From 61c56598de7c1c3b3406345e263d8297fe4082a4 Mon Sep 17 00:00:00 2001
From: Daniel Thompson <daniel@redfelineninja.org.uk>
Date: Sun, 10 Jan 2021 10:43:50 +0000
Subject: [PATCH] boards: simulator: Add basic mute simulation

Currently the simulator shows redraw artifacts that are concealed
on the real device by using display on/off. We can improve this by
avoiding the refresh when the display is off. This does not match
the behaviour of the real hardware (which goes dark during transitions)
but does make the simulator feel much more comfortable to use.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
---
 wasp/boards/simulator/display.py | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/wasp/boards/simulator/display.py b/wasp/boards/simulator/display.py
index 0fa6ef7..cb97cda 100644
--- a/wasp/boards/simulator/display.py
+++ b/wasp/boards/simulator/display.py
@@ -13,6 +13,8 @@ import numpy as np
 from PIL import Image
 import wasp
 
+DISPOFF = 0x28
+DISPON = 0x29
 CASET = 0x2a
 RASET = 0x2b
 RAMWR = 0x2c
@@ -35,6 +37,7 @@ class ST7789Sim(object):
         self.colclip = [0, WIDTH-1]
         self.rowclip = [0, HEIGHT-1]
         self.cmd = 0
+        self.mute = False
 
     def write(self, data):
         # Converting data to a memoryview ensures we act more like spi.write()
@@ -46,7 +49,14 @@ class ST7789Sim(object):
             # Assume if we get a byte at a time then it is command.
             # This is a simplification do we don't have to track
             # the D/C pin from within the simulator.
-            self.cmd = data[0]
+            cmd = data[0]
+            if cmd == DISPOFF:
+                self.mute = True
+            elif cmd == DISPON:
+                self.mute = False
+                window.refresh()
+            else:
+                self.cmd = data[0]
 
         elif self.cmd == CASET:
             self.colclip[0] = (data[0] << 8) + data[1]
@@ -91,7 +101,8 @@ class ST7789Sim(object):
             
             # Forcibly release the surface to ensure it is unlocked
             del pixelview
-            window.refresh()
+            if not self.mute:
+                window.refresh()
 
 class CST816SSim():
     def __init__(self):
@@ -268,4 +279,3 @@ def tick(pins):
         else:
             #print(event)
             pass
-    window.refresh()