wasp: simulator: Add ST7789 simulation

3 files changed, 102 insertions, 7 deletions

diff --git a/wasp/boards/simulator/display.py b/wasp/boards/simulator/display.py
new file mode 100644
index 0000000..dc303d9
--- /dev/null
+++ b/wasp/boards/simulator/display.py
@@ -0,0 +1,73 @@
+""" Simulated ST7789 display. """
+
+import sys
+import sdl2
+import sdl2.ext
+
+CASET = 0x2a
+RASET = 0x2b
+RAMWR = 0x2c
+
+class ST7789Sim(object):
+    def __init__(self, width=240, height=240):
+        sdl2.ext.init()
+
+        self.width = width
+        self.height = height
+
+        self.x = 0
+        self.y = 0
+        self.colclip = [0, width-1]
+        self.rowclip = [0, height-1]
+        self.cmd = 0
+
+        self.window = sdl2.ext.Window("ST7789", size=(width, height))
+        self.window.show()
+        self.windowsurface = self.window.get_surface()
+        sdl2.ext.fill(self.windowsurface, (0, 0, 0))
+
+    def write(self, data):
+        if len(data) == 1:
+            # 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]
+
+        elif self.cmd == CASET:
+            self.colclip[0] = (data[0] << 8) + data[1]
+            self.colclip[1] = (data[2] << 8) + data[3]
+            self.x = self.colclip[0]
+
+        elif self.cmd == RASET:
+            self.rowclip[0] = (data[0] << 8) + data[1]
+            self.rowclip[1] = (data[2] << 8) + data[3]
+            self.y = self.rowclip[0]
+
+        elif self.cmd == RAMWR:
+            pixelview = sdl2.ext.PixelView(self.windowsurface)
+
+            half = False
+            for d in data:
+                if not half:
+                    rgb = d << 8
+                    half = True
+                    continue
+                rgb |= d
+                half = False
+
+                pixel = ((rgb & 0xf800) >> 8,
+                         (rgb & 0x07e0) >> 3,
+                         (rgb & 0x001f) << 3)
+            
+                pixelview[self.y][self.x] = pixel
+
+                self.x += 1
+                if self.x > self.rowclip[1]:
+                    self.x = self.rowclip[0]
+                    self.y += 1
+                if self.y > self.colclip[1]:
+                    self.y = self.colclip[0]
+            
+            # Forcibly release the surface to ensure it is unlocked
+            del pixelview
+            self.window.refresh()
diff --git a/wasp/boards/simulator/machine.py b/wasp/boards/simulator/machine.py
index 2c93770..3f8989f 100644
--- a/wasp/boards/simulator/machine.py
+++ b/wasp/boards/simulator/machine.py
@@ -1,3 +1,5 @@
+import display
+
 class Tracer(object):
     def __init__(self, *args, **kwargs):
         print(f'{self.__class__.__name__}.__init__{args} {kwargs}')
@@ -14,9 +16,10 @@ class Pin(object):
     IN = 'IN'
     OUT = 'OUT'
 
-    def __init__(self, id, direction, value=1):
+    def __init__(self, id, direction, value=1, quiet=False):
         self._id = id
         self._value = 0
+        self._quiet = quiet
 
     def init(self, d, value):
         self.value(value)
@@ -29,12 +32,16 @@ class Pin(object):
 
     def value(self, v=None):
         if v is None:
+            if not self._quiet:
+                print(f'{self._id}: read {self._value}')
             return self._value
         if v:
-            print(self._id + ": on")
+            if not self._quiet:
+                print(self._id + ": set on")
             self._value = False
         else:
-            print(self._id + ": off")
+            if not self._quiet:
+                print(self._id + ": set off")
             self._value = True
 
     def __call__(self, v=None):
@@ -46,9 +53,16 @@ class PWM(Tracer):
 class SPI(object):
     def __init__(self, id):
         self._id = id
+        if id == 0:
+            self.sim = display.ST7789Sim()
+        else:
+            self.sim = None
 
     def init(self, baudrate=1000000,  polarity=0, phase=0, bits=8, sck=None, mosi=None, miso=None):
         pass
 
     def write(self, buf):
-        print("Sending data: " + str(buf))
+        if self.sim:
+            self.sim.write(buf)
+        else:
+            print("Sending data: " + str(buf))
diff --git a/wasp/boards/simulator/watch.py b/wasp/boards/simulator/watch.py
index c6d695f..89faffe 100644
--- a/wasp/boards/simulator/watch.py
+++ b/wasp/boards/simulator/watch.py
@@ -9,6 +9,13 @@ from machine import SPI
 from drivers.st7789 import ST7789_SPI
 from drivers.vibrator import Vibrator
 
+class Backlight(object):
+    def __init__(self, level=1):
+        self.set(level)
+
+    def set(self, level):
+        print(f'BACKLIGHT: {level}')
+
 class Display(ST7789_SPI):
     def __init__(self):
         spi = SPI(0)
@@ -16,11 +23,12 @@ class Display(ST7789_SPI):
         spi.init(polarity=1, phase=1, baudrate=8000000)
     
         # Configure the display
-        cs = Pin("DISP_CS", Pin.OUT)
-        dc = Pin("DISP_DC", Pin.OUT)
-        rst = Pin("DISP_RST", Pin.OUT)
+        cs = Pin("DISP_CS", Pin.OUT, quiet=True)
+        dc = Pin("DISP_DC", Pin.OUT, quiet=True)
+        rst = Pin("DISP_RST", Pin.OUT, quiet=True)
 
         super().__init__(240, 240, spi, cs=cs, dc=dc, res=rst)
 
 display = Display()
+backlight = Backlight()
 vibrator = Vibrator(Pin('MOTOR', Pin.OUT, value=0), active_low=True)