add new example

examples/feather_m4can_neotran/feather_m4can_neotran.ino

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+/*
+ * Adafruit Feather M4 CAN Transceiver Example
+ */
+
+#include <CANSAME5x.h>
+#include <Adafruit_NeoPixel.h>
+
+CANSAME5x CAN;
+
+Adafruit_NeoPixel strip(1, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
+
+#define MY_PACKET_ID 0xAF
+
+uint32_t timestamp;
+
+void setup() {
+  Serial.begin(115200);
+  //while (!Serial) delay(10);
+
+  Serial.println("CAN NeoPixel Potentiometer RX/TX demo");
+
+  pinMode(PIN_CAN_STANDBY, OUTPUT);
+  digitalWrite(PIN_CAN_STANDBY, false); // turn off STANDBY
+  pinMode(PIN_CAN_BOOSTEN, OUTPUT);
+  digitalWrite(PIN_CAN_BOOSTEN, true); // turn on booster
+
+  strip.begin();
+  strip.setBrightness(50);
+
+  // start the CAN bus at 250 kbps
+  if (!CAN.begin(250000)) {
+    Serial.println("Starting CAN failed!");
+    while (1) delay(10);
+  }
+
+  timestamp = millis();
+}
+
+void loop() {
+  // every 100 ms send out a packet
+  if ((millis() - timestamp) > 100) {
+    uint16_t pot = analogRead(A5);
+    // send a packet with the potentiometer value  
+    Serial.print("Sending packet with value ");
+    Serial.print(pot);
+
+    CAN.beginPacket(MY_PACKET_ID);
+    CAN.write(pot >> 8);
+    CAN.write(pot & 0xFF);
+    CAN.endPacket();
+  
+    Serial.println("...sent!");
+    timestamp = millis();
+  }
+
+  // try to parse any incoming packet
+  int packetSize = CAN.parsePacket();
+
+  if (packetSize) {
+    // received a packet
+    Serial.print("Received ");
+
+    if (CAN.packetExtended()) {
+      Serial.print("extended ");
+    }
+
+    if (CAN.packetRtr()) {
+      // Remote transmission request, packet contains no data
+      Serial.print("RTR ");
+    }
+
+    Serial.print("packet with id 0x");
+    Serial.print(CAN.packetId(), HEX);
+
+    if (CAN.packetRtr()) {
+      Serial.print(" and requested length ");
+      Serial.println(CAN.packetDlc());
+    } else {
+      Serial.print(" and length ");
+      Serial.println(packetSize);
+
+      uint8_t receivedData[packetSize];
+      for (int i=0; i<packetSize; i++) {
+        receivedData[i] = CAN.read();
+        Serial.print("0x");
+        Serial.print(receivedData[i], HEX);
+        Serial.print(", ");
+      }
+      Serial.println();
+
+      uint16_t value = (uint16_t)receivedData[0] << 8 | receivedData[1];
+      strip.setPixelColor(0, Wheel(value / 4));
+      strip.show();
+    }
+
+    Serial.println();
+  }
+}
+
+uint32_t Wheel(byte WheelPos) {
+  WheelPos = 255 - WheelPos;
+  if(WheelPos < 85) {
+    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  }
+  if(WheelPos < 170) {
+    WheelPos -= 85;
+    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  WheelPos -= 170;
+  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+}