Here is a list of all files with brief descriptions:

liboledc.c
oledc_.h
oledc_begin.c
oledc_bitmap.c
oledc_clear.c
oledc_color565.c
oledc_copy.c
oledc_drawCharLarge.c
oledc_drawCharMedium.c
oledc_drawCharSmall.c
oledc_drawCircle.c
oledc_drawCircleHelper.c
oledc_drawFastLines.c
oledc_drawLine.c
oledc_drawPixel.c
oledc_drawRect.c
oledc_drawRoundRect.c
oledc_drawTriangle.c
oledc_fillCircle.c
oledc_fillCircleHelper.c
oledc_fillRect.c
oledc_fillRoundRect.c
oledc_fillTriangle.c
oledc_fontLargeBubble.c
oledc_fontLargeBubble.h
oledc_fontLargeSans.h
oledc_fontLargeScript.h
oledc_fontLargeSerif.h
oledc_fontMediumBubble.h
oledc_fontMediumSans.h
oledc_fontMediumScript.h
oledc_fontMediumSerif.h
oledc_getCursor.c
oledc_getScreenInfo.c
oledc_goTo.c
oledc_init.c
oledc_invertDisplay.c
oledc_print.c
oledc_scrollStart.c
oledc_scrollStop.c
oledc_setCursor.c
oledc_setRotation.c
oledc_setText.c
oledc_spiWrite.c
oledc_write.c