Hi,
I want to drive a small (180x32 pixel) VFD display from plan9.
It talks i2c and can be driven as a text or graphics device.
One irritation is it aligns bitmap bytes verticaly. i.e. the display's
memory map appears to be a tradational 32x180 pixel display.
I am going to talk to this from a raspberry pi.
I see several options:
resurect a small graphics library I wrote in the last milenimum, this
knows about the weird layout but only supports rather nasty fonts and
very simple windowing.
talk text only to the display - again rather nasty fonts.
draw the images in a plan9 window under rio. A seperate process
which reads /dev/wsys/n/window, transforms it and sends it to the VFD.
I would also need a backing buffer in VFD layout so only the changed
bytes are sent.
Is there another way?
Could I run the plan9 graphics subsystem in a stand alone app rather
than involving the kernel?
I think I can but are there any examples of this?
Though this sounds nice, is it worth the hassle of doing this?
Any opinions?
-Steve
