epaper2in13v2: examples: add test for partial update mode

Signed-off-by: Pierre-Yves Kerbrat <pykerbrat@gmail.com>

examples/2in13v2-hello-world/partial.py

@@ -0,0 +1,51 @@
+import epaper2in13v2
+from machine import Pin, SPI
+from time import sleep_ms
+
+sck=Pin(14)
+miso=Pin(12)
+mosi=Pin(13)
+cs=Pin(15)
+hsspi = SPI(1, baudrate=4000000, polarity=0, phase=0)
+dc = Pin(2)
+rst = Pin(4)
+busy = Pin(10)
+
+e = epaper2in13v2.EPD(hsspi, cs, dc, rst, busy)
+e.init()
+
+h = 250
+w = 128 # actually it is 122 but better to be a multiple of 8
+x = 0
+y = 0
+
+# --------------------
+e.clear_display(0xff)
+
+import framebuf
+buf = bytearray(w * h // 8)
+fb = framebuf.FrameBuffer(buf, w, h, framebuf.MONO_HLSB)
+black = 0
+white = 1
+fb.fill(white)
+fb.fill_rect(2, 2, 118, 98, black)
+fb.text('Hello World',16, 60, white)
+##fb.line(30, 70, 40, 80, black)
+##fb.rect(30, 90, 10, 10, black)
+##fb.fill_rect(20, 0, 10, 10, black)
+e.display_master_image(buf)
+e.set_partial_update_mode()
+e.init()
+
+fb.rect(12, 56, 96, 16, white)
+e.display(buf)
+
+e.sleep()
+fb.fill_rect(56, 20, 20, 20, white)
+e.display(buf)
+
+e.wakeup()
+fb.text("wakeup", 10, 20, white)
+e.display(buf)
+e.clear_display(0xff)
+e.sleep()