README: show a more complete GS8 fb exmaple.

README.md

@@ -40,8 +40,7 @@ Mirroring can be enabled in both x and y axis with the `mirror_x` and `mirror_y`
 
 To test the driver quickly, do:
 
-    mpremote cp uc8151.py :
-    mpremote run demo_no_flick.py
+    mpremote run uc8151.py
 
 The demo code has pins configured for the Badger 2040.
 
@@ -104,6 +103,21 @@ It is possible to display regular GS8 framebuffers, too.
     # Then draw the framebuffer on the screen:
     eink.update_greyscale(fb,32)
 
+This is a complete example using MicroPython Framebuffer, filling the screen with squares of different sizes.
+
+```python
+gs8buf = bytearray(128*296)
+gsfb = framebuf.FrameBuffer(gs8buf,128,296,framebuf.GS8)
+square_id = 0
+for x in range(0,128,128//4):
+    for y in range(0,296,296//8):
+        color = int((255/31)*square_id)
+        gsfb.fill_rect(x,y,128//4,296//8,color)
+        square_id += 1
+
+eink.update_greyscale(gs8buf,32)
+```
+
 # What I learned about setting waveforms/LUTs for EDPs
 
 The world of e-paper displays is one of the most undocumented you can find: this is the unfortunate side effects of patented technologies, as there is a strong incentive to avoid disclosing useful information, with the effect of slowing down software progresses towards programming these kind of displays. The only source of information I was able to find: