?

The user should transmit an ASCII '8' character to the EZ Kit Lite board at restart.

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