ILI9341: Provide fix for some Chinese display modules.

README.md

@@ -147,6 +147,7 @@ development so check for updates.
  7.4 [Class TSequence](./README.md#74-class-tsequence) Plotting realtime, time sequential data.  
 8. [ESP32 touch pads](./README.md#8-esp32-touch-pads) Replacing buttons with touch pads.  
 9. [Realtime applications](./README.md#9-realtime-applications) Accommodating tasks requiring fast RT performance.  
+
 [Appendix 1 Application design](./README.md#appendix-1-application-design) Tab order, button layout, encoder interface, use of graphics primitives  
 [Appendix 2 Freezing bytecode](./README.md#appendix-2-freezing-bytecode) Optional way to save RAM.  
 [Appendix 3 Cross compiling](./README.md#appendix-3-cross-compiling) Another way to save RAM.  

drivers/ili94xx/ili9486.py

@@ -66,7 +66,7 @@ class ILI9486(framebuf.FrameBuffer):
         return cls.COLOR_INVERT ^ ((r & 0xF8) | (g & 0xE0) >> 5 | (g & 0x1C) << 11 | (b & 0xF8) << 5)
 
     # Transpose width & height for landscape mode
-    def __init__(self, spi, cs, dc, rst, height=320, width=480, usd=False, init_spi=False):
+    def __init__(self, spi, cs, dc, rst, height=320, width=480, usd=False, mirror=False, init_spi=False):
         self._spi = spi
         self._cs = cs
         self._dc = dc
@@ -107,7 +107,11 @@ class ILI9486(framebuf.FrameBuffer):
         # Default page address start == 0 end == 0x1DF (479)
         if self._long != 480:
             self._wcd(b"\x2b", int.to_bytes(self._long - 1, 4, "big"))  # SET_PAGE ht
-        self._wcd(b"\x36", b"\x48" if usd else b"\x88")  # MADCTL: RGB portrait mode
+#        self._wcd(b"\x36", b"\x48" if usd else b"\x88")  # MADCTL: RGB portrait mode
+        madctl = 0x48 if usd else 0x88
+        if mirror:
+            madctl ^= 0x80
+        self._wcd(b"\x36", madctl.to_bytes(1, 'big'))  # MADCTL: RGB portrait mode
         self._wcmd(b"\x11")  # sleep out
         self._wcmd(b"\x29")  # display on