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September 2008

Tynamo(TM) Home

by night.kame

Welcome to the home page of Tynamo™, a fast, conditionally compliant HTTP/1.1 server and Servlet 2.2 container for embedded Java platforms.

"Oh My Gosh" comme on dit dans EM:HE.

July 2008

Commands of the NAND

by YukuanBlog
相信處理過 NAND flash 的 firmware 人員,在啃讀 datasheet 的過程,難免得謹慎地交叉比對,好好推敲那也佔了不少篇幅的時序圖,以免自己還是不夠小心,誤解文意……

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June 2008

NAND Flash 簡介

by YukuanBlog
撬開一張 SD 卡,裡面最引人注目的,當然就是那大大一顆的 NAND flash ,我們餵給 SD 卡的資料都儲存在裡面。在這顆 NAND flash 的旁邊,我們還可看到一顆小一號的 IC ,那就是 NAND flash 的 controller 。 SD 卡儲存的資料要安全可靠,有九成的責任都要算在這顆 controller 。

The Floating Gate

by YukuanBlog
浮動閘(floating gate)一詞會讓我銘記於心,是因為閱讀了《矽眼》,該書提到以浮動閘紀錄類神經元突觸加權值,這是「類比」儲存的一個應用。然而,對多數內嵌系統設計人員來說,浮動閘是用在「數位」儲存的,諸如 EPROM, EEPROM, NOR flash, NAND flash 等。

The Analog Clock

by YukuanBlog
……秒針急急忙忙的去撥動每一根短棒,使它們產生意義。然後分針慢吞吞的做同樣的事,使那些短棒產生另一種意義。三種針的位置和關係不斷變更,在錶面上切割出許多角來,夾住那不可捉摸的時間。……(摘自作文七巧:P86)

May 2008

The Fraction from a Decimal

by YukuanBlog
定點數運算常用於 embedded systems 中,因為大部分低階的 MCU (例如: 8051, PIC, AVR 等)開發環境雖提供浮點運算,卻是軟體模擬的,除了慢,還明顯佔用原本就少得可憐的記憶體空間。 C/C 語言雖無定點數運算專用語法,程式員卻可通過手動調整,有效以整數運算完成相同效果。

April 2008

Fingering of Keys

by YukuanBlog
按鍵是很普遍的人機介面,也常用於內嵌系統(Embedded Systems)。既然大家那麼愛用按鍵,很自然地, Embedded Systems 軔體開發人員就常常得處理按鍵的偵測、編碼等議題。此外,為了按鍵操作流暢,我們還必須為按鍵設計適當的指法(fingering)及明確、統一的功能定義(function definition)。

February 2008

Sphinx - Free open-source SQL full-text search engine

by Xavier Lacot & 3 others
Sphinx is a standalone search engine, meant to provide fast, size-efficient and relevant fulltext search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages. Currently built-in data sources support fetching data either via direct connection to MySQL or PostgreSQL, or using XML pipe mechanism (a pipe to indexer in special XML-based format which Sphinx recognizes).

July 2007

June 2007

HOWTO: Writing a Computer Emulator

by mapleelpam
怎样写一个计算机模拟器 的原文

April 2007

March 2007

Embedded Web Server -- AppWeb is Secure, Fast and Compact

by Xavier Lacot
AppWeb is a very fast, small-footprint, standards-based, portable server, specifically developed for use by embedded devices and applications.

February 2007

January 2007

December 2006

Linux 是不是應該有 Binary Driver Layer ?

by mapleelpam
GKAI(General Kernel API Interface) 滿深入的討論

Motor-controlling PWMs

by YukuanBlog
一個脈寬調變(Pulse-width Modulation, PWM)訊號可控制一顆 DC motor 轉速,或決定一具 servo motor 的方向、位置或轉速。在複雜的機器人身上,常用上好幾顆馬達,因而能以一顆微控制器(microcontroller, uC)產生多組 PWM 訊號是非常實用的。

Software Anti-interference

by YukuanBlog
為了維持機器正常運作,除了硬體設計上要把雜訊干擾納入考量外,軟體也不可以坐以待斃,以下整理一些簡單、低階的軟體抗雜訊手段:

November 2006

Master Code from embedded.com

by mapleelpam
收集從1989年到2006每一年的Master Code

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