Try   HackMD

Interrupt, ISR, top half, bottom half and multiplexing

tags: C LANGUAGE interrupt ISR top half

Authors: WhoAmI, CrazyDog
email: kccddb@gmail.com
Date: 20221217
Copyright: CC BY-NC-SA

這裡只是提觀念, 沒有硬體設備 很難實驗

基本上要運用 OS 設計觀念, ISR 程式不能執行太久

以前 幫別的老師的研究生改過 程式, 他的毛病就是 ISR 做太久! 造成錯誤, 這也是很多 學過 微處理的朋友 很少注意的問題, 要運用 timer interrupt 分段處理

還有一家廠商 也是出現這問題, 有告訴他們總經理, 他們的問題出現在 遙控器. 有人亂按就出問題

書本與實務 還是有差距的
以前 通常 測試一環 有 老人與小孩的行為~不按牌理出牌,亂按!

Linux OS 就分 TOP half 與 BOTTOM half 來處理
最有名的就是 NIC (network interface controller) driver

再次提醒 OS 很重要

ISR (Interrupt Service Routine )

Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
  • The image format is not supported
Learn More →

Image Not Showing Possible Reasons
  • The image file may be corrupted
  • The server hosting the image is unavailable
  • The image path is incorrect
  • The image format is not supported
Learn More →

Last changed by 
 
pingulinux
0
442

Read more

Metric space, vector space, inner product space

Authors: CrazyDog, CrazyMonkeyemail: kccddb@gmail.comDate: 20230222

Mar 14, 2025
\mathcal{Probability \ Measure \ and \ Conditional \ Expectation}

Author: \mathcal{CrazyDog}, Ph.D. in Electrical Engineering, NCTUemail: kccddb@gmail.comDate: 20230910

Nov 4, 2024
使用 pthread 的 echo server (有bug! why?)

Author: WhoAmI Date: 20230523 email:kccddb@gmail.com Copyright: CC BY-NC-SA 《荀子‧勸學》不積跬步，無以至千里；不積小流，無以成江海。 I. Mutex variables MUST be declared with type pthread_mutex_t, and must be initialized before they can be used. II. 了解 pthread_mutex_lock / pthread_mutex_unlock 與可能問題和代價 III. 程式執行效率與startvation 等問題

Jul 11, 2024
QEMU linux kernel and rootfs (busybox-1.22.0 and linux-4.4.50)

Author: WhoAmIemail: kccddb@gmail.com

Dec 6, 2023
Read more from pingulinux
Published on HackMD