public NeoPixelSession Open()
{
var data = new ws2811_t
{
freq = Frequency,
dmanum = Dma,
channel = new ws2811_channel_t[2] {
new ws2811_channel_t {
gpionum = GpioPin,
count = _ledCount,
invert = Invert ? 1 : 0,
brightness = Brightness,
},
new ws2811_channel_t {
},
}
};
return new NeoPixelSession(data);
}
public WS281x(uint frequency, int dma,
int channel1LedCount, int channel1GpioPin, int channel1Brightness, bool channel1Inverted,
int channel2LedCount, int channel2GpioPin, int channel2Brightness, bool channel2Inverted)
{
if (!ValidChannel1Gpios.Contains(channel1GpioPin))
throw new ArgumentException(String.Format("Invalid GPIO Pin {0}, must be one of ({1})", channel1GpioPin, String.Join(", ", ValidChannel1Gpios)), nameof(channel1GpioPin));
if (!ValidChannel2Gpios.Contains(channel2GpioPin))
throw new ArgumentException(String.Format("Invalid GPIO Pin {0}, must be one of ({1})", channel2GpioPin, String.Join(", ", ValidChannel2Gpios)), nameof(channel2GpioPin));
_ws2811 = new ws2811_t
{
dmanum = 5,
channel = new ws2811_channel_t[RPI_PWM_CHANNELS],
freq = frequency
};
_ws2811.channel[1].brightness = 255;
_ws2811.dmanum = dma;
_ws2811.freq = frequency;
_ws2811.channel[0].count = channel1LedCount;
_ws2811.channel[0].gpionum = channel1GpioPin;
_ws2811.channel[0].brightness = channel1Brightness;
_ws2811.channel[0].invert = channel1Inverted ? 1 : 0;
_ws2811.channel[1].count = channel2LedCount;
_ws2811.channel[1].gpionum = channel2GpioPin;
_ws2811.channel[1].brightness = channel2Brightness;
_ws2811.channel[1].invert = channel2Inverted ? 1 : 0;
var res = ws2811_init(ref _ws2811);
if (res != 0)
{
throw new ExternalException("Error initializing rpi_ws281x", res);
}
Channel1 = new Led[_ws2811.channel[0].count];
Channel2 = new Led[_ws2811.channel[1].count];
}
public static extern int ws2811_init(ref ws2811_t ws2811);
static extern int ws2811_wait(ref ws2811_t ws2811);
static extern int ws2811_render(ref ws2811_t ws2811);
static extern void ws2811_fini(ref ws2811_t ws2811);
static extern int ws2811_init(ref ws2811_t ws2811);
internal NeoPixelSession(ws2811_t data)
{
_data = data;
// Have to be careful not to have a race condition here
// Maybe create the wrapper which will do the cleandown on finallise
// *before* the call to init?
var ret = NativeMethods.ws2811_init(ref _data);
if (ret != 0)
throw new Exception(string.Format("ws2811_init failed - returned {0}", ret));
}
