I have a common anode bi-color led matrix with 24 pins and want to drive two of these using one microcontroller . So I decided to try Max7219 driver for that. But being a novice I'm having a hard time figuring out what to do and the online resources seem to be centered around arduino. I did find a library developed by Davide Gironi. But it seems to be working with a common cathode matrix. So I changed the rows to columns to adapt with the common anode structure but with no luck. Can you please give me some clues to where to look for the solution?
Driving a bi-color 8*8 led matri with Max7219 and Atmega 16 or similar microcontroller
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I'd try to light up a single led first, then a row and column without the library. Once you have a good understanding how it works you can either write a library yourself or adapt the low level driver firmware in the library you're using. Once you've got working code, you can debug the library until it works.
Here's some pseudo code. I'm not very familiar with the exact functions of Atmega 16 but I'm sure you're able to to replace the delay and port configuration with the proper code.