sudo apt update
sudo apt install build-essential gcc-arm-none-eabi git cmake python3

git clone --recurse-submodules https://github.com/benob/picocalc_lua
cd picocalc_lua

mkdir build
cd build
cmake .. -DPICO_BOARD=pico2 # change depending on your board
make

sudo cp picolua.uf2 /dev/disk/by-label/RP2350/

Ctrl-Alt-F1   Reboot in BOOTSEL mode
Ctrl-Alt-Del  Reboot 
Enter         Excute
Ctrl-C        Clear line
Ctrl-L        Clear screen
Up/Down       Small history

lua> a=2
lua> b=2
print(a*b)
4

lua> LED=25
lua> set_output(LED, true)
lua> set_pin(LED, true)

-- filesystem
fp = fs_open(path, mode) -- mode = 1 to read, 2 to write (see FatFS docs)
fs_close(fp)
data = fs_read(fp, size)
size = fs_write(fp, data)
fs_seek(fp, where)
where = fs_tell(fp)
fs_eof(fp)
size = fs_size(fp)
fs_sync(fp)
dir = fs_opendir(path)
fs_closedir(dir)
size, is_dir, name = fs_readdir(dir)
size, is_dir, name = fs_stat(path)
fs_unlink(path)
fs_rename(old_path, new_path)
fs_mkdir(path)
fs_chdir(path)
fs_mount(path, mode)
total_kb, free_kb = fs_getfree(path)

-- pico/pico2
bytes = get_total_memory()
bytes = get_free_memory()
reset() -- reboot
bootsel() -- reboot as usb disk for flashing firmware
set_output(pin, mode)
set_pin(pin, value)
value = get_pin(pin)

-- keyboard input
state, modifiers, key = keyboard_wait()
state, modifiers, key = keyboard_poll() -- key = 0 if no event

-- drawing
draw_text(x, y, fg, bg, text)
draw_clear()
color = draw_color_from_rgb(r, g, b)
r, g, b = draw_color_to_rgb(color)
color = draw_color_from_hsv(h, s, v)
h, s, v = draw_color_to_hsv(color)
color = draw_color_add(c1, c2)
color = draw_color_subtract(c1, c2)
color = draw_color_mul(c1, factor)
draw_point(x, y, color)
draw_rect(x, y, width, height, color)
draw_fill_rect(x, y, width, height, color)
draw_line(x1, y1, x2, y2, color)
draw_circle(x, y, radius, color)
draw_fill_circle(x, y, radius, color)
draw_polygon(points, color) -- points is table {x1, y1, x2, y2, ...}
draw_fill_polygon(points, color)
draw_triangle_shaded(c1, x1, y1, c2, y1, y2, c3, y1, y2)