Skip to content
Documents and Software Related to the famous CH341a used in I2C/SPI Flash Programmers also called as Bios Programmers
Branch: master
Clone or download
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
AVR-Programmer Initial commit of all data Jul 18, 2018
CH341-Android-SPI-I2C-Driver+SDK-lib+APK Initial commit of all data Jul 18, 2018
CH341-Android-Serial-Driver+SDK-lib+APK Initial commit of all data Jul 18, 2018
CH341-Download-Apps Adding new Chinese Datasheets + mac update + Download apps Feb 17, 2019
CH341-Evaluation-Kit-SDK Initial commit of all data Jul 18, 2018
CH341-Linux-SPI-I2C-Driver+SDK-library Initial commit of all data Jul 18, 2018
CH341-Linux-Serial-Driver+SDK-library Initial commit of all data Jul 18, 2018
CH341-MAC-Serial-Driver+SDK-library Adding new Chinese Datasheets + mac update + Download apps Feb 17, 2019
CH341-PCBs Initial commit of all data Jul 18, 2018
CH341-Windows-PRINTER-Driver+SDK-library Initial commit of all data Jul 18, 2018
CH341-Windows-SPI-I2C-Driver+SDK-library Initial commit of all data Jul 18, 2018
CH341-Windows-Serial-Driver+SDK-library Initial commit of all data Jul 18, 2018
Driver-OEM Initial commit of all data Jul 18, 2018
.gitignore
CH341A Mini Programmer Schematic and Drivers · One Transistor.pdf Initial commit of all data Jul 18, 2018
CH341DS1.PDF
CH341DS2.PDF
CH341_EN.pdf Initial commit of all data Jul 18, 2018
LICENSE
README.md
USB_SER.PDF
ch341a_miniprogrammer_schematic.png Initial commit of all data Jul 18, 2018
ch341a_pcb.jpg Initial commit of all data Jul 18, 2018

README.md

CH341-Store

Documents and Software Related to the famous CH341a used in I2C/SPI Flash Programmers also called as BIOS Programmers

Please note that this repository is a Coagulation of know-how from different sources.

CH341A Devices

Source : https://www.onetransistor.eu/2017/08/ch341a-mini-programmer-schematic.html

About CH341

This is versatile USB to multi-protocol converter chip.

There are 4 major items that become clear from the enclosed Datasheet(English)

  • UART - The chip can be used as a USB to UART converter. It can also be used for RS-485 since it has automatic driver control pin also available.
  • Synchronous Serial - I2C and SPI - The chip has 3 chip select pins and Multi-mode support for SPI protocol. Also the chip has dedicated I2C pins.
  • Parallel Interface - This interface can be used to talk to parallel memory Bus with all the required control signals
  • Printer Port - The device can emulate a EPP Parallel Port over USB to be able to connect to older printers .etc.

Attributions

CH341a based Programmer

The Main uses that this chip finds is programing SPI flash chips. These SPI flash chips are often used in the BIOS of many computer cards. In fact most of the WiFi routers use these SPI flash chips to store the embedded Linux image. So ideally these programmers can actually help you swap the Linux image on a WiFi Router. Also it has been reported that this programmer can be used to recover bricked or locked out BIOS from laptops.

Lets look at how the programmer looks like:

Typical CH341 based programmer

Source: https://www.onetransistor.eu/2017/08/ch341a-mini-programmer-schematic.html

Folks at Onetransistor have been kind enough to provide a schematics also:

Schematics of a CH341 based programmer

Source: https://www.onetransistor.eu/2017/08/ch341a-mini-programmer-schematic.html

PCB of a CH341 based programmer

Source: https://www.onetransistor.eu/2017/08/ch341a-mini-programmer-schematic.html

CH341a Drivers

We have downloaded the drivers from Jiangsu QinHeng Ltd Website hence all should be Genuine Drivers , malicious items free.

For Windows

For Linux

Most of the times you would not need any driver specifically since its auto registered. However to communicate you might need the help of libraries.

For Android Devices

It's interesting that the manufacturer actually provides support Android support. Not only that they provide the Android application to test and the Library in .jar form.

For MAC

There is not much support for MAC from the manufacturer.

CH341a Programmer Application

We still did not find any clean programmer application, that does not contain any viruses. Hence if any one can help us provide a clean programmer application - please let us know.

Here are few Open-source projects targeting this platform:

You can’t perform that action at this time.