First init.

libraries/Adafruit_seesaw_Library/examples/NeoKey_1x4/basic_neoswirl/basic_neoswirl.ino

@@ -0,0 +1,86 @@
+#include "Adafruit_NeoKey_1x4.h"
+#include "seesaw_neopixel.h"
+
+Adafruit_NeoKey_1x4 neokey;
+
+void setup() {
+  Serial.begin(115200);
+  while (! Serial) delay(10);
+   
+  if (! neokey.begin(0x30)) {
+    Serial.println("Could not start NeoKey, check wiring?");
+    while(1) delay(10);
+  }
+  
+  Serial.println("NeoKey started!");
+
+  for (uint16_t i=0; i<neokey.pixels.numPixels(); i++) {
+    neokey.pixels.setPixelColor(i, Wheel(map(i, 0, neokey.pixels.numPixels(), 0, 255)));
+    neokey.pixels.show();
+    delay(50);
+  }
+  for (uint16_t i=0; i<neokey.pixels.numPixels(); i++) {
+    neokey.pixels.setPixelColor(i, 0x000000);
+    neokey.pixels.show();
+    delay(50);
+  }
+}
+
+uint8_t j=0;  // this variable tracks the colors of the LEDs cycle.
+
+void loop() {
+  uint8_t buttons = neokey.read();
+
+  
+  for (int i=0; i< neokey.pixels.numPixels(); i++) {
+    neokey.pixels.setPixelColor(i, Wheel(((i * 256 / neokey.pixels.numPixels()) + j) & 255));
+  }  
+  
+  if (buttons & (1<<0)) {
+    Serial.println("Button A");
+  } else {
+    neokey.pixels.setPixelColor(0, 0);
+  }
+
+  if (buttons & (1<<1)) {
+    Serial.println("Button B");
+  } else {
+    neokey.pixels.setPixelColor(1, 0);
+  }
+  
+  if (buttons & (1<<2)) {
+    Serial.println("Button C");
+  } else {
+    neokey.pixels.setPixelColor(2, 0);
+  }
+
+  if (buttons & (1<<3)) {
+    Serial.println("Button D");
+  } else {
+    neokey.pixels.setPixelColor(3, 0);
+  }  
+
+  neokey.pixels.show();
+  
+  delay(10);    // don't print too fast
+  j++;          // make colors cycle
+}
+
+
+
+/******************************************/
+
+// Input a value 0 to 255 to get a color value.
+// The colors are a transition r - g - b - back to r.
+uint32_t Wheel(byte WheelPos) {
+  if(WheelPos < 85) {
+   return seesaw_NeoPixel::Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+  } else if(WheelPos < 170) {
+   WheelPos -= 85;
+   return seesaw_NeoPixel::Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  } else {
+   WheelPos -= 170;
+   return seesaw_NeoPixel::Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  return 0;
+}