starcontrol/screen.py

# Copyright © 2024 Nicole O'Connor
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# 	http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import atexit
import math
import time

import board
import digitalio
from adafruit_rgb_display import rgb, st7789
from PIL import Image, ImageDraw, ImageOps

running = True
scr = None
scr_light = None
btn_upper = None
btn_lower = None
def screen_init():
    global scr
    global scr_light
    global btn_upper
    global btn_lower

    scr_light = digitalio.DigitalInOut(board.D22)
    scr_light.switch_to_output()
    scr_light.value = True

    # Configuration for CS and DC pins for Raspberry Pi
    cs_pin = digitalio.DigitalInOut(board.CE0)
    dc_pin = digitalio.DigitalInOut(board.D25)
    reset_pin = None
    BAUDRATE = 64000000  # The pi can be very fast!
    # Create the ST7789 display:
    scr = st7789.ST7789(
        board.SPI(),
        cs=cs_pin,
        dc=dc_pin,
        rst=reset_pin,
        baudrate=BAUDRATE,
        width=135,
        height=240,
        x_offset=53,
        y_offset=40,
    )

    scr.fill(rgb.color565(0,0,0))
    btn_upper = digitalio.DigitalInOut(board.D23)
    btn_lower = digitalio.DigitalInOut(board.D24)
    btn_upper.switch_to_input()
    btn_lower.switch_to_input()

@atexit.register
def screen_deinit():
    global running
    running = False # stops update thread

    scr.fill(rgb.color565(0,0,0))
    scr_light.value = False

current_icon = None
wifi_state = 0 # -1 error, 0 disconnected, 1 connected
dns_state = 0  # -1 error, 0 off, 1 running
download_state = 0 # yes/no
screen_on = True

def screen_update():
    global current_icon

    if wifi_state < 1 or dns_state < 1:
        current_icon = Image.open("res/image/problem.png") # ⚠️
    else:
        current_icon = Image.open("res/image/okay.png")    # ✅
    
    #scr.fill(rgb.color565(0,0,0)) # blank
    img_canvas = Image.new("RGB", (135, 240))
    hnd_canvas = ImageDraw.Draw(img_canvas)
    hnd_canvas.rectangle([(0,0), (135,240)], fill=(0,0,0))
    hnd_canvas.text((math.floor(135/2), 0), time.strftime("%H:%M"), # top center of screen, "16:20"
                    fill=(50,200,255), anchor="mt", # cyan, middle-top
                    font_size=16)
    
    img_canvas.paste(current_icon, (math.floor(135/2) - 32, math.floor(240/2) - 32))

    scr.image(img_canvas)

def screen_thread():
    while running:
        screen_update()
        time.sleep(1)