Demo project, describing how to connect LED matrix to Carambola using HT1632 LED driver.

http://www.8devices.com/wiki_carambola/ ... ing_ht1632

David, I will put full sources as package next week. I have finished this project yesterday/today at 1:30 am

I was a bit faster than I thought. Sorry it is not much documented, but at least it can be compiled and works -

Ah, that makes it a lot clearer. I assume this is a lot faster than accessing /dev/gpio and /sys/class/gpio?

I don't know what times you have got using /dev/gpio and /sys/class/gpio, but see attached screenshots from oscilloscope. Software - this exact clock.

Single bit on data line 230ns (freq: 4.35MHz).


Full update of 8x32 pixels + extras 410us (freq: 2.44kHz)


Actually I was a bit surprised, thought it will be much slower.

Now I hope to see more projects from you (and all community)

If memory serves me correct, I reach about 270kHz using /dev/gpio. A lot slower than your method, so it is worth experimenting a bit more

Ok, here we go