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schodet avatar schodet commented on September 5, 2024

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.

from nxt-python.

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