First init.

libraries/Adafruit_seesaw_Library/examples/LEDArcade_1x4/LEDArcade_1x4.ino

@@ -0,0 +1,96 @@
+/*
+ * This example shows how read arcade buttons and PWM the LEDs on the Adafruit Arcade QT!
+ */
+
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#define  DEFAULT_I2C_ADDR 0x3A
+
+#define  SWITCH1  18  // PA01
+#define  SWITCH2  19 // PA02
+#define  SWITCH3  20 // PA03
+#define  SWITCH4  2 // PA06
+#define  PWM1  12  // PC00
+#define  PWM2  13 // PC01
+#define  PWM3  0 // PA04
+#define  PWM4  1 // PA05
+
+
+Adafruit_seesaw ss;
+
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+
+  Serial.println(F("Adafruit PID 5296 I2C QT 4x LED Arcade Buttons test!"));
+  
+  if (!ss.begin(DEFAULT_I2C_ADDR)) {
+    Serial.println(F("seesaw not found!"));
+    while(1) delay(10);
+  }
+
+  uint16_t pid;
+  uint8_t year, mon, day;
+  
+  ss.getProdDatecode(&pid, &year, &mon, &day);
+  Serial.print("seesaw found PID: ");
+  Serial.print(pid);
+  Serial.print(" datecode: ");
+  Serial.print(2000+year); Serial.print("/"); 
+  Serial.print(mon); Serial.print("/"); 
+  Serial.println(day);
+
+  if (pid != 5296) {
+    Serial.println(F("Wrong seesaw PID"));
+    while (1) delay(10);
+  }
+
+  Serial.println(F("seesaw started OK!"));
+  ss.pinMode(SWITCH1, INPUT_PULLUP);
+  ss.pinMode(SWITCH2, INPUT_PULLUP);
+  ss.pinMode(SWITCH3, INPUT_PULLUP);
+  ss.pinMode(SWITCH4, INPUT_PULLUP);
+  ss.analogWrite(PWM1, 127);
+  ss.analogWrite(PWM2, 127);
+  ss.analogWrite(PWM3, 127);
+  ss.analogWrite(PWM4, 127);
+}
+
+uint8_t incr = 0;
+
+void loop() {
+  if (! ss.digitalRead(SWITCH1)) {
+    Serial.println("Switch 1 pressed");
+    ss.analogWrite(PWM1, incr);
+    incr += 5;
+  } else {
+    ss.analogWrite(PWM1, 0);
+  }
+  
+  if (! ss.digitalRead(SWITCH2)) {
+    Serial.println("Switch 2 pressed");
+    ss.analogWrite(PWM2, incr);
+    incr += 5;
+  } else {
+    ss.analogWrite(PWM2, 0);
+  }
+  
+  if (! ss.digitalRead(SWITCH3)) {
+    Serial.println("Switch 3 pressed");
+    ss.analogWrite(PWM3, incr);
+    incr += 5;
+  } else {
+    ss.analogWrite(PWM3, 0);
+  }
+  
+  if (! ss.digitalRead(SWITCH4)) {
+    Serial.println("Switch 4 pressed");
+    ss.analogWrite(PWM4, incr);
+    incr += 5;
+  } else {
+    ss.analogWrite(PWM4, 0);
+  }
+  delay(10);
+}