├── .gitignore ├── .gitmodules ├── COPYING ├── Makefile ├── README.md ├── img ├── chained-64x64.jpg └── pp-vid.jpg └── pixel-push.cc /.gitignore: -------------------------------------------------------------------------------- 1 | pixel-push 2 | *.o 3 | -------------------------------------------------------------------------------- /.gitmodules: -------------------------------------------------------------------------------- 1 | [submodule "matrix"] 2 | path = matrix 3 | url = https://github.com/hzeller/rpi-rgb-led-matrix.git 4 | [submodule "pp-server"] 5 | path = pp-server 6 | url = https://github.com/hzeller/pixelpusher-server 7 | -------------------------------------------------------------------------------- /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | CXXFLAGS=-Wall -O3 -g 2 | OBJECTS=pixel-push.o 3 | BINARIES=pixel-push 4 | 5 | RGB_INCDIR=matrix/include 6 | RGB_LIBDIR=matrix/lib 7 | RGB_LIBRARY_NAME=rgbmatrix 8 | RGB_LIBRARY=$(RGB_LIBDIR)/lib$(RGB_LIBRARY_NAME).a 9 | 10 | PP_INCDIR=pp-server/include 11 | PP_LIBDIR=pp-server/lib 12 | PP_LIBRARY_NAME=pixel-push-server 13 | PP_LIBRARY=$(PP_LIBDIR)/lib$(PP_LIBRARY_NAME).a 14 | 15 | LDFLAGS+=-L$(PP_LIBDIR) -l$(PP_LIBRARY_NAME) \ 16 | -L$(RGB_LIBDIR) -l$(RGB_LIBRARY_NAME) \ 17 | -lrt -lm -lpthread 18 | 19 | all : pixel-push 20 | 21 | pixel-push : $(OBJECTS) $(RGB_LIBRARY) $(PP_LIBRARY) 22 | $(CXX) $(CXXFLAGS) $(OBJECTS) -o $@ $(LDFLAGS) 23 | 24 | $(RGB_LIBRARY): FORCE 25 | $(MAKE) -C $(RGB_LIBDIR) 26 | 27 | $(PP_LIBRARY): FORCE 28 | $(MAKE) -C $(PP_LIBDIR) 29 | 30 | pixel-push.o : pixel-push.cc 31 | 32 | %.o : %.cc 33 | $(CXX) -I$(PP_INCDIR) -I$(RGB_INCDIR) $(CXXFLAGS) -c -o $@ $< 34 | 35 | clean: 36 | rm -f $(OBJECTS) $(BINARIES) 37 | $(MAKE) -C $(RGB_LIBDIR) clean 38 | $(MAKE) -C $(PP_LIBDIR) clean 39 | 40 | FORCE: 41 | .PHONY: FORCE 42 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Controlling RGB LED display on Raspberry Pi GPIO via PixelPusher protocol 2 | ========================================================================= 3 | 4 | [![Example video][vid]](http://youtu.be/ZglGuMaKvpY) 5 | 6 | 7 | Code is (c) Henner Zeller , 8 | license: GNU General Public License, Version 3.0 9 | 10 | For details of the RGB Matrix library used and how to connect, 11 | see the github over at [Raspberry Pi RGB Matrix][rgb-matrix-lib]. 12 | 13 | Compiling 14 | --------- 15 | Clone with `--recursive` to get the RGB matrix submodule when cloning 16 | this repository: 17 | 18 | git clone --recursive https://github.com/hzeller/rpi-matrix-pixelpusher.git 19 | 20 | (If you did a `git pull` to get the latest state, also make sure to get the latest matrix code: 21 | type `git submodule update`). 22 | 23 | Wiring 24 | ------ 25 | For wiring, please have a look at the [library documentation][rgb-matrix-lib]. 26 | 27 | You can choose the wiring you are using with the option `--led-gpio-mapping` 28 | on the command line. E.g. if you are connected to an Adafruit HAT, then it is 29 | `--led-gpio-mapping=adafruit-hat` or `--led-gpio-mapping=adafruit-hat-pwm` 30 | depending on if you did the PWM modification (which you absolutely should to 31 | reduce flicker. 32 | 33 | Running 34 | ------- 35 | Simply run the program as root (which is needed to access the GPIO pins). It 36 | will drop its privileges once it has set up the hardware. 37 | 38 | $ make 39 | $ sudo ./pixel-push 40 | 41 | These are the available options 42 | 43 | ``` 44 | usage: ./pixel-push 45 | Options: 46 | -l : Switch on logarithmic response (default: off) 47 | -i : network interface, such as eth0, wlan0. Default eth0 48 | -G : PixelPusher group (default: 0) 49 | -C : PixelPusher controller (default: 0) 50 | -a : if used with artnet bridge. Default 0,0 51 | -u : Max UDP data/packet (default 1460) 52 | Best use the maximum that works with your network (up to 65507). 53 | -d : Same as --led-daemon. Use this when starting in init scripts. 54 | --led-gpio-mapping= : Name of GPIO mapping used. Default "regular" 55 | --led-rows= : Panel rows. Typically 8, 16, 32 or 64. (Default: 32). 56 | --led-cols= : Panel columns. Typically 32 or 64. (Default: 32). 57 | --led-chain= : Number of daisy-chained panels. (Default: 1). 58 | --led-parallel= : Parallel chains. range=1..3 (Default: 1). 59 | --led-multiplexing=<0..6> : Mux type: 0=direct; 1=Stripe; 2=Checkered; 3=Spiral; 4=ZStripe; 5=ZnMirrorZStripe; 6=coreman (Default: 0) 60 | --led-pixel-mapper : Semicolon-separated list of pixel-mappers to arrange pixels. 61 | Optional params after a colon e.g. "U-mapper;Rotate:90" 62 | Available: "Rotate", "U-mapper". Default: "" 63 | --led-pwm-bits=<1..11> : PWM bits (Default: 11). 64 | --led-brightness=: Brightness in percent (Default: 100). 65 | --led-scan-mode=<0..1> : 0 = progressive; 1 = interlaced (Default: 0). 66 | --led-row-addr-type=<0..2>: 0 = default; 1 = AB-addressed panels; 2 = direct row select(Default: 0). 67 | --led-show-refresh : Show refresh rate. 68 | --led-inverse : Switch if your matrix has inverse colors on. 69 | --led-rgb-sequence : Switch if your matrix has led colors swapped (Default: "RGB") 70 | --led-pwm-lsb-nanoseconds : PWM Nanoseconds for LSB (Default: 130) 71 | --led-no-hardware-pulse : Don't use hardware pin-pulse generation. 72 | --led-slowdown-gpio=<0..2>: Slowdown GPIO. Needed for faster Pis/slower panels (Default: 1). 73 | --led-daemon : Make the process run in the background as daemon. 74 | --led-no-drop-privs : Don't drop privileges from 'root' after initializing the hardware. 75 | ``` 76 | 77 | This will advertise itself as a 78 | PixelPusher device 79 | on the network. Number of 'strips' will be number of rows, so 16 or 32 multiplied by the parallel panels (1 .. 3). 80 | 81 | #### Network UDP packet size 82 | The `-u` parameter specifies the size of the allowed UDP packets. Some network 83 | switches (and the original PixelPusher hardware) don't like large packets 84 | so the default is a conservative 1460 here. 85 | 86 | But since we have a lot of pixels, using the highest number possible is 87 | desirable so ideally we can transmit a full frame-buffer with one packet (use 88 | something like 65507 here): 89 | 90 | ``` 91 | sudo ./pixel-push -u 65507 92 | ``` 93 | 94 | Even if the network supports it, sometimes sending devices limit the packet size (e.g. iOS, 8192 seems to be the limit of packets to send; important if you use 95 | LED labs softare) so we have to change: 96 | 97 | ``` 98 | sudo ./pixel-push -u 8192 99 | ``` 100 | 101 | Controlling Software 102 | -------------------- 103 | You can control these for instance with the Processing framework 104 | . The processing framework already has a contrib 105 | library section that allows you to select PixelPusher supporting libs. 106 | 107 | Another software supporting the PixelPusher support is L.E.D. Lab http://www.ledlabs.co/ 108 | 109 | Artnet / sACN 110 | ------------- 111 | If you use the [artnet bridge][artnet], you can specify the artnet-universe and the 112 | artnet-channel with the `-a` option: 113 | 114 | sudo ./pixel-push -a1,1 115 | 116 | 117 | Larger displays 118 | --------------- 119 | 120 | Generally, if you want larger displays, it is suggested to first use the 121 | feature of connecting multiple parallel chains to one Raspberry Pi; the [adapter] 122 | in the underlying project provides three outputs. 123 | 124 | If you have the Adafruit HAT, then you only can do one chain, but you can 125 | arrange them in a sideways 'U' shape to get a more square display. This 126 | then can be mapped correctly with `--led-pixel-mapper="U-mapper"`. 127 | 128 | Here are four panels arranged in a square on a single 129 | connector, typically something you might want do do if you want a 64x64 130 | arrangement of four 32x32 displays on an Adafruit HAT (which only provides one 131 | chain): 132 | 133 | ``` 134 | [<][<] }--- Pi connector #1 (looking from the front) 135 | [>][>] 136 | ``` 137 | 138 | (`--led-pixel-mapper="U-mapper" --led-chain=4 --led-parallel=1`). 139 | 140 | This is how it looks wired up from the back: 141 | 142 | ![Chaining multiple displays][matrix64] 143 | 144 | How about 6 panels ? 145 | ``` 146 | [<][<][<] }--- Pi connector #1 147 | [>][>][>] 148 | ``` 149 | 150 | (`--led-pixel-mapper="U-mapper" --led-chain=6 --led-parallel=1`). 151 | 152 | 153 | This even works if you have multiple parallel chains. Here is an arrangement 154 | with two chains with 8 panels each: 155 | 156 | ``` 157 | [<][<][<][<] }--- Pi connector #1 158 | [>][>][>][>] 159 | [<][<][<][<] }--- Pi connector #2 160 | [>][>][>][>] 161 | ``` 162 | 163 | (`--led-pixel-mapper="U-mapper" --led-chain=8 --led-parallel=2`). 164 | 165 | 166 | The `--led-pixel-mapper="U-mapper"` option essentially gives you half the 167 | width of a panel, but double the height. 168 | 169 | If you have a Raspberry Pi 2 or later consider assembling a display using 170 | parallel chains, for instance using the [adapter] that is provided in the 171 | RGB matrix project 172 | 173 | [rgb-matrix-lib]: https://github.com/hzeller/rpi-rgb-led-matrix 174 | [matrix64]: ./img/chained-64x64.jpg 175 | [vid]: ./img/pp-vid.jpg 176 | [artnet]: http://heroicrobotics.boards.net/thread/39/artnet-support-sacn 177 | [adapter]: https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/adapter/active-3 -------------------------------------------------------------------------------- /img/chained-64x64.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hzeller/rpi-matrix-pixelpusher/e3699cee6a2e4915d19d8df6076e1cd1424adee2/img/chained-64x64.jpg -------------------------------------------------------------------------------- /img/pp-vid.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hzeller/rpi-matrix-pixelpusher/e3699cee6a2e4915d19d8df6076e1cd1424adee2/img/pp-vid.jpg -------------------------------------------------------------------------------- /pixel-push.cc: -------------------------------------------------------------------------------- 1 | // -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*- 2 | // PixelPusher protocol implementation for LED matrix 3 | // 4 | // Copyright (C) 2013 Henner Zeller 5 | // 6 | // This program is free software; you can redistribute it and/or modify 7 | // it under the terms of the GNU General Public License as published by 8 | // the Free Software Foundation; either version 3 of the License, or 9 | // (at your option) any later version. 10 | // 11 | // This program is distributed in the hope that it will be useful, 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | // GNU General Public License for more details. 15 | // 16 | // You should have received a copy of the GNU General Public License 17 | // along with this program. If not, see . 18 | 19 | #include 20 | #include 21 | #include 22 | #include 23 | #include 24 | 25 | #include "led-matrix.h" 26 | #include "pp-server.h" 27 | 28 | using namespace rgb_matrix; 29 | 30 | static const int kMaxUDPPacketSize = 65507; // largest practical w/ IPv4 header 31 | static const int kDefaultUDPPacketSize = 1460; 32 | 33 | // Interface to our RGBMatrix 34 | class RGBMatrixDevice : public pp::OutputDevice { 35 | public: 36 | // Takes over ownerhip of matrix. 37 | RGBMatrixDevice(rgb_matrix::RGBMatrix *matrix) 38 | : matrix_(matrix), 39 | off_screen_(matrix_->CreateFrameCanvas()), 40 | on_screen_(matrix_->SwapOnVSync(NULL)), 41 | draw_canvas_(NULL) { 42 | } 43 | 44 | ~RGBMatrixDevice() { delete matrix_; } 45 | 46 | virtual int num_strips() const { return matrix_->height(); } 47 | virtual int num_pixel_per_strip() const { return matrix_->width(); } 48 | 49 | virtual void StartFrame(bool full_update) { 50 | // If we get a full update, we write the output to an off-screen and swap 51 | // on next VSync to minimize tearing. 52 | full_update_requested_ = full_update; 53 | draw_canvas_ = full_update_requested_ ? off_screen_ : on_screen_; 54 | } 55 | 56 | virtual void SetPixel(int strip, int pixel, 57 | const ::pp::PixelColor &col) { 58 | draw_canvas_->SetPixel(pixel, strip, col.red, col.green, col.blue); 59 | } 60 | 61 | virtual void FlushFrame() { 62 | if (full_update_requested_) { 63 | on_screen_ = off_screen_; 64 | off_screen_ = matrix_->SwapOnVSync(off_screen_); 65 | } 66 | } 67 | 68 | private: 69 | RGBMatrix *const matrix_; 70 | FrameCanvas *off_screen_; 71 | FrameCanvas *on_screen_; 72 | bool full_update_requested_; 73 | Canvas *draw_canvas_; 74 | }; 75 | 76 | static int usage(const char *progname) { 77 | fprintf(stderr, "usage: %s \n", progname); 78 | fprintf(stderr, "Options:\n" 79 | "\t-l : Switch on logarithmic response (default: off)\n" 80 | "\t-i : network interface, such as eth0, wlan0. " 81 | "Default eth0\n" 82 | "\t-G : PixelPusher group (default: 0)\n" 83 | "\t-C : PixelPusher controller (default: 0)\n" 84 | "\t-a : if used with artnet bridge. Default 0,0\n" 85 | "\t-u : Max UDP data/packet (default %d)\n" 86 | "\t Best use the maximum that works with your network (up to %d).\n" 87 | "\t-d : Same as --led-daemon. Use this when starting in init scripts.\n", 88 | kDefaultUDPPacketSize, kMaxUDPPacketSize); 89 | 90 | rgb_matrix::PrintMatrixFlags(stderr); 91 | 92 | return 1; 93 | } 94 | 95 | int main(int argc, char *argv[]) { 96 | pp::PPOptions pp_options; 97 | pp_options.is_logarithmic = false; 98 | pp_options.artnet_universe = -1; 99 | pp_options.artnet_channel = -1; 100 | pp_options.network_interface = "eth0"; 101 | 102 | bool ushape_display = false; // 64x64 103 | const char* rotation = NULL; 104 | 105 | RGBMatrix::Options matrix_options; 106 | matrix_options.rows = 32; 107 | matrix_options.chain_length = 1; 108 | matrix_options.parallel = 1; 109 | rgb_matrix::RuntimeOptions runtime_opt; 110 | if (!ParseOptionsFromFlags(&argc, &argv, &matrix_options, &runtime_opt)) { 111 | return usage(argv[0]); 112 | } 113 | 114 | int opt; 115 | while ((opt = getopt(argc, argv, "dlLP:c:r:p:i:u:a:R:UG:C:")) != -1) { 116 | switch (opt) { 117 | case 'd': 118 | runtime_opt.daemon = 1; 119 | break; 120 | case 'l': 121 | pp_options.is_logarithmic = true; 122 | break; 123 | case 'L': // Hidden option; used to be a specialized -U 124 | fprintf(stderr, "-L is deprecated. use\n\t--led-pixel-mapper=\"U-mapper;Rotate:180\" --led-chain=4\ninstead\n"); 125 | matrix_options.rows = 32; 126 | matrix_options.chain_length = 4; 127 | rotation = "180"; // This is what the old transformer did. 128 | ushape_display = true; 129 | break; 130 | case 'U': // Hidden option; use --led-pixel-mapper instead 131 | fprintf(stderr, "-U is deprecated. Use --led-pixel-mapper=\"U-mapper\" " 132 | "instead\n"); 133 | ushape_display = true; 134 | break; 135 | case 'R': // Hidden option: use --led-pixel-mapper instead 136 | fprintf(stderr, "-R is deprecated. Use --led-pixel-mapper=\"Rotate:%s\" " 137 | "instead\n", optarg); 138 | rotation = strdup(optarg); 139 | break; 140 | case 'P': 141 | matrix_options.parallel = atoi(optarg); 142 | break; 143 | case 'c': 144 | matrix_options.chain_length = atoi(optarg); 145 | break; 146 | case 'r': 147 | matrix_options.rows = atoi(optarg); 148 | break; 149 | case 'p': 150 | matrix_options.pwm_bits = atoi(optarg); 151 | break; 152 | case 'i': 153 | pp_options.network_interface = strdup(optarg); 154 | break; 155 | case 'u': 156 | pp_options.udp_packet_size = atoi(optarg); 157 | break; 158 | case 'G': 159 | pp_options.group = atoi(optarg); 160 | break; 161 | case 'C': 162 | pp_options.controller = atoi(optarg); 163 | break; 164 | case 'a': 165 | if (2 != sscanf(optarg, "%d,%d", 166 | &pp_options.artnet_universe, &pp_options.artnet_channel)) { 167 | fprintf(stderr, "Artnet parameters must be ,\n"); 168 | return 1; 169 | } 170 | break; 171 | default: 172 | return usage(argv[0]); 173 | } 174 | } 175 | 176 | // Support for deprecated rotation options. 177 | std::string pixel_map_config; 178 | if (matrix_options.pixel_mapper_config) 179 | pixel_map_config.append(matrix_options.pixel_mapper_config); 180 | if (ushape_display) { 181 | pixel_map_config.insert(0, "U-mapper;"); 182 | matrix_options.pixel_mapper_config = pixel_map_config.c_str(); 183 | } 184 | if (rotation) { 185 | pixel_map_config.append(";").append("Rotate:").append(rotation); 186 | matrix_options.pixel_mapper_config = pixel_map_config.c_str(); 187 | } 188 | 189 | // Some parameter checks. 190 | if (getuid() != 0) { 191 | fprintf(stderr, "Must run as root to be able to access /dev/mem\n" 192 | "Prepend 'sudo' to the command:\n\tsudo %s ...\n", argv[0]); 193 | return 1; 194 | } 195 | 196 | RGBMatrix *matrix = CreateMatrixFromOptions(matrix_options, runtime_opt); 197 | matrix->set_luminance_correct(pp_options.is_logarithmic); 198 | 199 | RGBMatrixDevice device(matrix); 200 | if (!pp::StartPixelPusherServer(pp_options, &device)) { 201 | return 1; 202 | } 203 | 204 | if (runtime_opt.daemon == 1) { 205 | for(;;) sleep(INT_MAX); 206 | } else { 207 | printf("Press to shut down (supply -d option to run as daemon)\n"); 208 | getchar(); // for now, run until 209 | printf("shutting down\n"); 210 | } 211 | 212 | pp::ShutdownPixelPusherServer(); 213 | 214 | return 0; 215 | } 216 | --------------------------------------------------------------------------------