P10 HUB12 Multiplexing Almost There

[cmagnuson]

I'm trying to get a P10 panel with HUB12 interface working and am almost there, but can't get the mapping quite right.

I'm using the adafruit matrix HAT and rewiring the HUB75 OE/GND/A/B/CLK/LAT/R to matching HUB12 pins seems to be working correctly.

The problem I'm seeing is that with the following mapping, I get the same results duplicated on left half and right half of display:

class P10Mapper : public MultiplexMapperBase {
public:
  P10Mapper() : MultiplexMapperBase("P10", 2) {}

  void MapSinglePanel(int x, int y, int *matrix_x, int *matrix_y) const {
    int y_component_matrix_x = ((int)(y/4)) * 8;
    int x_component_matrix_x = (((int)(x/8)) * 32) + (x % 8);
    *matrix_x = x_component_matrix_x + y_component_matrix_x;
    *matrix_y = 0 - ((y % 4) - 3);
  }
};

Using this command: sudo ./demo -D12 --led-gpio-mapping=adafruit-hat --led-rows=16 --led-multiplexing=7

And with another mapping I can solve the left-right split, but then only every 2 rows are displayed (2 on 2 off, etc):

class P10Mapper2 : public MultiplexMapperBase {
public:
  P10Mapper2() : MultiplexMapperBase("P10-2", 4) {}

  void MapSinglePanel(int x, int y, int *matrix_x, int *matrix_y) const {
    int y_component_matrix_x = ((int)(y/4)) * 8;
    int x_component_matrix_x = (((int)(x/8)) * 32) + (x % 8);
    *matrix_x = x_component_matrix_x + y_component_matrix_x;
    *matrix_y = 0 - ((y % 2) - 1);
  }
};

sudo ./demo -D12 --led-gpio-mapping=adafruit-hat --led-rows=16 --led-multiplexing=8 --led-chain=1

I've experimented with the led-row-addr-type and the existing multiplexers but with no success. Any ideas would be greatly appreciated!

[cmagnuson]

For what it's worth, I was able to map out each pixel with the following command: sudo ./demo -D12 --led-gpio-mapping=adafruit-hat --led-rows=16 --led-cols=32 --led-chain=4

When I did less then led-chain=4, I was getting duplicate pixels (display split left and right or top and bottom). I created the following x/y mapping for them, but haven't been able to successfully implement a multiplex mapper that works sized for the 16x32 display

X-mapping:

Y-mapping:

I also tried a command that should be appropriately sized, but after filling rows 0 and 1, rows 2 and 3 did not fill: sudo ./demo -D12 --led-gpio-mapping=adafruit-hat --led-rows=4 --led-cols=128 --led-chain=1

[lbnshrivas]

did you get a solution for your issue?

[cmagnuson]

I didn't but thanks for checking back. I switched to some RGB panels that were supported by rpi-rgb-led-matrix and haven't done any more experimenting with these P10 panels since. Issue can be closed in my opinion

[lbnshrivas]

I have written a transformer for my single color P10 module. Please see #531 . May be it will be useful to you.