On the device MeshTerm ran, drew every frame, and stayed invisible: the
panel kept the launcher's last frame while a splash nobody could see
waited for a key. The panel is a DRM driver whose /dev/fb0 is fbdev
emulation, and the kernel copies to the glass only what it sees change
through the *mapping*. pwrite() put the pixels in the buffer, where
reading /dev/fb0 back showed them, and never on the panel. The frame
now goes through an mmap, as M5's own LVGL apps write theirs. Checked
on the panel.
Also scripts/cardputer-zero/type-text.py: paste a long string (an API
key, a Wi-Fi password) on another computer and it is typed on the
Cardputer's keyboard over SSH, into whatever app has the screen. Input
is hidden and travels on stdin, never on a command line.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>