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。
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…
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Shatin IVE library has great books
Shatin IVE library has great electronics books, I think they have a long history in electronics.
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,…
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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。
Support debug using vscode for xv6-riscv
launch.json in “.vscode” folder tasks.json “.vscode” folder Remove “-O” in Makefile run: set some breakpoints in vscode make qemu-gdb click the “run” button in vscode, see below
Nand / Nor
i know any gate can convert to NAND or NOR, asked many time why people always use NAND instead of NOR, no one can answer, but i found the answer now. NAND need voltage, NOR need current.
香港搞open source搞唔起的原因
香港永遠唔會出到外國咁成功同大型的open source project, 原因如下: 原因一: 香港無錢 香港人最驚被人話無錢, 但係開源呢單野上正正就係無錢, 可以話係窮到一蚊都無嗰種. 唔信你可以申請下創新科技署同科學園, 你話你搞open source睇下批唔批到條毛俾你. 原因二: 香港人無堅持力同投入度 你可能會反駁香港人都搞好多open source project, 但係得罪講句啲project係停留係小工具嘅層面(我唔係串, 我只係講事實), 係級數同規模上無得同外國比. 至於點解呢世做小工具, 原因不外乎香港人堅持同投入度都極度低下, 無人可以做一單野用十年做單位. 原因三: 香港人好鐘意得個噏字 香港真係太多阿叔, 可以睇 創科阿叔心理分析 原因四: 香港人啲技術低 HK developer = App developer, 個底係打工仔一名, 啲咩科學改變世界唔會關佢地事, 佢地只關心轉工. 原因五: 香港學界無力 香港嘅學界基本上一蚊都揾唔到sponsor, 如果你揾啲教授合作, 佢地唔係自己着數哂就唔會做, 一係就係咁得個吹字. 講技術, 香港學界有幾多料大家都知, 出論文可能得, 但要開發啲實際野唔洗諗. 原因六: 香港無一群有科學使命嘅老細 所有老細為賺錢, 佢地可能都係讀科學出身, 但個底唔係科學人, 可以話一啲科學精神都無. 佢地搞野要三個月後攞出去賣,…
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Heltec Arduino super simple tutorial
Buy from here. Offical website. Steps to make it work in arduino: 3. Burn these examples To try the wifi example 2. Change the wifi ID and password, case sensitive 3. Run it and see the result in serial monitor, set the baudrate to 115200. It grab the html from outside, see the code then…
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Arduino Nano V3.0 + NRF24L01
This little board is nearly the same size as nano but embedded with a NRF24L01, and also very cheap $4 USD. To make it works: The “RF24 > Scanner” will works like below 100% compatible with Arduino nano
Programming Arduino using STK500 ISP
STK500 is better than MKII since it supports high voltage programming, it can reset fuses from any status. Step 1: Install the driver. Must be version from date 7th Oct Plug in the USB, if it detected wrong driver, update it by select specific folder’. Need reboot the computer to take effect. Step 2: connect…
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Programming Arduino using MKII ISP
I got MKII ISP from here. To program Arduino Nano via Microchip studio, nothing special, remember have to select the chip. And Nano D8 pin is B0. Nano bootloader can be found in here.
STM32 + OLED 0.96 4pins I2C, works
This video works https://www.youtube.com/watch?v=Mt6U30Yxrr8&t=311s , sample code is in here.
Arduino Nano IIS + Oled
this youtube works. Oled 0.91 and 0.96 inch both work. Oled can buy in here. The adafruit example is 128×32, need to change to 128×64 for 0.96 inch oled. One thing becareful, 0.96 oled 128×64, the address is still 0x3c, not 0x3d In Arduino IDE, change the address to “3C”, otherwise won’t work
Teaching teenagers to understand logic
Teaching always sharpen my knowledge, fill up all the missing gap of my skill
