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Programming Embedded System II (8051).pdf

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Programming Embedded System II (8051).pdf

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第十五届蓝桥杯嵌入式组省赛完整工程

该工程代码实现了第十五届蓝桥杯嵌入式组程序设计题目要求。

Programming

Embedded

Systems II

A 10-week course, using C

‘8051’

P3.0

P1.7

RST

P1.6

P1.5

P1.4

P1.2

P1.3

P1.1

P1.0

VSS

XTL2

XTL1

P3.7

P3.6

P3.5

P3.3

P3.4

P3.2

P3.1

/ EA

P0.6

P0.7

P0.5

P0.4

P0.3

P0.1

P0.2

P0.0

VCC

P2.0

P2.2

P2.1

P2.3

P2.4

P2.5

P2.7

P2.6

/ PSEN

ALE

Michael J. Pont

University of Leicester

[v2.0]

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.

III

Seminar 1: 1

Seminar 2: A flexible scheduler for single-processor embedded systems 1

Overview of this seminar 2

Overview of this course 3

By the end of the course you’ll be able to … 4

Main course text 5

IMPORTANT: Course prerequisites 6

Review: Why use C? 7

Review: The 8051 microcontroller 8

Review: The “super loop” software architecture 9

Review: An introduction to schedulers 10

Review: Building a scheduler 11

Overview of this seminar 12

The Co-operative Scheduler 13

Overview 14

The scheduler data structure and task array 15

The size of the task array 16

One possible initialisation function: 17

IMPORTANT: The ‘one interrupt per microcontroller’ rule! 18

The ‘Update’ function 19

The ‘Add Task’ function 20

The ‘Dispatcher’ 22

Function arguments 24

Function pointers and Keil linker options 25

The ‘Start’ function 28

The ‘Delete Task’ function 29

Reducing power consumption 30

Reporting errors 31

Displaying error codes 34

Hardware resource implications 35

What is the CPU load of the scheduler? 36

Determining the required tick interval 38

Guidelines for predictable and reliable scheduling 40

Overall strengths and weaknesses of the scheduler 41

Preparations for the next seminar 42

Seminar 3: Analogue I/O using ADCs and PWM 43

Overview of this seminar 44

PATTERN: One-Shot ADC 45

PATTERN: One-Shot ADC 46

Using a microcontroller with on-chip ADC 47

Using an external parallel ADC 48

Example: Using a Max150 ADC 49

Using an external serial ADC 51

Example: Using an external SPI ADC 52

Overview of SPI 53

Back to the example … 54

Example: Using an external I

C ADC 55

Overview of I2C 56

Back to the example … 57

What is PWM? 58

PATTERN: Software PWM 59

Preparations for the next seminar 62

Seminar 4: A closer look at co-operative task scheduling (and some alternatives) 63

Overview of this seminar 64

Review: Co-operative scheduling 65

The pre-emptive scheduler 66

Why do we avoid pre-emptive schedulers in this course? 67

Why is a co-operative scheduler (generally) more reliable? 68

Critical sections of code 69

How do we deal with critical sections in a pre-emptive system? 70

Building a “lock” mechanism 71

The “best of both worlds” - a hybrid scheduler 75

Creating a hybrid scheduler 76

The ‘Update’ function for a hybrid scheduler. 78

Reliability and safety issues 81

The safest way to use the hybrid scheduler 83

Other forms of co-operative scheduler 85

PATTERN: 255-T

ICK SCHEDULER 86

PATTERN: O

NE-TASK SCHEDULER 87

PATTERN: ONE-YEAR SCHEDULER 88

PATTERN: STABLE SCHEDULER 89

Mix and match … 90

Preparations for the next seminar 91

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