Monthly Archives: December 2023

Screen: MPRO firmware hotfix 3

Recently some MPRO samples had reported random disconnect sometimes or can not detect at all.

After some investigation and testing, it is confirmed that it is not a software issue, but two possible problems, which are highly related to USB cables and PC USB voltage leak. The first problem is normally caused by the USB cable not matching the 90-ohm impedance standard, so the USB data quality is very poor, resulting in instability for long cables. The second problem is that some PC power supplies are not well shielded, and for long USB cables used for simracing, they act like antennas, receiving much more noise than the short cables inside the PC, causing the screen to not work normally or even worse, breaking the screen.

´╗┐In the market, it is difficult to find high-quality USB cables. Therefore, for future MPRO samples, we will consider providing a suitable USB cable with better performance and reliability.

One more thing, MPro version currently do not support USB-TYPEC <=> USB-TYPEC cables, only support USB-TYPEA <=> USB-TYPEC cable or USB-TYPEA <=> microUSB + USB-TYPEC adaptor, later we will consider support USB-TYPEC <=> USB-TYPEC.

Screen: MPRO firmware hotfix 2

The new firmware fixed touch screen sometimes blocks display normal operate, also some small issues, add version information to firmware.

Download link is same: https://vonger.cn/misc/temp/mpro_upgrade.zip

Screen: Drive LEDs with MCU Part1

This is the working demo board, CH32V003 connect to V7B or MPRO driver board I2C interface. This way can save one USBHUB and ATMEGA, only need a very low cost CH32V003(0.1USD)

Source code upload to github.com/vonger/V7B_WS2812B

MPRO and V7B I2C CLK/DAT are in different position, so need a switcher to compatible them.

We also make some demo boards, if you need them contact support(a)vocore.io