Add Bad Apple on ATMega2560 (not working very well)

Looks like these devices can only use the lower 64 kB as PROGMEM, so the
whole exercise is kinda pointless. Also inflate() is slow af.

src/app/bad-apple-atmega2560-ssd1306/Kconfig

+# Copyright 2020 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: CC0-1.0
+
+prompt "Bad Apple on ATMega2560 + SSD1306 128x32 OLED"
+depends on arch_atmega2560
+depends on meta_driver_timer
+depends on driver_ssd1306 && driver_ssd1306_mode_horizontal
+depends on lib_inflate && lib_inflate_lut
+depends on !loop
+depends on !wakeup

src/app/bad-apple-atmega2560-ssd1306/Makefile.inc

+# vim:ft=make
+#
+# Copyright 2020 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: CC0-1.0

src/app/bad-apple-atmega2560-ssd1306/convert

+#!/bin/sh
+
+# [size=WxH] ./convert.sh <file> -r <frame rate> [additional ffmpeg args]
+
+set -eu
+
+mkdir -p tmp
+
+ffmpeg -i "$@" tmp/frame%4d.png
+
+parallel mogrify -resize "${size:-128x32}" -threshold 50% -- tmp/*.png
+
+echo "#include <avr/pgmspace.h>" > frames.cc
+echo "const unsigned char frame_rate = $3;" >> frames.cc
+./frames-to-cc tmp/*.png >> frames.cc
+
+rm -rf tmp

src/app/bad-apple-atmega2560-ssd1306/frames-to-cc

+#!/usr/bin/env python3
+
+from PIL import Image
+import os
+import sys
+import zlib
+
+buf_w, buf_h = map(int, os.getenv("size", "128x32").split("x"))
+
+
+def load_image(filename):
+    im = Image.open(filename)
+    w, h = im.size
+    buf = [0 for i in range(buf_w * buf_h // 8)]
+    for y in range(min(h, buf_h)):
+        for x in range(min(w, buf_w)):
+            if im.getpixel((x, y)):
+                buf[(y // 8) * buf_w + x] |= 1 << (y % 8)
+    return buf
+
+
+for i in range(1, len(sys.argv) - 2):
+    buf = load_image(sys.argv[i])
+    c_buf = ",".join(map(str, buf))
+    z_buf = zlib.compress(bytes(buf), 9)
+    z_buf = z_buf[2:-4]
+    out_buf = ",".join(map(str, z_buf))
+    print(f"unsigned char const PROGMEM frame{i:04d}[] = {{ {len(z_buf)}, {out_buf} }};")
+
+frames = list()
+for i in range(1, len(sys.argv) - 2):
+    frames.append(f"frame{i:04d}")
+
+prefix = "const unsigned char* const frames[] PROGMEM = {"
+postfix = "};"
+
+print(prefix + ", ".join(frames) + postfix)

src/app/bad-apple-atmega2560-ssd1306/main.cc

+/*
+ * Copyright 2020 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/i2c.h"
+#include "driver/ssd1306.h"
+#include "lib/inflate.h"
+
+#include "driver/timer.h"
+volatile unsigned char timer_done = 0;
+
+#include "frames.cc"
+
+/*
+ * fgrep 'PROGMEM frame' frames.cc | while read line; do echo $line | tr -cd , | wc -c; done | sort -n
+ * set buffer size to maximum number + 1.
+ */
+unsigned char deflate_buf[160];
+unsigned char img_buf[(SSD1306_WIDTH * SSD1306_HEIGHT / 8)];
+
+int main(void)
+{
+	unsigned int i = 0, j = 0;
+	unsigned char line, frame_len;
+	unsigned char *frame;
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+	i2c.setup();
+	ssd1306.init();
+
+	timer.setup_hz(frame_rate);
+	timer_done = 0;
+	timer.start(1);
+
+	while (1) {
+		for (i = 0; i < (sizeof(frames) / sizeof(frames[0])); i++) {
+
+			frame = (unsigned char *)pgm_read_ptr(&frames[i]);
+			frame_len = (unsigned char)pgm_read_byte(&frame[0]);
+
+			for (j = 0; j < frame_len; j++) {
+				deflate_buf[j] = (unsigned char)pgm_read_byte(&frame[j+1]);
+			}
+			inflate(deflate_buf, frame_len + 4, img_buf, sizeof(img_buf));
+
+			while (!timer_done) {
+				arch.idle();
+			}
+			timer.stop();
+			timer_done = 0;
+			timer.start(1);
+
+			ssd1306.showImage(img_buf, SSD1306_WIDTH * SSD1306_HEIGHT / 8);
+		}
+	}
+
+	return 0;
+}
+
+ON_TIMER_INTERRUPT_head
+	timer_done = 1;
+ON_TIMER_INTERRUPT_tail