# 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 SKIN = { 'fname' : 'res/simulator_skin.png', 'size' : (337, 427), 'button_profile' : 9, 'offset' : (53, 93) } 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)) pv_x = self.x + SKIN['adjust'][0] pv_y = self.y + SKIN['adjust'][1] pixelview[pv_x][pv_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 writeto_mem(self, addr, reg, buf, pins): tick(pins) if reg == 0xa5: # This will be a sleep command... which we can ignore return raise OSError def handle_key(self, key, pins): """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 elif key.keysym.sym == sdl2.SDLK_n: # Allow NEXT to be tested on the simulator self.regs[1] = 253 self.regs[3] = 0x80 self.raise_interrupt(pins) def handle_mousebuttondown(self, button, pins): self.down_x = button.x self.down_y = button.y if self.down_x < 50: pins['BUTTON'].value(0) def handle_mousebuttonup(self, button, pins): if self.down_x < 50: pins['BUTTON'].value(1) return down_x = max(0, min(239, self.down_x-SKIN['adjust'][0])) down_y = max(0, min(239, self.down_y-SKIN['adjust'][1])) up_x = max(0, min(239, button.x-SKIN['adjust'][0])) up_y = max(0, min(239, button.y-SKIN['adjust'][1])) mv_x = up_x - down_x mv_y = up_y - down_y # Swipe detection if abs(mv_x) + abs(mv_y) < 24: self.regs[1] = 5 elif abs(mv_x) > abs(mv_y): self.regs[1] = 4 if mv_x > 0 else 3 else: self.regs[1] = 1 if mv_y > 0 else 2 self.regs[4] = up_x; self.regs[6] = up_y; self.raise_interrupt(pins) def raise_interrupt(self, pins): pins['TP_INT'].raise_irq() # Derive some extra values for padding the display SKIN['left_pad'] = 9 SKIN['right_pad'] = SKIN['left_pad'] + SKIN['button_profile'] SKIN['top_pad'] = 3 SKIN['bottom_pad'] = 3 SKIN['window'] = (SKIN['size'][0] + SKIN['left_pad'] + SKIN['right_pad'], SKIN['size'][1] + SKIN['top_pad'] + SKIN['bottom_pad']) SKIN['adjust'] = (SKIN['offset'][0] + SKIN['left_pad'], SKIN['offset'][1] + SKIN['top_pad']) sdl2.ext.init() window = sdl2.ext.Window("ST7789", size=SKIN['window']) window.show() windowsurface = window.get_surface() sdl2.ext.fill(windowsurface, (0xff, 0xff, 0xff)) skin = sdl2.ext.load_image(SKIN['fname']) sdl2.SDL_BlitSurface(skin, None, windowsurface, sdl2.SDL_Rect( SKIN['left_pad'], SKIN['top_pad'], SKIN['size'][0], SKIN['size'][1])) sdl2.SDL_FreeSurface(skin) window.refresh() 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_mousebuttondown(event.button, pins) elif event.type == sdl2.SDL_MOUSEBUTTONUP: i2c_cst816s_sim.handle_mousebuttonup(event.button, pins) 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, pins) elif event.type == sdl2.SDL_KEYUP: if event.key.keysym.sym == sdl2.SDLK_TAB: pins['BUTTON'].value(1) else: #print(event) pass window.refresh()