First init.

libraries/Adafruit_seesaw_Library/examples/NeoTrellis/basic/basic.ino

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+/* This example shows basic usage of the NeoTrellis.
+  The buttons will light up various colors when pressed.
+  The interrupt pin is not used in this example.
+*/
+
+#include "Adafruit_NeoTrellis.h"
+
+Adafruit_NeoTrellis trellis;
+
+//define a callback for key presses
+TrellisCallback blink(keyEvent evt){
+  // Check is the pad pressed?
+  if (evt.bit.EDGE == SEESAW_KEYPAD_EDGE_RISING) {
+    trellis.pixels.setPixelColor(evt.bit.NUM, Wheel(map(evt.bit.NUM, 0, trellis.pixels.numPixels(), 0, 255))); //on rising
+  } else if (evt.bit.EDGE == SEESAW_KEYPAD_EDGE_FALLING) {
+  // or is the pad released?
+    trellis.pixels.setPixelColor(evt.bit.NUM, 0); //off falling
+  }
+
+  // Turn on/off the neopixels!
+  trellis.pixels.show();
+
+  return 0;
+}
+
+void setup() {
+  Serial.begin(9600);
+  // while(!Serial) delay(1);
+  
+  if (!trellis.begin()) {
+    Serial.println("Could not start trellis, check wiring?");
+    while(1) delay(1);
+  } else {
+    Serial.println("NeoPixel Trellis started");
+  }
+
+  //activate all keys and set callbacks
+  for(int i=0; i<NEO_TRELLIS_NUM_KEYS; i++){
+    trellis.activateKey(i, SEESAW_KEYPAD_EDGE_RISING);
+    trellis.activateKey(i, SEESAW_KEYPAD_EDGE_FALLING);
+    trellis.registerCallback(i, blink);
+  }
+
+  //do a little animation to show we're on
+  for (uint16_t i=0; i<trellis.pixels.numPixels(); i++) {
+    trellis.pixels.setPixelColor(i, Wheel(map(i, 0, trellis.pixels.numPixels(), 0, 255)));
+    trellis.pixels.show();
+    delay(50);
+  }
+  for (uint16_t i=0; i<trellis.pixels.numPixels(); i++) {
+    trellis.pixels.setPixelColor(i, 0x000000);
+    trellis.pixels.show();
+    delay(50);
+  }
+}
+
+void loop() {
+  trellis.read();  // interrupt management does all the work! :)
+  
+  delay(20); //the trellis has a resolution of around 60hz
+}
+
+
+/******************************************/
+
+// 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 trellis.pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+  } else if(WheelPos < 170) {
+   WheelPos -= 85;
+   return trellis.pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  } else {
+   WheelPos -= 170;
+   return trellis.pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  return 0;
+}