LCD how to draw a circle

  • I am using Kendryte standalone SDK,

    1. how do I draw a circle?

    2. The draw rectangle code (in the lcd.c) is performing several writes to construct a rectangle, i.e each side is written separately

    If I want to create a rectangle in a single writer operation is it possible?

    Is there a way of creating the whole image in some kind of buffer and send it out as a single SPI send operation