py code doesn't work so I'm going to open a discussion over at N2. In pure server mode, it always runs at a maximum clock rate of 600 MHz without being used. The problem with the N2 is that I can't get the MAXX7219.py code to work with it. This time it's about downclocking the GPU, the graphics processor of the ODROID-XU4.
This exact same setup with 12 matrices (96 x 8) on an N2 worked just fine. I tried troubleshooting the signal lines, MOSI, SCLK and CE0 and I didn't resolve anything in particular but I was favoring the SCLK line as the probable issue. I even tried adding a separate 5v supply with 2.4A available to the power input of a 72 x 8 array and the LEDS still garbled. Of course I needed to modify the code for the dot_shift_test.c to incorporate more matrices. But this can be fixed for the XU4 with the XU4 Shifter Shield which adapts them for voltages used in the market. This is with both 16.04 and 18.04 as well as using the dot_shift_test.c and a Python 2.7 LED Matrix code (MAXX7219array.py) The ODROID GPIO pins operate at 1.8V which means that it cannot support most accessories and sensors on the market which operate at 3.3V or 5V. One issue I have discovered with the XU4 is it's limitation with the number of 8x8 LED modules that can be cascaded.Īny more than 8 modules cascaded, essentially creating a 64 x 8 array, the XU4 / Shifter Shield will load and garble will ensue. I successfully installed SPIDEV for the XU4 and also for WiringPi as well by upgrading to 18.04īoth work fine with dot_shift_test when compiled from dot_shift_test.c with either the #define USE_WIRING_PI_LIB enabled or commented out.
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