B4R Library u8gr and u8x8 library?

Tien Lee

New Member
It should be quite simple to call this library with inline c. Start with running the Arduino IDE examples. Do they work?

Hi, thanks! I have everything working because I did have a background in microcontrollers although I haven't been doing any for the past 13 years after a change in career (I don't think arduino existed back then, we played with Atmel AVR microcontrollers in assembly language). I inlined a different code (from Jaycar's Christmas clock https://www.jaycar.com.au/Christmas-clock) because I bought the led screen from them and I have finally gotten text mode to work. Took me awhile to figure out about passing parameters to the inline code until I dug around the generated C files to find the methods associated with Object class... So then I figured that I could typecast from the void * from toPointer to char *. I still haven't figured out how to pass multiple parameters, but worked around it by sending a Byte and taking the lower 4 bits as x and upper 4 bits as y for setting the cursor. I am still working out how to get Graphics to work.

Just thought that this library seems to support many leds. Will it be wrapped for use in B4R?


Active Member
Licensed User
Longtime User
Hi, I am totally new to Arduino. But bought a LED matrix screen that uses a ST7920 sold locally. I found a library that appears to work with it, but I can't find it on B4R and this forum. Is there any way I can make a wrapper for it or someone can do so? Sorry if I failed to find it somehow. I did a search.



I know this post is a bit old, in case you didn't find an example who satisfy, you have one below with source i posted recently, it use u8g lib but that's the same author and it's easy to adapt at his new library u8g2 :