Rp2040 (#779)

Support x4 on each PIO

examples/RP2040/NeoPixel_RP2040_PioX4/NeoPixel_RP2040_PioX4.ino

@@ -0,0 +1,56 @@
+//
+// NeoPixel_RP2040_PioX4 - 
+// This sketch demonstrates the use of the PIO method allowing upto 4 instances
+// Per one of the two PIO channels
+// 
+// This example only works on the RP2040
+// 
+// The key part of the method name is Rp2040Pio1X4, 
+//    Rp2040 (platform specific method),
+//    PIO Channel 1 (most commonly available), 
+//    X4 (4 instances allowed)
+//
+// In this example, it demonstrates different ColorFeatures, Method specification, and count per strip
+//
+#include <NeoPixelBus.h>
+
+// Demonstrating the use of the four channels
+NeoPixelBus<NeoBgrFeature, NeoRp2040Pio1X4Ws2811Method> strip1(120, 15); // note: older WS2811 and longer strip
+NeoPixelBus<NeoGrbFeature, NeoRp2040Pio1X4Ws2812xMethod> strip2(100, 2); // note: modern WS2812 with letter like WS2812b
+NeoPixelBus<NeoGrbFeature, NeoRp2040Pio1X4Ws2812xInvertedMethod> strip3(100, 4); // note: inverted
+NeoPixelBus<NeoGrbwFeature, NeoRp2040Pio1X4Sk6812Method> strip4(50, 16); // note: RGBW and Sk6812 and smaller strip
+
+void setup() {
+    Serial.begin(115200);
+    while (!Serial); // wait for serial attach
+
+    Serial.println();
+    Serial.println("Initializing...");
+    Serial.flush();
+
+    // must call begin on all the strips
+    strip1.Begin();
+    strip2.Begin();
+    strip3.Begin();
+    strip4.Begin();
+
+    Serial.println();
+    Serial.println("Running...");
+}
+
+void loop() {
+    delay(1000);
+
+    // draw on the strips
+    strip1.SetPixelColor(0, RgbColor(255, 0, 0));      // red
+    strip2.SetPixelColor(0, RgbColor(0, 127, 0));      // green
+    strip3.SetPixelColor(0, RgbColor(0, 0, 53));       // blue
+    strip4.SetPixelColor(0, RgbwColor(0, 0, 128, 255)); // white channel with a little blue
+
+    // show them, 
+    // only on the last show, no matter the order, will the data be sent
+    strip1.Show();
+    strip2.Show();
+    strip3.Show();
+    strip4.Show();
+}