[chbot] Help with a B4A serial over USB project

[Charles Manning]

Also this:
https://www.b4x.com/android/forum/threads/read-usb-rs232-buffer.146994/
That's reading, but likely writing is similar.

On Fri, May 9, 2025 at 9:16 AM Charles Manning <cdhmanning at gmail.com> wrote:

> Hi Mark
>
> I do not have any B4A skills, but this might help you find the right
> direction:
>
>
> https://www.b4x.com/android/forum/threads/usbserial-with-multiple-unknown-vid-pid.121048/
>
>
> On Fri, May 9, 2025 at 8:13 AM Mark Atherton <markaren1 at xtra.co.nz> wrote:
>
>> Hi All,
>>
>> Just wondering if someone with B4A skills could help me with some demo
>> code.
>>
>> I need a very simple and complete B4A project that will run on an
>> Android tablet with OTG and connect to a CH340 USB/serial bridge.
>>
>> The app needs a button that will send 'L' to the CH340 when pressed. It
>> would also be useful to have a small area which displays incoming
>> characters from the CH340. Port is configured at 57.6k, N, 8, 1.
>>
>> Overall project is educational/non-commercial, and will become
>> open-source in due course with appropriate credits.
>>
>> Many thanks,
>>
>> Mark
>>
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