[FEATURE REQUEST]: Screen Drawing

[MontyMole98]

This project is cool, but I wish there was support for the LCD screen. This breaks down to these functions:

• Line drawing, using the first two arguments as the points.
• Printing RGF image files to the screen.
• Printing raw pixel data to the screen at any X and Y coordinates, using any aspect ratio, all passed as arguments.
• Printing text to the screen.
• Clearing the screen.

Obviously this is just a request that suits my project's needs, especially because the base NXT programming software had support for these functions in some capacity. It would be much appreciated if this was added.

[schodet]

From the firmware, you have access to system command and direct command. There is no command for the LCD screen.

However, you have access to the “IOMAPs”, have a look at the nxt-screen example to see how it reads from the LCD, you can use the same technique to write to it.

nxt-python/examples/nxt-screen.py

Lines 31 to 53 in 960ca03

	def NXT_get_display_data(b):
	# each "module" has it's own memory region, id, ...
	# for t in b.find_modules():
	# print(t, hex(t[1]))
	mod_display = 0xA0001
	# display is WxH = 100x64 pixels
	# their memory layout is in eight lines of 100 bytes, with each byte encoding
	# a strip of eight vertical pixels
	data = b""
	pixels = [""] * 64
	DisplayOffsetNormal = 119
	for i in range(20):
	data += b.read_io_map(mod_display, DisplayOffsetNormal + i * 40, 40)[1]
	for line in range(8):
	for x in range(100):
	b = data[line * 100 + x]
	for y in range(8):
	bitsels = format(
	b, "08b"
	) # abuse the stringification to get 8 1's and 0's
	pixels[line * 8 + y] += bitsels[7 - y]
	return pixels

You can use your computer power to do anything, just avoid writing one pixel at a time.

Another option is to have a program running on the brick and use messages to communicate with it.