Fall-2019-Operating-Systems

Implementation of a multi-threading package in C language and some test-cases.

Requirements

You need Edsim51 to simulate 8051 processor and SDCC to generate Edsim51-targeted files.

• Edsim51

  • From http://edsim51.com/
  • Runs as a Java app
  • DI version simulates a complete embedded system
  • LCD, LEDs, keypad, bank of buttons, ADC, DAC
  • cycle-accurate processor

• SDCC for Edsim51

  • From http://sdcc.sourceforge.net/
  • SDCC: Small Device C Compiler
  • Open source, free, cross-platform

Contents

ppc stands for programming project checkpoint.

• ppc 1: cooperative thread-switching
• ppc 2: preemptive thread-switching
• ppc 3: semaphore + bounded-buffer example
• ppc 4: two producers and one consumer example
• ppc 5: delay function + parking lot example

Each ppc is based on the previous one.

Usage

1. In each ppc directory, use make command to generate .hex file.

   

   The warning 85 can be ignored.

2. Click Load in Edsim51 simulator and select the generated .hex file.

   

3. Click Assm.

   

4. Now you can click Run to execute or Step to execute by one step.

   You can modify the Update Freq. to change the execution speed.

5. If you modify the source code, then you need to use make clean to remove old .hex file and re-generate.

   

Contact

Feel free to email me at khchen.me@gmail.com or open an issue here if you have any ideas.