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# SPDX-License-Identifier: LGPL-3.0-or-later
# Copyright (C) 2020 Daniel Thompson
""" Simulated ST7789 display and CST816S touchscreen. """
import sys
import sdl2
import sdl2.ext
CASET = 0x2a
RASET = 0x2b
RAMWR = 0x2c
WIDTH = 240
HEIGHT = 240
class ST7789Sim(object):
def __init__(self):
self.x = 0
self.y = 0
self.colclip = [0, WIDTH-1]
self.rowclip = [0, HEIGHT-1]
self.cmd = 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(windowsurface)
pixelview = sdl2.ext.pixels2d(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)
pixel = (((rgb & 0xf800) << 8) +
((rgb & 0x07e0) << 5) +
((rgb & 0x001f) << 3))
pixelview[self.x][self.y] = 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
window.refresh()
class CST816SSim():
def __init__(self):
self.regs = bytearray(64)
def readfrom_mem_into(self, addr, reg, dbuf, pins):
tick(pins)
if not self.regs[1]:
raise OSError
dbuf[:] = self.regs[reg:len(dbuf)+reg]
if self.regs[3]:
self.regs[3] = 0
else:
self.regs[1] = 0
def handle_key(self, key):
"""Use key presses to provoke different touchscreen events.
Note: The Down key provokes an upward swipe and vice versa.
Same for left and right. That is because the swipe up
gesture means show me the screen the is below me (hence
the controls are inverted compared to joystick-like
direction control).
"""
if key.keysym.sym == sdl2.SDLK_DOWN:
self.regs[1] = 2
elif key.keysym.sym == sdl2.SDLK_UP:
self.regs[1] = 1
elif key.keysym.sym == sdl2.SDLK_LEFT:
self.regs[1] = 4
elif key.keysym.sym == sdl2.SDLK_RIGHT:
self.regs[1] = 3
self.regs[3] = 0x80
self.raise_interrupt()
def handle_mousebutton(self, button):
self.regs[1] = 5
self.regs[4] = button.x
self.regs[6] = button.y
self.raise_interrupt()
def raise_interrupt(self):
pass
sdl2.ext.init()
window = sdl2.ext.Window("ST7789", size=(WIDTH, HEIGHT))
window.show()
windowsurface = window.get_surface()
sdl2.ext.fill(windowsurface, (0, 0, 0))
spi_st7789_sim = ST7789Sim()
i2c_cst816s_sim = CST816SSim()
def tick(pins):
events = sdl2.ext.get_events()
for event in events:
if event.type == sdl2.SDL_QUIT:
sdl2.ext.quit()
sys.exit(0)
elif event.type == sdl2.SDL_MOUSEBUTTONDOWN:
i2c_cst816s_sim.handle_mousebutton(event.button)
elif event.type == sdl2.SDL_KEYDOWN:
if event.key.keysym.sym == sdl2.SDLK_TAB:
pins['BUTTON'].value(0)
else:
i2c_cst816s_sim.handle_key(event.key)
elif event.type == sdl2.SDL_KEYUP:
if event.key.keysym.sym == sdl2.SDLK_TAB:
pins['BUTTON'].value(1)
else:
#print(event)
pass
window.refresh()
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