2025/07/02

2025/07/02

Step 1: create Dockerfile Step 2: Build the image docker build -t xclock-ubuntu . Step 3: Set XQuartz and restart it Step 4: Run "xhost + 127.0.0.1", and this "xhost +localhost" wont work Step 5: Run Another way 2025/07/01

Step 1 2025/06/29

Official Tutorial From TaoBao Factory : https://github.com/quantrpeter/2.8inch_ESP32-2432S028R Remark: use offset 0x1000 to write the firmware and have to erase flash first, so: Download micropython firmware here https://micropython.org/download/ESP32_GENERIC/ 1. esptool.py erase_flash2. esptool.py --baud 460800 write_flash 0x1000 ESP32_GENERIC-20250415-v1.25.0.bin Download All Files in below links, or by the attachment in this posts ILI9341 Display Driver Download ili9341.py from: […] 2025/06/29

In mac, sometime arduino unable to write the program to cheap yellow display esp32, you can type the command manually 2025/06/29

2025/06/29

2025/06/23

If you have this problem: run: sigrok-cli --loglevel 5 -d fx2lafw --scan , it said failed to find the firmware file So build this project and restart terminal, then you will success 2025/06/19

2025/06/18

It has no SoftI2C, so change display = ssd1306.SSD1306_I2C(128, 64, SoftI2C(sda=Pin(20), scl=Pin(21))) to import timefrom machine import Pin, I2C, SoftI2Cimport ssd1306 i2c = I2C(1) # Create I2C object display = ssd1306.SSD1306_I2C(128, 64, i2c) # Pass I2C object display.fill(0)display.text("Hello, World", 0, 0)display.show() time.sleep(100) 2025/06/07

using st-flash is better then dfu-util because we don't need to put the board into dfu mode 2025/06/07

https://gitlab.quantr.hk/quantr/toolchain/java-at28-programmer https://gitlab.quantr.hk/example/arduino/at28-programmer 2025/06/06

IT IS SSH1106，NOT SSD1306 2025/06/04

https://item.taobao.com/item.htm?_u=vbuhab0c8fc&id=692235616325&pisk=gfaLsUj6M1dLBGaKsWSMEFEN3lfGiGVU_JPXrYDHVReTeSd3x0DoV4e4H0TlY2m-yRMg-vVnRbi7E-ZndkDkyzeapeYoR8b-FSrNavc3-Qh7fJLuxWD3XQ3USkYoK9u8N-0RntbcoWPE846cnxid94gjO3OBEYg614c8jWtHGWPEzYOMFiq_TQhdgwAINY1t5bhIO4MINF1twb9IPviWChGjC4gSA0t_1jcXApMWA1KstbcWRXGS5hGSZHgSP8N16bksO4gS9i5KQBGpyo2QH1YJL2LWPPhKfiViCiyQJXhnnWapBddr9DHbOAB4G69Z2JnLSwpq9lNYiXePueuI2kwK14QJ72VYfJnTvTLtblN4PcENHnP4OowSKP6XyYq4JomqAILY68UtRAUPaUkQx7ao2y6XZvaUKPn4zpBiEoVgRcefIFer2kwK1qsPZr4xT7vmHbxC61Ky4DGw7oIF1mRpfIltn6iB43oo_fHc6tty4DGZ6xfB_3-rqf5..&spm=a1z09.2.0.0.20712e8dhZRCRN (Set to 115200, otherwise upload will fail) 2025/05/31

諸葛亮勁係無資源嘅情況底下可以有高強嘅執行力。而香港人絕大部份都無執行力。 2025/05/13

https://gitlab.quantr.hk/example/stm32/stm32f411ceu6-74hc595-shift-register 2025/04/26

2025/04/25

This is the tutorial to compile micropython with LVGL and burn it into the board Steps: If success, you should see this Open thonny and run Then you will see Links you should read https://www.waveshare.com/wiki/ESP32-C6-LCD-1.47 https://github.com/lvgl-micropython/lvgl_micropython Remark: This program is a little bit crazy, first time you run it will success, but if you run […] 2025/04/14

2025/04/01

Mac command to read from UART 2025/02/24

I don't understand why US gov list Hong Kong as their enemy Download Unity international tutorial 2025/02/23

2025/02/22

If you are using macports instead of homebrew, you may have this problem. Solved by this: LDFLAGS="-L/opt/local/lib" CPPFLAGS="-I/opt/local/include" pyenv install 3.12.6 2025/02/16

run this command 2025/02/07

Edit CMakeLists.txt, add these two line on top 2025/02/07

2025/02/02

if you want to send one single byte this is not working writer.write(new Int32Array([0x4]).buffer); this work writer.write(new Uint8Array([0x4])); 2025/01/29

There are two mode in micropython: REPL vs paste mode. I guess the uart of my ESP32 board has no flow control, so you can't send all bytes at once, because it is too fast, so I sleep 100 ms for every 100 bytes. REPL mode You can't just send your python code, you need […] 2025/01/28

香港有人係咁，廿幾歲畢業出黎做野，做左幾年對隻language開始熟，佢地唔係鑽落去language下面睇下發生緊乜野，例如啲code點compile呀，debug點做呀咁。佢地會作一出個難以解釋嘅現象，就係跳去另一隻high level language到再玩過，而當佢地玩到興起玩左幾年，佢地再次唔係想知道隻language嘅底層，而係再一次又跳去其它high level language到碌多一次，難道唔想知揸係手裏面把刀係咩黎？我叫呢一種現象做「香港Python仔現象」。舉個例子，2003年班友玩vc++，跟住跳去c#，跟住又跳去java，而家又跳去python。因為咁樣跳法本質上對過去學嘅語言都唔方認識得深，所以如果而家有個阿叔好推崇python，對其它language只停留係誇誇其談攞唔出到戰鬥力，佢大概率係咁。 要改變，就要做好科普，揭露python底層所有野，咁先至有機會改變。但呢班友會唔會變未知。 2025/01/28

2025/01/10

When running the chisel book example, we got Error compiling the sbt component 'compiler-bridge_2.12'. Here are the way to solve it git clone https://github.com/schoeberl/chisel-examples.git Edit hello-world/build.sbt Edit hello-world/src/main/scala/Hello.scala 2025/01/09

香港人嘅老土活該沒有科技，我而家分析俾你地睇香港人嘅老土係有幾老土，以及老土嘅香港人點解覺得自己唔老土 第一老土 ： 你憑咩 佢地所謂嘅論證不外乎係黎自你所受嘅教育同埋經驗，佢地會話你又唔係哈佛MIT學咩野人搞之類嘅言論，但呢班無讀歷史嘅人唔知好多科學家都係自學為主。（見下圖） 香港人老土在永遠人地努力做，佢地就會問"你憑咩"，其實呢一句好無敵，因為當你做緊而又未做完嘅時間你的確無力反駁呢一句，由其是你係做緊一啲你自己都唔知做唔做到嘅野時，你更加無力反駁。但呢班友永遠唔明，科學嘅發現好多時就係意外發現，好多野唔做就唔唔知得唔得，而呢班咁嘅人最叻就係用呢句去質疑你，佢地嘅內心世界就係「嘩，你做呀，你有無諗過㗎」，跟住就會覺得自己好似好有經驗，好似真係以為自己曾經做過咁，知道你條路係唔通，其實個現實就係，呢班友根本無做過，而更深一層嘅就係，佢地連去嘗試嘅基本實力都無，佢地唔係連個for-loop都寫唔出就係技術只夠寫啲script仔，真係可憐。 第二老土 ： 話人畫餅 呢個世界唔係所有人都需要理想，而理想呢樣野個實現率必定為低。香港地當然多人畫餅，但係係唔係畫餅好容易分，得個噏字唔做咪就係畫餅囉，會做嘅又點會算係畫餅呢，但係呢班咁嘅人就最叻攻擊啲為理想而行動嘅人。佢地個底其實係數佬，內心世界非常現實，我估計佢地後生嘅時候都曾經有理想，但手料跟唔上人到中年完全無哂動手能力，思想上變得越黎越現實，腦裏面諗一百個可能性去否定執行嘅成功率，不停俾借口自己逃避執行以至完全喪失執行力，佢地係編程上嘅實力只能點評人地寫嘅program，而自己乜都寫唔到。 Ada係連電都未係好識運用嘅年代就話要令機器有計算能力，如果香港班友返去佢嗰個時代，呢班友就會話人畫餅。嗰個時代根本就係非常簡陋。當呢班友話人畫餅，佢地嘅內心有一種好充盈嘅感覺，佢地會覺得：「嘿嘿，我真係叻，無俾你利用到」。但係個現實係咩呢，就係呢班友手料根本連俾人利用嘅資格都無，同你講下理想只係發下噏瘋而矣，唔好諗得自己咁有料可以俾人利用。 第三老土：話做唔做或者揾借口唔繼續做 話做唔做嘅人主要會話你唔夠條件做，做緊又揾借口唔繼續做嘅人會話發現你原來唔夠料做，又或者話發現你身上有啲缺點而唔再同你合作做。總之無論係咩原因都好，結果就係唔做。我地睇返Ada Lovelace個Case，當佢話要做一部Thinking machine嘅時候，佢mentor Charles Babbage唔會因為佢太天馬行空而屈佢畫餅，想反地會動手一齊做。而Charles Babbage亦都唔會話Ada無足夠嘅錢同埋未讀過大學就話人無料而做做下唔做。 2025/01/07

https://conorfennell.github.io/scala-zen/articles/sbt.html 2024/12/31

MX512G : 低压单通道有刷直流电机驱动器, RMB $2MX1616S : 双路有刷直流马达驱动电路, RMB $7.8TRSP5040A : SOP8語音OTP芯片40秒碩呈語音播報IC程序開發, RMB 0.27RF2520A : 无线遥控收发器芯片, RMB $4.3 2024/12/28

第一步其實好簡單，就係視覺角度唔好錯，畫細畫detail，畫太大舊野無意思 2024/12/27

This tutorial give us a very good demo on rendering: https://www.youtube.com/watch?v=ukd1zO0Q-h4&t=317s 2024/12/25

2024/12/20

https://item.taobao.com/item.htm?_u=ibuhab0bb1b&id=628418040642&spm=a1z09.2.0.0.76e02e8dYbXP6k 2024/12/18

https://gitlab.com/peter-example/stm32/thei-stm32-demo-stm32f411ceu6 2024/12/18