57 lines
2.7 KiB
Plaintext
57 lines
2.7 KiB
Plaintext
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Q: Why does my xxx_SW_I2C() device not work with my other I2C devices
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A: SW_I2C emulates I2C with digitalWrite(), which will have a conflict with other
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I2C devices at the same pins. There are two options: (A) use xxx_HW_I2C() or
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(B) use different pins with xxx_SW_I2C()
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Q: The pin names on my display do not fit to the pin names of U8g2.
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A: Yes, each datasheet/product/controller has different names. There
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is a mapping table on the wiki for this:
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https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#wiring
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Q: My controller/interface combination is not listed in the examples.
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A: Yes, the complete list is here:
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https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
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Q: There is an x-offset on my SSD1306 128x64 OLED.
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A: This is not a SSD1306 OLED, instead use the SH1106 constructor.
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Q: A T6963 misses columns on the display/has garbled output.
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A: Ensure that the T6963 operates in 8x8 mode:
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If the display module has two font select (FSx) pins, connect both to GND
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If the display module has one font select (FS) pin, connect it to GND
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Q: My display controller is listed, but the display dimension is not supported.
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A: Raise an issue in the u8g2 tracker "https://github.com/olikraus/u8g2/issues"
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Q: My controller is not listed, What can I do?
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A: First check whether this controller is compatible to one of the supported
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controller:
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Supported: ST7565, Compatible: NT7534, UC1701, SED1565, S1D15605, S6B0723
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Supported: SED1330, Compatible: SED1335, RA8835, S1D3305
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Supported: LC7981, Compatible: NT7086, (maybe also: HD61830)
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This table just reflects my current knowledge. It is not tested and my not be true at all.
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If your controller for a monochrome display is not listed,
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you could raise an issue in the u8g2 issue tracker.
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A more detailed discussion of some controllers is listed in "controller_cmds.txt"
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Q: What is wrong with connecting Reset (RES) of my display with the Reset of my
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Arduino Board?
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A:
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- Both are inputs. It does not make sense to connect two inputs
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- Both pins have completly different functions: The reset of your input will reset
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the Arduino board, the reset of the display will reset the display.
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Please connect the reset input of the display with a normal GPIO pin of your board.
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Q: Shell I connect CS (chip select) with the SS output of the Arduino board?
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AIn general this is required neither for hardware or software SPI.
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Q: My board has a MOSI and a SCK output. Do i need to connect this to the
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clock and data pins of my display?
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A: "Yes" if you want to use hardware SPI (u8g2 constructors ending in _HW_SPI).
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You can use any pins with the software emulated SPI of u8g2 (constructors ending
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in _SW_SPI). Howver in general it is better to use hardware SPI to get a better
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performance of your display.
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