greatballoflazers
commented
2 years ago Pi 4 needs max slow down. Two Options. 1) Run with --led-gpio-slowdown=5 2) Change code use runtime options
After line 13:
struct RGBLedRuntimeOptions runtime_options;After line 21: (Leave out comments)
runtime_otions.gpio_slowdown = 5;
runtime_options.daemon = 1; // Why this int and not bool?
runtime_options.drop_privileges = 1; // Why this int and not bool? Does this do anything in C?
runtime_options.do_gpio_init = true; // Why this bool and not int? Does this do anything in C?Change line 23 and 24 to this:
matrix = led_matrix_create_from_options_and_rt_option(&options, &runtime_options);This would in the blind spot. Honestly what I would do is mess around with demo -D 0 to get settings right. Then run c example using those settings make sure the library is happy. By default you can overwrite with command line. Then from there you can change code once you have the timings and stuff settled.
dunlaveys
DavidSzczecina
I know all of this is because of my inexperience with the matrix, C & C++, and makefiles, but I'm trying to learn.
I want to take the c-example and play around with some of the code to get a feel for how the matrix behaves. Let me first check that it is running as expected: The LEDs start with a slight blue/green tint, and cycle up to bright red as the loops run. It does that a few times and then exits. Next, let's say I want to start REALLY simple, so I just switch around the RGB values in the set_pixel parameters (line 42). Should be an easy way to begin, but I immediately hit troubles with compiling/making which is where my inexperience with multiple libraries and all that run into a brick wall that I can't seem to get around.
From the beginning: I install everything from github, following the tutorial on adafruit. I do the curl command followed by the "bash rgb-matrix.sh". I select the hat option, then convenience (multipurpse pi, just playing around, maybe switch when I have an actual project in mind). Everything works perfectly. I've figured out the options to match my matrix size (64x64) and slowdown the gpio since I'm on a pi4. Time to dig in and figure out what the code does.
I edit the .c file and try to compile. I ran into some early trouble because the includes are in a different folder, but I quickly figure that out. I try following the section in the makefile for the commands, but cannot get the compilers to generate a new executable. I know it is because I'm a novice and just used to compiling a c or c++ program where everything is in one folder, but now I'm trying to compile something that uses a bit of both. To test, I make a copy and call it c-examples2.c. I get the .o but cannot get the binary to be created.
Ok, the makefile has all of this sorted out. I figure if I just do a "make" in the examples-api-use directory, it'll handle the recompile for me. As soon as that finishes, I get an error about the snd_bcm2835: found that the Pi sound module is loaded, etc etc, exiting out. I assume this is related to the "quality" vs "convenience" option from install and now the code thinks it is in the other mode. But it was just working when the original install made all the binaries. Trying to run it with no-hardware-pulse doesn't result in any error. It sits and stares at me long enough for me to think the code is running, but no lights. Only way I've found to fix it is to reinstall from github and overwrite everything.
After a couple go-arounds with that, I got smart enough to make my own directory for my examples. I copied c-example and the makefile over and edited the makefile to get rid of all the references to the demo and other examples. Makes without errors, but same results as before. At least now I can just delete this directory and recopy from the original files without a fresh install.
I have just enough knowledge to know it is probably something stupidly simple that I just don't know, but it has stopped me dead in my tracks just as I was going to begin experimenting. It is also something that I don't know well enough to phrase correctly on Google or StackOverflow to get the right results.
Any help would be appreciated. Thank you.