First init.

libraries/Adafruit_seesaw_Library/examples/digital/attiny_blink/attiny_blink.ino

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+/*
+ * This example shows how to blink a pin on a seesaw.
+ * It is written to use the built-in LED on the ATtiny817 breakout with seesaw.
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+#define BLINK_PIN 5
+
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+  
+  if(!ss.begin()){
+    Serial.println("seesaw not found!");
+    while(1) delay(10);
+  }
+  
+  Serial.println(F("seesaw started OK!"));
+
+  ss.pinMode(BLINK_PIN, OUTPUT);
+}
+
+void loop() {
+  ss.digitalWrite(BLINK_PIN, LOW);   // turn the LED on (the LED is tied low)
+  delay(1000);                       // wait for a second
+  ss.digitalWrite(BLINK_PIN, HIGH);    // turn the LED off
+  delay(1000);  
+}

libraries/Adafruit_seesaw_Library/examples/digital/blink/blink.ino

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+/*
+ * This example shows how to blink a pin on a seesaw.
+ * Attach the positive (longer lead) of the LED to pin 15 on the seesaw, and
+ * the negative lead of the LED to ground through a 1k ohm resistor.
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+#define BLINK_PIN 15
+
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+  
+  if(!ss.begin()){
+    Serial.println("seesaw not found!");
+    while(1) delay(10);
+  }
+  
+  Serial.println(F("seesaw started OK!"));
+
+  ss.pinMode(BLINK_PIN, OUTPUT);
+}
+
+void loop() {
+  ss.digitalWrite(BLINK_PIN, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(100);                       // wait for a second
+  ss.digitalWrite(BLINK_PIN, LOW);    // turn the LED off by making the voltage LOW
+  delay(100);  
+}

libraries/Adafruit_seesaw_Library/examples/digital/gpio_interrupts/gpio_interrupts.ino

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+/*
+ * This example shows how set GPIO interrupts on a seesaw.
+ */
+
+#include "Adafruit_seesaw.h"
+
+//connect the interrupt pin on the seesaw (pin 8 on samd09 breakout) to this pin on your arduino
+#define INT_PIN 3
+
+//the interrupt will fire when this pin on the seesaw changes state 
+#define SCAN_PIN 9
+
+Adafruit_seesaw ss;
+
+uint32_t mask = ((uint32_t)0b1 << SCAN_PIN);
+
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+  
+  if(!ss.begin()){
+    Serial.println(F("seesaw not found!"));
+    while(1) delay(10);
+  }
+  
+  Serial.println(F("seesaw started OK!"));
+
+  pinMode(INT_PIN, INPUT_PULLUP);
+  ss.pinModeBulk(mask, INPUT_PULLUP);
+  ss.setGPIOInterrupts(mask, 1);
+}
+
+void loop() {
+  if(!digitalRead(INT_PIN)){
+    Serial.print(F("Interrupt fired! pin state: "));
+    Serial.println(ss.digitalRead(SCAN_PIN));
+  }
+}

libraries/Adafruit_seesaw_Library/examples/digital/multiblink/multiblink.ino

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+/*
+ * This example shows how to blink multiple pins at once on a seesaw.
+ * pin 13 is attached to the LED on the samd11 xplained board
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+//blink pins PA11, PA12, PA13
+uint32_t mask = ((uint32_t)0b111 << 11);
+
+void setup() {
+  Serial.begin(115200);
+  
+  if(!ss.begin()){
+    Serial.println("ERROR!");
+    while(1) delay(1);
+  }
+  else Serial.println("seesaw started");
+
+  ss.pinModeBulk(mask, OUTPUT); //set pin modes
+}
+
+void loop() {
+  ss.digitalWriteBulk(mask, HIGH);   //set pins
+  delay(1000);                       // wait for a second
+  ss.digitalWriteBulk(mask, LOW);   //clear pins
+  delay(1000);  
+}

libraries/Adafruit_seesaw_Library/examples/digital/multiread/multiread.ino

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+/*
+ * This example shows how to read multiple pins at once on a seesaw.
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+//read pins A8, A9, A10
+uint32_t mask = ((uint32_t)0b111 << 8);
+
+void setup() {
+  Serial.begin(9600);
+  
+  if(!ss.begin()){
+    Serial.println("ERROR!");
+    while(1) delay(1);
+  }
+  else Serial.println("seesaw started");
+  
+  ss.pinModeBulk(mask, INPUT);
+}
+
+void loop() {
+  Serial.println(ss.digitalReadBulk(mask), BIN);
+  delay(500);
+}