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OLED interface with Rotary encoder

AAbed.1
Associate III

Hi ;

I have worked with STM32F429i to generate square signal with various frequency. The value of frequency can be shown on OLED SSD1306. I configured I2C1 to connect with this display.

When I connect just Rotary encoder, i can see the change of frequency on oscilloscope, but when I connect OLED , I can get numbers on it. Unfortunately, I can not see the change of frequency when change the position of encoder shaft.

is there any advice to work simultaneously.

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