This document summarizes an embedded operating system final project presentation. The project involves developing an OS for group buying functionality. The presentation outlines the user guide, architecture, OS applications, I/O devices, and demonstrations of the system. The system allows users to search for groups, create groups, join groups, and receives notifications when a group is full. It uses multiple threads, semaphores, mutexes, and signals to synchronize data and notifications across client-server communication. Demonstrations show the behavior of multiple clients creating and joining groups simultaneously and receiving signals when a group is filled.

1. Embedded Operating System
Professor：Huang,Yu-Lun
Final Project Presentation
Students:曾俊穎 王瀚君
---團購趣

2. Outline
1. User Gide
2. Architecture
3. OS Application
4.IO Device
5. Demo (keypad , 7segment)

3. User GuidePress “D” to decide options
Logout
Start Search
True
False
Join groups
Create group
False
True Group name
EMPTY
Group
<Menu>
<Menu>
Return
fail
<Menu>
Return
End
Group name : apple
Quantity(goal) : 50
Quantity(current) : 37
Time : 19:00
Location : nctu
Press “#” to leave or return
Fill Conditions
Fill amount
fail
success
success
<Menu>
Return
<Menu>
Return
<Menu>
Return
<Menu>
Return
Database

4. When notification is coming
signal turn on LED +
Show notification
If Press
button?
Timer count
down
Turn off LED
Clear notification
Input item?
___
***********************
*the group is full!!!

5. 可展示功能
•搜尋是否有團
•創團
•加團
•滿團通知
•同一時間只能創同一種團
•同一時間只有一人可以加進最後名額

6. Architecture
•Client:
• Sending thread: sending request
• Recving thread: receiving response
•Server:
• Main thread: 處理request和response

7. OS Application
•Multi-thread
•Semaphore:
• 為了要接收及時通知，Client 端拆成兩個thread，但在重要時刻彼
此又需要同步
• Mutex:
• Server 對database的保護
•Signal
•Timer

8. Device--keypad
1 (abc) 2 (def) 3 (ghi) A Delete
4 (jkl) 5 (mno) 6 (pqr) B Up
7 (stu) 8 (vwx) 9 (yz ) C Down
* Mode 0 # Return D Enter

9. Device-- 7segment
0 0 1 0 ----->
----->
----->
0 1 0 0
1 0 0 0
0 0 0 9
0 0 5 9
0 9 5 9

10. Demo1.兩個client(A , B)的情況下
A開團, B跟團, 並在成團當下的畫面.
2.三個client(A , B , C)的情況下
A開團, B跟團但尚未成團,直到C跟團才成團.
3.兩個client(A , B)同時創團的情況
A創團, B創團同時開一樣的團.若A成功,B將被告知創團失敗.
4.兩個client(A , B)同時填寫數量的情況
A加團, B加團同時停在填寫數量畫面.若A最快,B將被告知加團失敗.
5.成團時,系統給signal提示
6.基本I/O展示
倒數計時,delete功能,..等

11. Thank You For listening