You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// -*- 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;
|
|
}
|