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Are you pretty sure, that logic input is 5V?

I'am a little worried about input level Tx/Rx communication, because unmodified gd32.. work on 3.3V. There is also stabilizer to 3.3V.

I'm using all the time logic directly from Arduino 5V, but maybe it's better to use 3.3V?


when you talk about Nextion Displays, have a look to their datasheets like ...

https://www.itead.cc/wiki/NX4024K032

especially the section "Interfaces Performance"

 

In the "Interfaces Performance" chart in that datasheet, the "High Input Voltage" line with a Max of 5.0V seems to imply that the inputs are 5-volt tolerant, but the "Extended I/O" comments don't specifically say that.

image


I personally have no relevant experience..

Mav only asked for the communication pins ... and the RX accept a max. of 5V ...


the GD32F103 is an ARM M3 core MCU ... same as the STM32F103 ...


not all of its Pins are 5V tolerant, but most ... and for the used 8 I/O's Itead indeed used 5V tolerant ones ...


attached the GD datasheet, page 18-25 shows the Pin characteristicas ...


To make things "saver" on your side, you also can put a small protective resistor in series, 330R should work very well ... no must, but also no harm ... but a little more save ...

pdf

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