First init.

libraries/Adafruit_seesaw_Library/examples/encoder/PID5752_QuadEncoder_demo/PID5752_QuadEncoder_demo.ino

@@ -0,0 +1,111 @@
+/*
+ * This is a demo for a QT Py RP2040 connected to a quad rotary encoder breakout
+ * using the onboard Stemma QT Port
+ * https://www.adafruit.com/product/4900
+ * https://www.adafruit.com/product/5752
+ * 
+ */
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#define SS_NEO_PIN       18
+#define SS_ENC0_SWITCH   12
+#define SS_ENC1_SWITCH   14
+#define SS_ENC2_SWITCH   17
+#define SS_ENC3_SWITCH   9
+
+#define SEESAW_ADDR      0x49
+
+Adafruit_seesaw ss = Adafruit_seesaw(&Wire);
+seesaw_NeoPixel pixels = seesaw_NeoPixel(4, SS_NEO_PIN, NEO_GRB + NEO_KHZ800);
+
+int32_t enc_positions[4] = {0, 0, 0, 0};
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println("Looking for seesaw!");
+  
+  if (! ss.begin(SEESAW_ADDR) || !pixels.begin(SEESAW_ADDR)) {
+    Serial.println("Couldn't find seesaw on default address");
+    while(1) delay(10);
+  }
+  Serial.println("seesaw started");
+  uint32_t version = ((ss.getVersion() >> 16) & 0xFFFF);
+  if (version  != 5752){
+    Serial.print("Wrong firmware loaded? ");
+    Serial.println(version);
+    while(1) delay(10);
+  }
+  Serial.println("Found Product 5752");
+
+  ss.pinMode(SS_ENC0_SWITCH, INPUT_PULLUP);
+  ss.pinMode(SS_ENC1_SWITCH, INPUT_PULLUP);
+  ss.pinMode(SS_ENC2_SWITCH, INPUT_PULLUP);
+  ss.pinMode(SS_ENC3_SWITCH, INPUT_PULLUP);
+  ss.setGPIOInterrupts(1UL << SS_ENC0_SWITCH | 1UL << SS_ENC1_SWITCH | 
+                       1UL << SS_ENC2_SWITCH | 1UL << SS_ENC3_SWITCH, 1);
+
+  
+  // get starting positions
+  for (int e=0; e<4; e++) {
+    enc_positions[e] = ss.getEncoderPosition(e);
+    ss.enableEncoderInterrupt(e);
+  }
+  
+  Serial.println("Turning on interrupts");
+
+  pixels.setBrightness(255);
+  pixels.show(); // Initialize all pixels to 'off'
+}
+
+void loop() {
+
+  if (! ss.digitalRead(SS_ENC0_SWITCH)) {
+    Serial.println("ENC0 pressed!");
+  }
+  if (! ss.digitalRead(SS_ENC1_SWITCH)) {
+    Serial.println("ENC1 pressed!");
+  }
+  if (! ss.digitalRead(SS_ENC2_SWITCH)) {
+    Serial.println("ENC2 pressed!");
+  }
+  if (! ss.digitalRead(SS_ENC3_SWITCH)) {
+    Serial.println("ENC3 pressed!");
+  }
+
+
+  for (int e=0; e<4; e++) {
+    int32_t new_enc_position = ss.getEncoderPosition(e);
+    // did we move around?
+    if (enc_positions[e] != new_enc_position) {
+      Serial.print("Encoder #");
+      Serial.print(e);
+      Serial.print(" -> ");
+      Serial.println(new_enc_position);      // display new position
+      enc_positions[e] = new_enc_position;      // and save for next round
+      
+      // change the neopixel color, mulitply the new positiion by 4 to speed it up
+      pixels.setPixelColor(e, Wheel((new_enc_position*4) & 0xFF));
+      pixels.show();
+    }
+  }
+
+  // don't overwhelm serial port
+  delay(10);
+}
+
+
+uint32_t Wheel(byte WheelPos) {
+  WheelPos = 255 - WheelPos;
+  if (WheelPos < 85) {
+    return seesaw_NeoPixel::Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  }
+  if (WheelPos < 170) {
+    WheelPos -= 85;
+    return seesaw_NeoPixel::Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  WheelPos -= 170;
+  return seesaw_NeoPixel::Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+}