144 lines
4.1 KiB
Python
144 lines
4.1 KiB
Python
# 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):
|
|
tick()
|
|
|
|
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():
|
|
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:
|
|
i2c_cst816s_sim.handle_key(event.key)
|
|
else:
|
|
#print(event)
|
|
pass
|
|
window.refresh()
|