We are going to have first big hardware upgrade for the driver board. Upgrade from version v7a to v7b and v10a to v10b. New features and changes: increase backlight brightness, from approx. 300lu to 400lu. fit new version 4.3inch screen and later possible new model 4inch screen. increase stable, solder protect diode directly on board. […]
Because current 4inch screen(based on driver board v10a) is designed for very low power usage and intend to be long life time, so we have to limit its backlight brightness to save power. But currently maybe people do not care about the power usage and backlight lifetime, so I write this blog to provide a […]
Recently some people report to us one problem. After they power on computer, VoCore Screen can not be found anymore, it become an Unknown Device. Currently the bad ones are on their way shipping back to us, but for now, I think I can guess what is the problem already. It is a very weird […]
From last year Sep.1, we meet global chip shortage. Recently some chips price increase to incredible level. My chip provider told me, currently STM32F103 price is around 72CNY/pcs(11USD/pcs) compare to early of last year only 3~5CNY. Another network chip IP101G, from 0.8~1CNY to 10CNY. 🙁 This is really crazy. PS: Lucky, I use Gigadevice MCU, […]
Develop on a chip like MT7628 is full of adventure…For new version of firmware I plan to use opensource MT76 driver instead of MT7628 driver. Weird thing is MT76 works well on some devices, but not well on some others, include VoCore2. I guess it is antenna issue, because for normal WIFI4 routers default has […]
Forget Keil, I love GCC. Makefile is enough for the ARM based chip GD32F150 🙂 Link to my source code:https://github.com/Vonger/gd32tools To get AD values from UART2. Here is the Makefile. Source code please use project/adc1. GD32F1x0_Firmware_Library_v3.1.0 this library is from GigaDevice. Download here: http://vonger.cn/misc/vocore2/GD32F1x0_Firmware_Library_v3.1.0.rar; For toolchain, please check http://vonger.cn/?p=14891, I have a link there. The […]
This blog will include two parts, first, make one VoCore2(name it host) into a JTAG compatible device, like JLINK; second, enable another one VoCore2(name it client) JTAG port, so we can use host JTAG connect to it and debug. OK, let’s start how to make it. JTAG Host Device OpenOCD only requires some GPIOs to […]
I wrote a simple tool to update vocore2 firmware or uboot through serial port, now upload to github. This tool might still have bugs…use carefully, I only tested it with VoCore2 uboot. 🙂 Usage is very simple: 1. use usb2ttl connect to your vocore2 uart2(TXD2/RXD2) 2. reboot vocore2 (or power up it), it will show […]
Currently VoCore2 do not have reset button, so some beginners are hard to reset the firmware once it is bricked by wrong setting… This new patch of uboot is used to solve that, it is much easier than upload firmware from serial port, but maybe still hard for beginner. If you want to have a […]
Currently USB screen are using two version of power supply chip, one is SY7200AABC, another is PT4103. I thought they should be same function and work in same way…but I am wrong. PT4103 backlight is not as bright as SY7200AABC. There is something wrong about PT4103…I set its current to 40mA, but the voltage on […]