Initial Clock Format

rpi-rgb-led-matrix-master/examples-api-use/input-example.cc

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