libch340

read/write to ch340 device without tty driver

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why?

You bought an off brand arduino and realize that it comes with a ch340 instead of ftdi. Can't find arm64 binary for tty driver? Use lib-ch340 to easily read/write to your microcontroller from any linux host.

development

make build # locally builds static and dynamic target

TARGET=amd64 make build-docker # builds x86 targets in docker

TARGET=arm64 make build-docker # builds arm64 targets in docker

TARGET=[amd64|arm64] make sync # copies build to local fs

test

Run lsusb to find vendor and product id for ch340 device. Look for description such as:

Bus 003 Device 072: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapte

Run test script with vendor and prouct:

./build/tests/test_ch340 1a86 7523

remove sudo requirement

Replace vendor and product id from lsusb query.

echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666"' | \
sudo tee /etc/udev/rules.d/99-usb-serial.rules > /dev/null && \
sudo udevadm control --reload-rules && sudo udevadm trigger

Reconnect the device to trigger rule.