Show image.jpg when switching fb address

Makefile

@@ -8,10 +8,13 @@ all: AppMain.bin m4_loader.bin
 
 .PHONY:
 clean:
-	@rm -f *.bin *.elf
+	@rm -f *.bin *.elf pixels.c
 
-AppMain.bin:
-	@$(AS) main.S -o main.elf
+pixels.c:
+	@python3 img2c.py image.jpg pixels.c
+
+AppMain.bin: pixels.c
+	@$(CC) -nostdlib -static -fPIC -mcpu=cortex-a7 main.S pixels.c -o main.elf
 	@./extract.py -p main.elf AppMain.bin
 
 m4_loader.bin:

img2c.py

@@ -0,0 +1,34 @@
+import sys
+from PIL import Image
+
+
+template = '''void load_pixels() {{
+{lines}
+}};
+'''
+
+im = Image.open(sys.argv[-2]).convert('RGB')
+
+with open(sys.argv[-1], 'w') as f:
+    pixels = []
+    lines = []
+    count = 0
+
+    for y in range(im.size[1]):
+        for x in range(0, im.size[0], 2):
+            r, g, b = im.getpixel((x, y))
+            rgb565 = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
+            pixels.append(rgb565 >> 8)
+            pixels.append(rgb565 & 0xff)
+
+            r, g, b = im.getpixel((x+1, y))
+            rgb565 = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
+            pixels.append(rgb565 >> 8)
+            pixels.append(rgb565 & 0xff)
+
+            u32 = (pixels[0] << 24) + (pixels[1] << 16) + (pixels[2] << 8) + pixels[3]
+            lines.append(f'\t*(unsigned int *)(0x62000000 + {count:7d}) = {u32:#08x};')
+            pixels = []
+            count += 4;
+    f.write(template.format(lines='\n'.join(lines)))
+

main.S

@@ -3,6 +3,7 @@
     .global _start
 
 _start:
+    bl load_pixels
 //M4 RTOS loader snipet prep
     ldr r4, =0x60006400 //fopen addr
     adr r0, [.LC2] //file name

requirements.txt

@@ -0,0 +1 @@
+pillow