First init.

libraries/Adafruit_seesaw_Library/examples/NeoTrellis/pattern_game/pattern_game.ino

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+/* Small game for Adafruit NeoTrellis
+ * Works fine with smaller chips like Nano
+*/
+
+#include "Adafruit_NeoTrellis.h"
+
+Adafruit_NeoTrellis trellis;
+#define RED 0xFF00000
+#define GREEN 0x00FF000
+
+/*Defines the maximum difficulty (16 patterns in a row)*/
+#define MAX_DIFFICULTY 16
+
+int game_sequence[MAX_DIFFICULTY]  = {};
+int current_difficulty = 2;
+int cur = 0;
+
+//define a callback for key presses
+// Release event will trigger the game check
+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
+    // Check if the pressed button it correct
+    if (game_sequence[cur] == evt.bit.NUM){
+      flash(GREEN);
+      cur++;
+      if (cur == current_difficulty){
+        flash(GREEN);
+        flash(GREEN);
+        flash(GREEN);
+        cur = 0;
+        restart_game();
+      }
+    } else{
+      flash(RED);
+      cur = 0;
+      show_solution(game_sequence, current_difficulty);
+  
+    }
+    }
+
+  // Turn on/off the neopixels!
+  trellis.pixels.show();
+  return 0;
+}
+
+/*Increse difficulty and restart the game*/
+void restart_game(){
+  if (current_difficulty <= MAX_DIFFICULTY){
+    current_difficulty++;  
+  }
+  start_game(current_difficulty);
+}
+/*
+ * Flash all leds for a short time
+ */
+void flash(uint32_t color){
+  
+  for (uint16_t i=0; i<trellis.pixels.numPixels(); i++) {
+    trellis.pixels.setPixelColor(i, color);
+  }
+  trellis.pixels.show();
+  delay(200);
+  for (uint16_t i=0; i<trellis.pixels.numPixels(); i++) {
+  
+    trellis.pixels.setPixelColor(i, 0x000000);
+  }
+  trellis.pixels.show();
+
+}
+
+void setup() {
+  randomSeed(analogRead(0));
+  Serial.begin(9600);
+  //while(!Serial);
+  
+  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);
+  }
+  delay(50);
+  for (uint16_t i=0; i<trellis.pixels.numPixels(); i++) {
+  
+    trellis.pixels.setPixelColor(i, 0x000000);
+    trellis.pixels.show();
+    delay(50);
+  }
+  trellis.pixels.show();
+  
+  delay(1000);
+  start_game(current_difficulty);
+  
+}
+
+void start_game(int level){
+  for (int x = 0; x <= level; x++){
+    int led = random(trellis.pixels.numPixels());
+    game_sequence[x] = led;
+  }
+  show_solution(game_sequence, level);
+}
+
+void show_solution(int solution[], int level){
+  for (int x=0; x < level; x++){
+    int led = solution[x];
+    trellis.pixels.setPixelColor(led, Wheel(map(led, 0, trellis.pixels.numPixels(), 0, 255)));
+    trellis.pixels.show();
+    delay(500);
+    trellis.pixels.setPixelColor(led, 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;
+}