First init.

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

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+/* This example shows basic usage of the
+MultiTrellis object controlling an array of
+NeoTrellis boards
+
+As is this example shows use of two NeoTrellis boards
+connected together with the leftmost board having the
+default I2C address of 0x2E, and the rightmost board
+having the address of 0x2F (the A0 jumper is soldered)
+*/
+
+#include "Adafruit_NeoTrellis.h"
+
+#define Y_DIM 4 //number of rows of key
+#define X_DIM 8 //number of columns of keys
+
+//create a matrix of trellis panels
+Adafruit_NeoTrellis t_array[Y_DIM/4][X_DIM/4] = {
+  
+  { Adafruit_NeoTrellis(0x2E), Adafruit_NeoTrellis(0x2F) }
+  
+};
+
+/*
+If you were using a 2x2 array of NeoTrellis boards, the above lines would be:
+
+#define Y_DIM 8 //number of rows of key
+#define X_DIM 8 //number of columns of keys
+
+//create a matrix of trellis panels
+Adafruit_NeoTrellis t_array[Y_DIM/4][X_DIM/4] = {
+  
+  { Adafruit_NeoTrellis(0x2E), Adafruit_NeoTrellis(0x2F) },
+
+  { Adafruit_NeoTrellis(LOWER_LEFT_I2C_ADDR), Adafruit_NeoTrellis(LOWER_RIGHT_I2C_ADDR) }
+  
+};
+*/
+
+//pass this matrix to the multitrellis object
+Adafruit_MultiTrellis trellis((Adafruit_NeoTrellis *)t_array, Y_DIM/4, X_DIM/4);
+
+// 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;
+}
+
+//define a callback for key presses
+TrellisCallback blink(keyEvent evt){
+  
+  if(evt.bit.EDGE == SEESAW_KEYPAD_EDGE_RISING)
+    trellis.setPixelColor(evt.bit.NUM, Wheel(map(evt.bit.NUM, 0, X_DIM*Y_DIM, 0, 255))); //on rising
+  else if(evt.bit.EDGE == SEESAW_KEYPAD_EDGE_FALLING)
+    trellis.setPixelColor(evt.bit.NUM, 0); //off falling
+    
+  trellis.show();
+  return 0;
+}
+
+void setup() {
+  Serial.begin(9600);
+  //while(!Serial) delay(1);
+
+  if(!trellis.begin()){
+    Serial.println("failed to begin trellis");
+    while(1) delay(1);
+  }
+
+  /* the array can be addressed as x,y or with the key number */
+  for(int i=0; i<Y_DIM*X_DIM; i++){
+      trellis.setPixelColor(i, Wheel(map(i, 0, X_DIM*Y_DIM, 0, 255))); //addressed with keynum
+      trellis.show();
+      delay(50);
+  }
+  
+  for(int y=0; y<Y_DIM; y++){
+    for(int x=0; x<X_DIM; x++){
+      //activate rising and falling edges on all keys
+      trellis.activateKey(x, y, SEESAW_KEYPAD_EDGE_RISING, true);
+      trellis.activateKey(x, y, SEESAW_KEYPAD_EDGE_FALLING, true);
+      trellis.registerCallback(x, y, blink);
+      trellis.setPixelColor(x, y, 0x000000); //addressed with x,y
+      trellis.show(); //show all LEDs
+      delay(50);
+    }
+  }
+
+}
+
+void loop() {
+  trellis.read();
+  delay(20);
+}