Unofficial Nextion/TJC User Forum

Mapping out connector J2 on Basic

On each TJC/Nextion basic panel is a set of 5 pads labeled J2. Nextion has always been cagey about these pads and tend to delete any posts mentioning them (it’s something of a theme with them). Here’s what they look like:

For reference, here’s the STM32


These pads are used to flash the STM32 processor via Serial Wire Debug

Tracing the paths, here’s what we can see:

1 2 3 4 5

I was just wondering where those went and if they could be used. I guess they can’t. thanks for sharing it!

1 Like

Well they can be used, for STM32 SWD. Probably not useful in your projects, but it is very helpful if you’re digging into how the Nextion works behind the scenes.

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