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Welcome to the LedMatrixSPI wiki!
An Arduino library for controlling multiple 8x8 LED displays in a matrix style format using the MAX7219/7221 display drivers. It does not support 7-segment displays.
The two libraries are identical except that LedMatrix uses a software SPI implementation and LedMatrixSPI uses a hardware SPI implementation. The software version was initially written, but the refresh rates were not sufficient for a large number of displays, so a second hardware SPI version was written. The only advantage of using LedMatrix is you do not have to use the dedicated SPI pins.
NOTE: The library can handle up to 32 rows and 32 columns of 8x8 displays (1,024 8x8 displays or 256 x 256 leds); however, due to display buffering it's unlikely the MCU will have sufficient memory to support more than 180 8x8 displays.