use this code pom.xml
RISC-V qemu doesn’t log “PRIV” in every instruction
RISC-V qemu seems wrong because it doesn’t log “PRIV:” in every instruction in qemu.log. Even mret is execute and the mode is changed, it doesn’t log “PRIV”. To fix this:
Create a breadboard FPGA
We tried to ask GOWIN to let us generate the bitstream but seems they are not willing to open their standard, xilinx and altera has no hope too. So for education purpose we now go for build a simple one. We found the way to break logic into LUTs, so we want to build a […]
NOR vs NAND flash
i finally found the differences between NOR and NAND flash, but just dont know what is it
WordPress Theme to support post-views-counter
To make the plugin works, need to call wp_footer() in footer.php
ENC28J60 + Arduino
CS人如何同EE人溝通
首先，你要承認幾點先 千萬唔可以俾佢地知你知呢幾樣野，否則死得好慘 要不停贊美呢幾樣野
Arduino Function Generator
I am using Nano and AD9833 to build a simple function generator. Code in here https://gitlab.com/quantr/hardware/arduino-function-generator
Arduino + AD9833 using library by Rob Tillaart
Buy the board here : https://item.taobao.com/item.htm?spm=a1z09.2.0.0.6caf2e8dU9c4dS&id=590166217396&_u=6buhab0a8d9 Install the library, see below Make sure connect these pins to the board, total 5 pins, follow below Refer to https://github.com/RobTillaart/AD9833 , more examples in https://github.com/RobTillaart/AD9833/tree/master/examples
Arduino + AD9833
Buy from here. I am using the example from here but ignore the switch buttons. You need to add this zip into the library and make sure don’t install the other library call “AD9833”, very important
Program與輪廻之對比
我想探討一下用電腦program與佛教輪廻之對比，唯先你必需要明白佛教講的核心理論就是無我，無常 Program之空性體驗 當你寫一段program去令電腦運行時，你所寫的每一行代碼你都會解釋到它的用途，所以你會有一種非常實在的感覺，但當你越鑽越深的時候，你會發現一個有趣現象就是你認為一個好實在的個體，例如 int x，去到深處你會發現它消失不見，又或者它可以同時出現在不同的空間之中。這正正體驗到佛教所講的無我，無我的意思是一件物件必定是由多個因緣所組成，它要在特定時刻和經由特定情況先至可以顯露在你面前，program都是一樣，你看不到只是你編程功力不夠
TheDB發展戰略圖
Rotate button by Arduino
Refer to https://zhuanlan.zhihu.com/p/349824627 , buy from here
MCP4725 I2C DAC Breakout board
Bought from here Testing maximum frequency, around 800us
GY-4725 board
Bought from here. This code test maximum frequency, around 1ms period is peak Documents
計準NPN了
Main point: calculate Ib, we can do it by Ib=Ic / Beta min OR Ib=(Vb – 0.7) / Rb
syscall.c for STM32 + XCubeAI
Redis uses its own protocol to communicate between redis-server and redis-client
I thought db client sending plain text command (in SQL) to server and server parse the command. But I found Redis and Mysql client communicate to server via a custom protocol, that prove the client parse the command, not the server socat -v tcp-listen:8001,reuseaddr,fork tcp:localhost:6379
FPGA Research
This is a synthesis of a simple verilog program in vivado
“大中華程序員”及”大香港程序員”之定義
“紅色程序員”又或者”大中華程序員”之定義: “大香港程序員”之定義
Funny Toy : Oscilloscope
I got this electronic toy from Taobao, i want to have more experience on soldering and putting different components on the PCB and making them work. After 3 hours in soldering and 1 hour in debugging, i finally make it works https://v.youku.com/v_show/id_XNjAyNDAwNDY2OA==.html?spm=a2hje.13141534.1_3.d_1&scm=20140719.manual.240103.video_XNjAyNDAwNDY2OA== All documents here
Nucleo-L476RG DAC
砌機 : FPGA
Lattice FPGA比STM32簡單, 我應該可以搞得掂 用户手册： https://github.com/wuxx/icesugar-nano/blob/main/README.mdwin7串口驱动： https://github.com/wuxx/icesugar-nano/blob/main/doc/usbser.inf原理图及源码： https://github.com/wuxx/icesugar-nano 主要component其實得兩個: FGPA同粒Flash
CIO現象之觀察
已經同大部份嘅公營機構做過生意, 公營機構嘅IT部技術同hands-on氣氛同以下元素嘅關係 同以下元素有關係, 我解釋唔到點解, 但觀察得之係有一定關係
同香港啲阿叔嘅交流指引
香港有好多阿叔，業界學界商界全部都係由阿叔為主，同佢地只要係有少少聯絡，你都要好小心，以下是指引 香港唔存在”前輩”呢一層，我唔係話香港無人夠資格稱做前輩，而係真正稱得上係前輩嘅人太少，唔足以叫做一代人。所以要摒棄幻想，唔好諗住搞到啲阿叔去指導你，唔點你都算係咁。香港啲中小學生同年青人未知呢個事實，所以寫呢篇文。
同香港嘅IT人溝通之正確方法
香港啲技術人好小氣, 所以同佢地交流要好小心, 以下列出必需要注意嘅重點
Multimeter book, teach you how to build one
教學理念
其實香港啲IT教育大家心裏邊都覺得唔係太work, 至於點解唔work你問啲學生就知. 所以我打算宣揚呢個教學理念, 但係呢個理念太難(右圖), 所以先執行一個簡化版理念(左圖). 首先我地盡可能用自己開發嘅tool去教學生, 呢一點難度好大, 因為要求位老師真係實際咁開發到舊野出黎, 完整程度要足以教學, 咁樣可以收兩個好處, 老師保證足夠handson, 學生保證學到最handson嘅skill. 做到呢樣野相信教學會煥燃一新. 香港太多課程啲老師照稿讀, 根本自己就對自己所教嘅野無足夠深度嘅認識. 舉個例子, MIT嘅Operating system課程不單止老師可以創造一個OS, 佢地亦都可以帶領學生去創造一個OS, 而香港嘅OS課程只係吹下powerpoint, 抽少少concept寫少少C++就算數, 無論完整性都沒法同外國比. 又例如香港教compiler嗰班老師又有幾多個可以寫到一個完整compiler出黎, 咁樣仲走去教人唔知會教到啲咩知識出黎. 當老師真係攞得起自己舊野去教, 啲學生又學得識, 最後一步就係要啲學生投入返去開發個project, 咁老師同學生就會有一個可以共同進步嘅圈. 收到嘅好處就係啲學生唔會覺得老師無料, 老師唔會覺得學生廢. 係香港提出一啲會帶來改變嘅意見好危險, 我而家提出呢個理念肯定都好多人跳出黎插我, 佢地嘅原因不外乎就係話用人地嘅tool去教一樣收到好效果, 呢一點我都懶得去反駁.
Build a programmer for ATF22V10C using Arduino
https://www.ecstaticlyrics.com/electronics/ATF22V10C/ https://github.com/ole00/afterburner https://github.com/hansake/PLD_programmer
Arduino read/write AT24C256
Many examples not work from google, it is because it needs a delay after write operand, so i put delay(100)
Quantr-Logic + PLD
We are thinking of synthesis logic into FPGA but the task is quite complex, We found a new way to do what we want: We generate the jedec file and let the end user burn it into PLD. This brings us the ability to design logic from Quantr-Logic, kick a button, and burn it into […]
Shatin IVE library has great books
Shatin IVE library has great FPGA books, I think they have a long history in electronics.
ATMEGA328P default fuse
RISC-V Day Hong Kong 2023
thank you Professor Ray invited us to join
道教與IT
呢本書講道教, 其實IT同道教好多相似之處 1. 道教最開頭玩 [ 請雷 ] 同 [ 請聖 ], 因為朝庭有啲嘅做得唔好例如農業搞唔掂, 加上解釋唔到自然現象所以請神幫助. 道教認為自太初(姐係宇宙之初)有一啲叫天寶字符嘅野成形, 道教唔知呢啲圖形符號係乜黎, 只係知道佢有神力可以一用, 所以啲有道行嘅道士張佢寫係張紙到就可以用黎消災解難. 對比起IT, 啲IT人好多時都解釋唔到啲技術係乜, 公司唔掂無效率解決唔到, 班友搞唔掂唯由寫道符(Tender)請神, 但班友又唔神心請神變左請鬼. 呢本書都講如果道士寫符唔淨心就會走火入魔, 請左啲邪鬼上黎. 2. 道教根本係一個無乜哲學嘅宗教, 成單野就係一大群道士係到吹, 而道士同道士之間係無提出過任何質問, 總之你有你講我有我講, 大家唔好踢爆各玩各嘅, 成個宗教就係一個大型嘅俾面派對大家唔好阻住大家揾食. 你睇返而家IT界啲KOL, 個個都係講埋啲你阿媽係女人嘅野, 有時仲要講錯, 佢地係好唔鐘意有人對佢地提出質疑, 那怕個質疑只係一條簡簡單單嘅問題, 佢地都唔會回應而unfriend左你. 我試過問Emil Chan同方保僑係邊一方面嘅專家, 佢地都即刻block Q左我. 呢一點同道教嘅道士非常相似. 3. 皇帝有問題問啲道士, 例如天下係點形成, 運勢有咩走法咁, 啲道士會答到超級high level完全落唔到地嗰隻. 對比係印度同希臘啲哲學家, 使佢地答唔到, 佢地都會嘗試將個問題break down去啲細啲嘅問題去再解釋, 而道教係只會將你指來指去, 一時就太初點點點, 一時就啲鬼神點點點, […]
Funny lesson today to build few 8-bit registers
Teaching teens for electronics is a rewarding and fulfilling experience. Electronics is a fascinating field that combines creativity, logic, and problem-solving. By teaching teens for electronics, you can help them discover the joy of learning new skills, creating useful devices, and exploring the world of technology. You can also inspire them to pursue their passions, […]
獅子會IT部
15.8.2023IT 小姐組一次工作會議在IT小組主席張民傑獅兄、總監陸嘉暉獅兄、第二副總監梁鳳華獅姐 領導下訂定各項IT工作，肯定今年的工作計劃賣個關子：好快會有重要IT事情宣佈
香港好少教授做實作嘅原因
係香港，由其是CS同EE你好少見到教授做implement嘅原因不外乎以下兩個 如何改變呢一個現實 要有一群死士執行以下任務
教育界未必係教育界，性格黎講
香港嘅科研唔掂，由其是教育界嘅科研，因為佢地無”愛”。香港教育界當然有好多熱心教育嘅老師，但亦有好多人令教育界唔似教育界 1. 老師未必愛好和平 通常真係鐘意教人嘅人都會係比較和平，始終教人係一件神聖嘅事業。但係好多院校內鬥好嚴重，好多時候啲老師好鐘意鬥來鬥去，所以佢地一啲都唔愛好和平。 2. 其實教育界好多時都無乜包容 好多時候學生做錯少少野佢地會發火，無乜包容可言，學校理應係一個提供無限犯錯機會嘅地方，但相反，香港有好多學院根本唔容許人犯錯，無論係學生或者老師都係。舉個例子，youtube上大吧流浪教師，佢地都唔好話做錯野，只要做左少少人地睇唔順眼嘅野，就會被人搞掂。好多老師佢地嘅性格比公務員更加公務員，有突發事件，佢地會嬲。有啲唔係佢地plan左而出現左嘅事，佢地會發癲。總之佢地嘅性格係要跟預定計劃而行，任何人任何事只要中途殺出，佢地就會發狂。所以無論對人對事都無乜包容。 3. 老師根本就好小氣 學校呢個環境其實係一個好好俾人地小氣嘅環境，老師對上得幾個人佢地在乎，其它身邊嘅所有老師佢地可以盡性小氣一翻，小氣亦都可以好長久，姐係記仇。因為咁樣好多老師都無乜人際能力，舉個例子，兜口兜面打照乎可以無反應。 4. 香港嘅老師係按本子辦事嘅生物 一句講哂，跟課程教跟學校規舉。學校想點就點，大家打份工。外國老師因材施教係香港唔會發生，可以咁講，個種程度唔同。香港老師都會認為自己會因材施教，但變幅可能係10%，外國嘅係50%係香港唔會發生。點因材施教都好，功課唔會改，考試亦都會照考。 咁同香港嘅學院研究下啲野可唔可行呢？ 無話唔可行嘅，六合彩都有人中啦。但我嘅真實睇法係呢個機會好渺茫。原因係咁：唔愛好和平嘅老師通常唔識做人，科研要有長久而穩定嘅人際關係，佢地唔會俾到你。無包容嘅學院你亦都唔洗哂時間去遊說，因為佢地個氣氛唔係做科研，佢地係打工。加上無包容度嘅老師無可能同你一齊研究一樣野好耐，因為科研要經歷失敗，佢地一經歷失敗就會發癲。你唔好同按本子辦事嘅老師講推廣科技，教書只係一份工作，除非好快可以幫到佢升職，否則你都係唔好哂時間。 其實掉返轉頭諗，如果香港嘅學院真係咁識得同人合作搞科研，全世界一早排隊黎揾佢地啦，洗等你咩。佢地一定係有一啲被全世界都唾棄嘅缺點，否則香港唔會係而家咁嘅局面。
We have built the 8 bits register
Teenager computer architecture free lessons