How to create PanelMappingEntry array according to any module (hub75) module with different mode scan.
(https://github.com/pixelmatix/SmartMatrix/blob/af288cb536bd934d09be309d2346f9a8ffb51f4e/src/MatrixPanelMaps.cpp#L4)
i need to know how to create this array. can you explain…
There’s instructions here:
1 Like
Following is my practice for reference.
Firstly, to setup rpi-rgb-led-matrix library based on Raspberry PI.
Use demo in examples-api-use, by setting correct multiplexing to get correct display. Remember it’s number. Then hack ApplyPixelMapper() of led-matrix.cc in directory lib, to print x, y
bool RGBMatrix::Impl::ApplyPixelMapper(const PixelMapper *mapper) {
if (mapper == NULL) return true;
using internal::PixelDesignatorMap;
const int old_width = shared_pixel_mapper_->width();
const int old_height = shared_pixel_mapper_->height();
int new_width, new_height;
if (!mapper->GetSizeMapping(old_width, old_height, &new_width, &new_height)) {
return false;
}
printf("ApplyPixelMapper - old_w = %d, old_h = %d, new_w = %d, new_h = %d\n", old_width, old_height, new_width, new_height);
PixelDesignatorMap *new_mapper = new PixelDesignatorMap(
new_width, new_height, shared_pixel_mapper_->GetFillColorBits());
for (int y = 0; y < new_height; ++y) {
for (int x = 0; x < new_width; ++x) {
int orig_x = -1, orig_y = -1;
mapper->MapVisibleToMatrix(old_width, old_height,
x, y, &orig_x, &orig_y);
if (orig_x < 0 || orig_y < 0 ||
orig_x >= old_width || orig_y >= old_height) {
fprintf(stderr, "Error in PixelMapper: (%d, %d) -> (%d, %d) [range: "
"%dx%d]\n", x, y, orig_x, orig_y, old_width, old_height);
continue;
}
printf("ApplyPixelMapper -> x = %d, y = %d, orig_x = %d, orig_y=%d\n", x, y, *orig_x, *orig_y);
const internal::PixelDesignator *orig_designator;
orig_designator = shared_pixel_mapper_->get(orig_x, orig_y);
*new_mapper->get(x, y) = *orig_designator;
}
}
delete shared_pixel_mapper_;
shared_pixel_mapper_ = new_mapper;
return true;
}
Then compile library and run demo again, here set --led-row/–led-col value to only one panel with one chain/parallel. Now you could see two pairs x/y. then according to your scan mode, row/col to setup your PanelMap.