ch341eeprom

A libusb based programming tool for 24Cxx serial EEPROMs using the WinChipHead CH341A IC

This fork adds the ability to specify the value of the part of the I2C address set by the chip select pins using the --chip-select argument.

Requirements

• clang, llvm, and make (via Xcode or Xcode Command Line Tools)
• libusb (perhaps via Homebrew: brew install libusb)

Compiling

After installing the necessary tools and libusb, building ch341eeprom is as simple as running the included Makefile:

make

Usage

Using ch341eeprom is straightforward:

Usage:
 -h, --help                  display this text
 -v, --verbose               verbose output
 -d, --debug                 debug output
 -s, --size                  size of EEPROM {24c01|24c02|24c04|24c08|24c16|24c32|24c64|24c128|24c256|24c512|24c1024}
 -e, --erase                 erase EEPROM (fill with 0xff)
 -p, --speed                 i2c speed (low|fast|high) if different than standard which is default
 -c, --chip-select <value>   the part of the i2c address set by the chip select pins (default: 0)
 -w, --write  <filename>     write EEPROM with image from filename
 -r, --read   <filename>     read EEPROM and save image to filename
 -V, --verify <filename>     verify EEPROM contents against image in filename

For example:

$ ./ch341eeprom -v -s 24c64 -e

Searching USB buses for WCH CH341a i2c EEPROM programmer [1a86:5512]
Found [1a86:5512] as device [7] on USB bus [2]
Opened device [1a86:5512]
Claimed device interface [0]
Device reported its revision [3.03]
Configured USB device
Set i2c bus speed to [100kHz]
Erased [8192] bytes of [24c64] EEPROM
Closed USB device

Author

Originally written by asbokid and released under the terms of the GNU GPL, version 3, or later. Modifications by command-tab to make it work under OS X.

License

This is free software: you can redistribute it and/or modify it under the terms of the latest GNU General Public License as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Tested

Name	Write	Read
CAT24M01WI	OK	OK
AT24C256	OK	OK
Microchip 24LC256	OK	OK
AT24C32N	OK	OK
AT24C08	OK	OK