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Nextion LCD with Maple Mini Clone (STM32F103CBT6)

Posted: Tue Aug 08, 2017 12:08 pm
by befiglonia

I'm on OSX, working on platformio with Roger's STM32duino core.

I have e Nextion LCD (5V) that works great on a Blue Pill board on its 5V-tolerant RX/TX pins (with common ground).

I want to adapt it to my Maple Mini Clone, but fail to get it running properly.
I tried all USART interfaces, and also checked them for their reliability.

In debugSerial i get following lines:

recvRetCommandFinished ok
recvRetCommandFinished ok
recvRetCommandFinished err
recvRetCommandFinished err

During display initialisation I can get a command working during the first few seconds. After that display/board does not respond (after first err message).

BAUD for Display is on 115200
BAUD for debug is 9600

It may be the 3.3V/5V logic, weird thing is however that Bluepill is working properly and on Maple mini some commands work during the first few seconds.

I would be very thankful for some hint in the right direction.,,