- #Serial eeprom programmer pdf
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When programming the AVR in Serial mode, the In-System Programmer supplies data to the target on the MOSI pin. Immediately after the Reset goes active, this pin will be driven to zero by the programmer. This pin is always driven by the programmer, and the target system should never attempt to drive this wire when target reset is active.
When programming the AVR or other SPI chips in Serial mode, the In-System Programmer supplies clock information on the SCK pin. To simplify this operation, the target reset is controlled by the In-System Programmer. When erasing the chip, the reset line has to be toggled to end the erase cycle. The target AVR microcontroller will enter Serial Programming mode only when its reset line is active (low). This is done by connecting ground of the target to ground of the programmer. The in-system programmer and target system need to operate with the same reference voltage.
#Serial eeprom programmer software
Verify functions from the software screen.Īccording to the device information box from the software, signal connections should comply with the table below.įollowing is an example pinout of SPI EEPROM:
#Serial eeprom programmer pdf
#Serial eeprom programmer driver
Until I have found the second one, I also used a kernel module which adds /dev/i2c-x interface driver and wrote a script for writing eeproms here:Įnjoy whichever method you like. One which does pretend to support eeproms smaller than 128kb ( this one ) and one which really does ( this one ). There are two forks of ch341eeprom on github.
#Serial eeprom programmer download
After setting the length manually, I was able to download complete data from my flash.Īfter some time I also needed to use it for 24C… programming. So I forked the original github repo and added an option to manually set memory length. Unfortunately, when I tried to read memory contents I was only able to get first few bytes of my memory, probably because the chip was detected incorrectly. After compiling and connecting my chip, I was able to read info about my flash. The second one is for 25Q… SPI flash chips so it was my choice. The first one can be used for programming 24C… I2C EEPROMs. You can easily find the original utility & driver for Windows on the Internet but the chip manufacturer doesn’t provide software for Linux.Īfter examining the board I found out that the chip is CH341A ( datasheet) so I googled for some Linux software and I’ve found 2 opensource drivers: So I have ordered this cheap USB serial EEPROM programmer on ebay. I n eeded to backup original firmware of my favorite Chinese wireless router but I didn’t want to spend much time with hacking the embedded Linux.