Programming_Embedded_System_I.pdf

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Microsoft Word - PES I guide .
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Copyright © Michael J. Pont, 2002-2003
This document may be freely distributed and copied, provided that copyright notice at
the foot of each OHP page is clearly visible in all copies.
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Seminar 1: “Hello, Embedded World”
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Overview of this seminar
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Overview of this course
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By the end of the course …
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Main course textbook
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Why use C?
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Pre-requisites!
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The 8051 microcontroller
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The “super loop” software architecture
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Strengths and weaknesseses of “super loops”
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Example: Central-heating controller
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Reading from (and writing to) port pins
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SFRs and ports
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SFRs and ports
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Creating and using sbit variables
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Example: Reading and writing bytes
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Creating “software delays”
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Using the performance analyzer to test software delays
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Strengths and weaknesses of software-only delays
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Preparation for the next seminar
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Seminar 2: Basic hardware foundations (resets, oscillators and port I/O)
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Review: The 8051 microcontroller
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Review: Central-heating controller
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Overview of this seminar
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Oscillator Hardware
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How to connect a crystal to a microcontroller
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Oscillator frequency and machine cycle period
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Keep the clock frequency as low as possible
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Stability issues
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Improving the stability of a crystal oscillator
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Overall strengths and weaknesses
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Reset Hardware
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More robust reset circuits
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Driving DC Loads
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Use of pull-up resistors
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Driving a low-power load without using a buffer
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Using an IC Buffer
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Example: Buffering three LEDs with a 74HC04
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What is a multi-segment LED?
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Driving a single digit
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Preparation for the next seminar
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Seminar 3: Reading Switches
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Introduction
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Review: Basic techniques for reading from port pins
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Example: Reading and writing bytes (review)
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Example: Reading and writing bits (simple version)
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Example: Reading and writing bits (generic version)
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The need for pull-up resistors
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The need for pull-up resistors
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The need for pull-up resistors
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Dealing with switch bounce
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Example: Reading switch inputs (basic code)
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Example: Counting goats
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Conclusions
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Preparation for the next seminar
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