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65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
1 year ago
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// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Small example how to use the input bits
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//
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// This code is public domain
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// (but note, that the led-matrix library this depends on is GPL v2)
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#include "led-matrix.h"
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#include <unistd.h>
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#include <math.h>
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#include <stdio.h>
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#include <signal.h>
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using rgb_matrix::RGBMatrix;
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using rgb_matrix::Canvas;
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volatile bool interrupt_received = false;
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static void InterruptHandler(int signo) {
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interrupt_received = true;
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}
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int main(int argc, char *argv[]) {
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RGBMatrix::Options defaults;
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defaults.hardware_mapping = "regular"; // or e.g. "adafruit-hat"
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defaults.rows = 32;
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defaults.chain_length = 1;
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defaults.parallel = 1;
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RGBMatrix *matrix = RGBMatrix::CreateFromFlags(&argc, &argv, &defaults);
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if (matrix == NULL)
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return 1;
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// It is always good to set up a signal handler to cleanly exit when we
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// receive a CTRL-C for instance.
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signal(SIGTERM, InterruptHandler);
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signal(SIGINT, InterruptHandler);
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// Let's request all input bits and see which are actually available.
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// This will differ depending on which hardware mapping you use and how
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// many parallel chains you have.
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const uint64_t available_inputs = matrix->RequestInputs(0xffffffff);
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fprintf(stderr, "Available GPIO-bits: ");
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for (int b = 0; b < 32; ++b) {
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if (available_inputs & (1<<b))
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fprintf(stderr, "%d ", b);
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}
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fprintf(stderr, "\n");
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while (!interrupt_received) {
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// Block and wait until any input bit changed or 100ms passed
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uint32_t inputs = matrix->AwaitInputChange(100);
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// Minimal output: let's show the bits with LEDs in the first row
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for (int b = 0; b < 32; ++b) {
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uint8_t col = (inputs & (1<<b)) ? 255 : 0;
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matrix->SetPixel(32-b, 0, col, col, col);
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}
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}
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fprintf(stderr, "Exiting.\n");
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matrix->Clear();
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delete matrix;
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return 0;
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}
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