Using SSD1306 with external RAM

olikraus · October 11, 2017, 3:13pm

One problem, this lib seems to be taking up a lot of Flash memory now. Any solutions?

I have an FAQ entry for this:

olikraus/u8g2/blob/master/doc/faq.txt#L167


      
          will use the hardware subsystem on your uC. For an Arduino board, HW_I2C will
          call the Wire library for hardware accelerated I2C communication. "HW"
          constructors are much faster, but maybe debugging and setup is more 
          easier with a "SW" constructor.
          
          Q: Why does the hardware I2C accept clock and data pins?
          The hardware I2C constructor looks like this:
          U8G2_<display>_HW_I2C(rotation, [reset [, clock, data]])
          This means there are three options to use this constructor:
          1. U8G2_<display>_HW_I2C(rotation)
          2. U8G2_<display>_HW_I2C(rotation, reset)
          3. U8G2_<display>_HW_I2C(rotation, reset, clock, data)
          Hardware I2C usually is possible only with fixed pins. This means, the first or 
          second form of the constructor must be used. As of today only the ESP8266 
          support pin remapping. In such a case, also the third form can be used.
          
          Q: How to activate 16 Bit mode?
          A: Search for the line
          //#define U8G2_16BIT
          in "u8g2.h". Uncomment this line:
          #define U8G2_16BIT

For more specific comments, please post your code.

Oliver

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Using SSD1306 with external RAM

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