This program implements the SSD1351 OLED using SPI. It uses the Adafruit graphics library to perform the following task on the OLED:
Print the full character set found in the font table in glcdfont.c.
Print the string “Hello world!” to the display
Display a pattern of 8 bands of different colorshorizontally across the full OLED display.
Display a pattern of 8 bands of different colors vertically across the full OLED display.
Call the testlines() function to display diagonal lines.
Call the testfastlines() function to display a rectangular grid pattern.
Call the testdrawrects() function to draw a pattern of rectangles.
Call the testfillrects() function.
Call the testfillcircles() and testdrawcircles() functions.
Call the testroundrects() function.
Call the testtriangles() function.