[u8x8.setContrast] does not work

Projects Programming
1

Reference link 1: How to set contrast on a 128x128 px (ssd1327) oled display
Reference link 2: SSD1306 u8x8.setContrast(0-255) aint working · Issue #686 · olikraus/u8g2 · GitHub
Reference link 3: How to fade in or fade out oled display SSD1306 Adafruit library - #2 by Antrix

MCU : STM32Duino STM32F103C8

U8X8_SSD1306_128X32_UNIVISION_SW_I2C u8x8
[u8x8.setContrast] does not work.

hello.
Other operations work fine using the 'u8x8' library.
I want to use it with low power.

Software case(1)
u8x8.setContrast(0);

Software case(2)

  u8x8_cad_StartTransfer(u8x8.GetU8x8());
  u8x8_cad_SendCmd( u8x8.GetU8x8(), 0xD9);
  u8x8_cad_SendArg( u8x8.GetU8x8(), 0);  
  u8x8_cad_EndTransfer(u8x8.GetU8x8());

@olikraus
@marcelop
@sblantipodi
@MK1888
@summ
@Antrix

I use the command above, but 0 and 255 make no difference.

  1. Is there a software solution?
  • does not work.
  1. In terms of hardware, I replaced 'R5' in the picture with a resistor as large as possible.
    ex) R5 = 3M

Neither 1 nor 2 affect brightness.
help me.

2

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