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Content # card10slide # by @scy # see https://github.com/scy/card10slide import display import os import utime WIDTH = 160 HEIGHT = 80 IMAGE_DIR = "/slideshow" def render_error(err1, err2): with display.open() as disp: disp.clear() disp.print(err1, posx=80 - round(len(err1) / 2 * 14), posy=18) disp.print(err2, posx=80 - round(len(err2) / 2 * 14), posy=42) disp.update() disp.close() def test_image(): with display.open() as d: for x in range(WIDTH): for y in range(HEIGHT): d.pixel(x, y, col=(0, x, y)) d.update() def read_number(file): buffer = "" ignore_until_newline = False while True: byte = file.read(1) if ignore_until_newline: if byte == "\r" or byte == "\n": ignore_until_newline = False elif byte >= "0" and byte <= "9": buffer += byte elif byte == "#": # comment ignore_until_newline = True elif buffer != "": # we already have some digits and now a non-digit return int(buffer) def render_ppm(filename): with open(filename, "r") as file: try: if file.read(2) != "P6": raise RuntimeError("no P6 file") if read_number(file) != WIDTH: raise RuntimeError("width != " + str(WIDTH)) if read_number(file) != HEIGHT: raise RuntimeError("height != " + str(HEIGHT)) max_color = read_number(file) if max_color < 1 or max_color > 255: raise RuntimeError("8bit only") with display.open() as d: for y in range(HEIGHT): row = bytearray(file.read(3 * WIDTH)) for x in range(WIDTH): offset = 3 * x d.pixel(x, y, col=(row[offset], row[offset + 1], row[offset + 2])) d.update() except RuntimeError as e: render_error(filename, str(e)) def run_slideshow(): filenames = list(filter(lambda filename: filename.endswith(".ppm"), os.listdir(IMAGE_DIR))) while True: for filename in filenames: render_ppm(IMAGE_DIR + "/" + filename) utime.sleep(15) run_slideshow()