Thread Package on Edsim51

Table of contents

• About the project
• How to run this project
  • Prerequisites
  • Simulation
• Reference
• Contact

About the project

This is an implementation of a multi-threading package in C language which targets Edsim51 simulator. This project consists of five checkpoints, each with a different test case

• checkpoint 1: cooperative thread-switching
• checkpoint 2: preemptive thread-switching
• checkpoint 3: semaphore + bounded-buffer test case
• checkpoint 4: two producers & one consumer test case
• checkpoint 5: delay function + parking lot test case

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How to run this project

Prerequisites

One needs Edsim51 to simulate 8051 processor and SDCC to generate Edsim51-targeted files

• SDCC

  • Small device C compiler
  • Open source, free, cross-platform
  • Default ISA is Intel mds51

• Edsim51

  • An 8051 microcontroller simulator
  • Runs as a Java app
  • DI version - simulates a complete embedded system
  • SH version - customizable

Simulation

To get a local copy up and running follow these simple steps.

1. clone the repo

   git clone https://github.com/bob1113/thread-pkgs-on-edsim51.git

2. Change into checkpoint directory and compile via run make

   $make
   sdcc -c  testparking.c
   testparking.c:47: warning 158: overflow in implicit constant conversion
   testparking.c:73: warning 158: overflow in implicit constant conversion
   sdcc -c  preemptive.c
   preemptive.c:194: warning 85: in function ThreadCreate unreferenced function argument : 'fp'
   sdcc  -o testparking.hex testparking.rel preemptive.rel

   The warnings above can be ignored.

3. Choose the generated .hex file and click Load to load it into Edsim51

   

4. Click Assm to convert .hex file into assembly file

   

5. Click Run to execute

   

6. After finishing the simulation, one may clean up the generated files via run make clean

   $make clean
   del *.hex *.lst *.map *.mem *.rel *.rst *.sym *.asm *.lk

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Reference

• MCS® 51 Microcontroller Family User's Manual

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Contact

Bob Lai - bobolai1113@gmail.com
Project Link - https://github.com/bob1113/thread-pkgs-on-edsim51

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