https://wiki.st.com/stm32mcu/wiki/Getting_started_with_DMA#DMA_memory-to-memory_example_overview 2025/07/15

Special Thanks to Mr kdschlosser for writing the driver Example: More Examples on https://github.com/quantrpeter/Waveshare-ESP32-C6-1.47-Touch-Micropython-LVGL 2025/07/06

2025/07/06

My old Ender 3 Pro, give 0.3mm X-Y Hole compensation, now no need polishing, I can plug them into another. Two filament print from two different nozzle temperature, same perfect. 2025/07/04

https://gitlab.quantr.hk/example/micropython/waveshare-c6-zero-st7735 2025/07/03

https://www.waveshare.com/wiki/ESP32-C6-Zero 2025/07/03

Example: Clock Cheap Yellow Display Pins Connector types Connector Type Note P1 4P 1.25mm JST Serial P3 4P 1.25mm JST GPIO P4 2P 1.25mm JST Speaker CN1 4P 1.25mm JST GPIO (I2C) What pins are available on the CYD? There are 3 easily accessible GPIO pins Pin Location Note IO35 P3 JST connector Input only pin, […] 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

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

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

2025/04/01

Mac command to read from UART 2025/02/24

run this command 2025/02/07

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

2025/02/02

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

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

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

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

To enable debug, "CFLAGS=-g ./configure" won't work, edit ./isa/Makefile and add -g to variable RISCV_GCC_OPTS then it works. The dump file won't show debug info, run "riscv64-unknown-elf-objdump -DS rv64ui-v-addi" then you see it 2024/11/17

2024/09/28

https://github.com/WeActStudio/LogicAnalyzerV1 2024/08/27

2024/07/08

如果想知道容器嘅原理，我圈起左 2024/07/01

2024/04/14

http://blog.k3170makan.com/2018/10/introduction-to-elf-format-part-vi.html 2024/04/13

When i change kernelvec.S to -ggdb, my dwarf library broken but now fixed. Commit :e640c3d9 And I still don't understand why .S won't be an compile unit in dwarf, why design like that. 2024/04/09

2024/04/07

I need a super clean apache and forward all PHP requests to a independent php-cgi process which host by a specific port 1. Install Apache Mac In ubuntu, no need to build apache from source, just "sudo apt-get install apache2" Linux 2. Install PHP Mac Linux if you meet this error "configure: error: re2c 1.0.3 […] 2024/03/30

Hi, if want to to provide other function-calls to TCG plugin, such as reading guest memory, follow these steps: https://peter.quantr.hk/2024/01/qemu-risc-v-log-all-memory-operations/ 5. Run in qemu 6. Edit xv6-riscv Makefile: References: 2024/02/10

Step 1: Step 2: modify ./tests/tcg/plugins/mem.c , add this code in vcpu_mem() Step 3: in xv6-riscv change this to Then you see this References 2024/01/27

I was trying to find the body of trace_memory_region_ops_write function in qemu source code, can't find it. It is generated by python script (log.py) 2024/01/17

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: 2023/12/27

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 […] 2023/12/24

i finally found the differences between NOR and NAND flash, but just dont know what is it 2023/12/22