Max7219 Initial power up problem

Max7219 Initial Power-Up [from datasheet]

On initial power-up, all control registers are reset, the display is blanked, and the MAX7219/MAX7221 enter shutdown mode.

Program the display driver prior to display use. Otherwise, it will initially be set to scan one digit, it will not decode data in the data registers, and the intensity register will be set to its minimum value.


The MAX7219 LED display controller – real or fake? Posted on 16 May 2013

http://tronixstuff.com/2013/05/16/the-max7219-led-display-controller-real-or-fake/

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