This is 5V device without modification! It works for me(tm) but you have been warned
http://www.eevblog.com/forum/repair/ch341a-serial-memory-programmer-power-supply-fix/
Just lift pin 28 and put some tape under it to prevent any short circuit. Then solder one wire from this pin to pin 2 of AMS1117 and also to C4. The side of the C4 to connect is the one connected to CH341A pin 9.
CHM341A-3V3-fix.jpg
jumper on pins
1-2 SPI flash programmer mode
2-3 TTL serial mode
supported out-of-box by flashrom, probably better option, but anyway:
https://github.com/setarcos/ch341prog
dpavlin@nuc:/nuc/ch341a$ git clone https://github.com/setarcos/ch341prog Cloning into 'ch341prog'... remote: Counting objects: 104, done. remote: Total 104 (delta 0), reused 0 (delta 0), pack-reused 104 Receiving objects: 100% (104/104), 34.79 KiB | 0 bytes/s, done. Resolving deltas: 100% (61/61), done. Checking connectivity... done. dpavlin@nuc:/nuc/ch341a$ cd ch341prog/ dpavlin@nuc:/nuc/ch341a/ch341prog$ make gcc -std=gnu99 -Wall ch341a.c main.c -o ch341prog -lusb-1.0 dpavlin@nuc:/nuc/ch341a/ch341prog$ ./ch341prog Usage: -h, --help display this message -i, --info read the chip ID info -e, --erase erase the entire chip -l, --length <bytes> manually set length -w, --write <filename> write chip with data from filename -r, --read <filename> read chip and save data to filename -t, --turbo increase the i2c bus speed (-tt to use much faster speed) -d, --double double the spi bus speed
I2C in userspace
https://sourceforge.net/projects/ch341eepromtool/
dpavlin@nuc:/nuc/ch341a/ch341eepromtool_0.5$ gcc -o ch341eeprom ch341eeprom.c ch341funcs.c -lusb-1.0
dpavlin@nuc:/nuc/ch341a/ch341eepromtool_0.5$
dpavlin@nuc:/nuc/ch341a/ch341eepromtool_0.5$ ./ch341eeprom
ch341eeprom - an i2c EEPROM programming tool for the WCH CH341a IC
Version 0.5 copyright (c) 2011 asbokid <ballymunboy@gmail.com>
This program comes with asbolutely no warranty; This is free software,
and you are welcome to redistribute it under certain conditions:
GNU GPL v3 License: http://www.gnu.org/licenses/gpl.html
Usage:
-h, --help display this text
-v, --verbose verbose output
-d, --debug debug output
-s, --size size of EEPROM {24c32|24c64}
-e, --erase erase EEPROM (fill with 0xff)
-w, --write <filename> write EEPROM with image from filename
-r, --read <filename> read EEPROM and save image to filename
Example: ch341eeprom -v -s 24c64 -w bootrom.bin
flashrom SPI
Not needed anymore, included in mainline flashrom
git clone https://github.com/urjaman/flashrom/ git checkout -b origin/ch341a origin/ch341a dpavlin@nuc:/nuc/flashrom$ sudo apt-get install pciutils-dev
linux kernel spi module
dpavlin@nuc:/nuc$ git clone https://github.com/gschorcht/spi-ch341-usb.git Cloning into 'spi-ch341-usb'... remote: Counting objects: 63, done. remote: Total 63 (delta 0), reused 0 (delta 0), pack-reused 63 Unpacking objects: 100% (63/63), done. dpavlin@nuc:/nuc$ cd spi-ch341-usb dpavlin@nuc:/nuc/spi-ch341-usb$ make make -C /usr/src/linux-headers-4.14.0-3-amd64/ M=/nuc/spi-ch341-usb modules make[1]: Entering directory '/usr/src/linux-headers-4.14.0-3-amd64' CC [M] /nuc/spi-ch341-usb/spi-ch341-usb.o Building modules, stage 2. MODPOST 1 modules CC /nuc/spi-ch341-usb/spi-ch341-usb.mod.o LD [M] /nuc/spi-ch341-usb/spi-ch341-usb.ko make[1]: Leaving directory '/usr/src/linux-headers-4.14.0-3-amd64' dpavlin@nuc:/nuc/spi-ch341-usb$ dpavlin@nuc:/nuc/spi-ch341-usb$ sudo make install [sudo] password for dpavlin: dpavlin@nuc:/nuc/spi-ch341-usb$ sudo modprobe spi-ch341-usb [525021.048281] spi-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output cs0 SPI slave with cs=0 [525021.048285] spi-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output cs1 SPI slave with cs=1 [525021.048287] spi-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output cs2 SPI slave with cs=2 [525021.048290] spi-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio4 gpio=0 irq=0 (hwirq) [525021.048292] spi-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio5 gpio=1 irq=1 [525021.048296] spi-ch341-usb 2-2.1.4:1.0: ch341_spi_probe: SPI master connected to SPI bus 0 [525021.048426] spi-ch341-usb 2-2.1.4:1.0: ch341_spi_probe: SPI device /dev/spidev0.0 created [525021.048516] spi-ch341-usb 2-2.1.4:1.0: ch341_spi_probe: SPI device /dev/spidev0.1 created [525021.048596] spi-ch341-usb 2-2.1.4:1.0: ch341_spi_probe: SPI device /dev/spidev0.2 created [525021.049147] spi-ch341-usb 2-2.1.4:1.0: ch341_usb_probe: connected [525021.049194] usbcore: registered new interface driver spi-ch341-usb
linux kernel i2c module
root@nuc:/nuc# git clone https://github.com/gschorcht/i2c-ch341-usb.git Cloning into 'i2c-ch341-usb'... remote: Counting objects: 39, done. remote: Total 39 (delta 0), reused 0 (delta 0), pack-reused 39 Unpacking objects: 100% (39/39), done. root@nuc:/nuc# cd i2c-ch341-usb root@nuc:/nuc/i2c-ch341-usb# make make -C /usr/src/linux-headers-4.14.0-3-amd64/ M=/nuc/i2c-ch341-usb modules make[1]: Entering directory '/usr/src/linux-headers-4.14.0-3-amd64' CC [M] /nuc/i2c-ch341-usb/i2c-ch341-usb.o Building modules, stage 2. MODPOST 1 modules CC /nuc/i2c-ch341-usb/i2c-ch341-usb.mod.o LD [M] /nuc/i2c-ch341-usb/i2c-ch341-usb.ko make[1]: Leaving directory '/usr/src/linux-headers-4.14.0-3-amd64' root@nuc:/nuc/i2c-ch341-usb# root@nuc:/nuc/i2c-ch341-usb# sudo make install root@nuc:/nuc/i2c-ch341-usb# modprobe i2c-ch341-usb [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output gpio0 gpio=0 irq=0 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output gpio1 gpio=1 irq=1 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output gpio2 gpio=2 irq=2 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: output gpio3 gpio=3 irq=3 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio4 gpio=4 irq=4 (hwirq) [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio5 gpio=5 irq=5 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio6 gpio=6 irq=6 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_cfg_probe: input gpio7 gpio=7 irq=7 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_i2c_probe: created i2c device /dev/i2c-8 [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_i2c_set_speed: Change i2c bus speed to 100 kbps [Wed Feb 7 16:37:00 2018] i2c-ch341-usb 2-2.1.4:1.0: ch341_usb_probe: connected [Wed Feb 7 16:37:00 2018] usbcore: registered new interface driver i2c-ch341-usb
schematics and info
- http://onetransistor.blogspot.hr/2017/08/ch341a-mini-programmer-schematic.html
- http://www.zoobab.com/ch341-usb-spi-i2c-uart-isp-dongle
I added soic 8 pinout over zif socket, because position of pin 1 is not obvious (or clearly marked anywhere on top). I suggest that you fix that with silver sharpy.
alternative schematics
https://github.com/Upcycle-Electronics/CH341A-Pro
ch341Apro_schematicV01.pdf