Unofficial Nextion/TJC User Forum

Mapping out connector J2 on Basic

#1

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

image

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
GND RESET SWCLK SWDIO 3.3V