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""" 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.colclip[1]:
self.x = self.colclip[0]
self.y += 1
if self.y > self.rowclip[1]:
self.y = self.rowclip[0]
# Forcibly release the surface to ensure it is unlocked
del pixelview
self.window.refresh()
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