new examples

examples/esp32can_receive/esp32can_receive.ino

@@ -0,0 +1,27 @@
+#include <Arduino.h>
+#include <ESP32CAN.h>
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("ESP32-Arduino-CAN Receive Basic Demo");
+
+  ESP32Can.CANInit(GPIO_NUM_5, GPIO_NUM_4, ESP32CAN_SPEED_500KBPS);
+}
+
+void loop() {
+  twai_message_t rx_frame;
+  
+  ESP32Can.CANReadFrame(&rx_frame);
+
+  Serial.print(rx_frame.identifier, HEX);
+  Serial.print(" ");
+  Serial.print(rx_frame.data_length_code);
+  
+  for (int i=0; i<rx_frame.data_length_code; i++) {
+    Serial.print(rx_frame.data[i], HEX);
+  }
+
+  Serial.println();
+  
+  delay(1000);
+}