
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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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.

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

ATMega 328p use ext 16M oscilator
https://www.ee-diary.com/2021/06/how-to-program-atmega328p-using-atmel.html

Step to run icesugar-nano
Bought from here. user manual: https://github.com/wuxx/icesugar-nano/blob/main/README.mdwin 7 serial driver: https://github.com/wuxx/icesugar-nano/blob/main/doc/usbser.infsource and semantics: https://github.com/wuxx/icesugar-nano Follow https://projectf.io/posts/building-ice40-fpga-toolchain/ . If you got this error: fatal error: ‘ftdi.h’ file not found, then modify config.mk in /Users/peter/workspace/icestorm: Edit /Users/peter/workspace/icestorm/iceprog/Makefile All examples in https://github.com/wuxx/icesugar-nano , just drag the demo program from demo folder or build it…
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ESP32 on arduino, simplest tutorial
Got this board from Taobao. Follow https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions. schematic:https://pan.baidu.com/s/1sNCK3Z4ZXfziKoF-ZYDMiw Code:pxc4doc:https://pan.baidu.com/s/1SJFlgyIenaM4-TfmT1eLtQ Code:NICE or download here If you failed to run the code for this. Hold “Boot” button while uploading the code If you meet “the port doesn’t exist”, do:

Create a dummy driver for openocd
We are developing our own risc-v so we need to have to ability to modify openocd. Here is the quickest guide for you to start when you type “set $s1=0xaabb”, it will jump to here

Very small STM32 board
Buy from here https://item.taobao.com/item.htm?spm=a1z09.2.0.0.67002e8deFDqTo&id=630403001847&_u=bbuhab0778e , model is STM32F103C8T6

Basic tutorial for blinking led for STM32F411
Tutorial: Create the project Step 1: Open STM32IDE, create the project, choose the right MCU Step 2: Type in project name Step 3: This is project structure Step 4: LED is assign to PC13, set it to GPIO output Then it will generate the setup code Step 5: Blink the led in main, there is…
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SEMU call graph
This graph generated by graphviz, helping students easier understand Professor Jim Huang’s SEMU RISC-V emulator


Export our data structure into logisim
Created the library to export our data structure into logisim, https://gitlab.com/quantr/eda/logisim-library , part of our EDA tool

Good HDL synthesis book
The first step of logic synthesis is call “HDL synthesis”, converting verilog into raw netlist. http://ebook.pldworld.com/_eBook/FPGA%EF%BC%8FHDL/-Eng-/Verilog%20HDL%20Synthesis.%20A%20Practical%20Primet%20%28Bhasker%29.pdf