public LedMatrix(LedMatrixOptions options = null, string[] arguments = null)
{
options = options ?? new LedMatrixOptions();
var opt = new NativeLedMatrixOptions(options);
try
{
var nativeArguments = arguments.ConvertToNativeArguments(options);
_matrix = RpiRgbLedMatrix.led_matrix_create_from_options_const_argv(ref opt, nativeArguments.Length, nativeArguments);
}
finally
{
if (options.HardwareMapping != null)
{
opt.Free(ref opt.hardware_mapping);
}
if (options.LedRgbSequence != null)
{
opt.Free(ref opt.led_rgb_sequence);
}
if (options.PixelMapperConfig != null)
{
opt.Free(ref opt.pixel_mapper_config);
}
if (options.PanelType != null)
{
opt.Free(ref opt.panel_type);
}
}
}
public static string[] ConvertToNativeArguments(this string[] args, LedMatrixOptions options)
{
args = args ?? Environment.GetCommandLineArgs();
// Because gpio-slowdown is not provided in the options struct, we manually add it.
// Let's add it first to the command-line we pass to the
// matrix constructor, so that it can be overridden with the
// users' commandline.
// As always, as the _very_ first, we need to provide the
// program name argv[0], so this is why our slowdown_arg
// array will have these two elements.
//
// Given that we can't initialize the C# struct with a slowdown
// that is not 0, we just override it here with 1 if we see 0
// (zero only really is usable on super-slow vey old Rpi1,
// but for everyone else, it would be a nuisance. So we use
// 0 as our sentinel).
string[] slowdown_arg = new string[] { args[0], $"--led-slowdown-gpio={((options.GpioSlowdown == 0) ? 1 : options.GpioSlowdown)}" };
string[] argv = new string[2 + args.Length - 1];
// Progname + slowdown arg first
slowdown_arg.CopyTo(argv, 0);
// Remaining args (excluding program name) then. This allows
// the user to not only provide any of the other --led-*
// options, but also override the --led-slowdown-gpio arg on
// the commandline.
Array.Copy(args, 1, argv, 2, args.Length - 1);
return(argv);
}
