Enable ETH over Arduino SPI and add example

libraries/Ethernet/examples/ETH_W5500_Arduino_SPI/ETH_W5500_Arduino_SPI.ino

@@ -0,0 +1,110 @@
+/*
+    This sketch shows the Ethernet event usage
+
+*/
+
+#include <ETH.h>
+#include <SPI.h>
+
+// Set this to 1 to enable dual Ethernet support
+#define USE_TWO_ETH_PORTS 0
+
+#define ETH_TYPE        ETH_PHY_W5500
+#define ETH_ADDR         1
+#define ETH_CS          15
+#define ETH_IRQ          4
+#define ETH_RST          5
+
+// SPI pins
+#define ETH_SPI_SCK     14
+#define ETH_SPI_MISO    12
+#define ETH_SPI_MOSI    13
+
+#if USE_TWO_ETH_PORTS
+// Second port on shared SPI bus
+#define ETH1_TYPE        ETH_PHY_W5500
+#define ETH1_ADDR         1
+#define ETH1_CS          32
+#define ETH1_IRQ         33
+#define ETH1_RST         18
+ETHClass ETH1(1);
+#endif
+
+static bool eth_connected = false;
+
+void onEvent(arduino_event_id_t event, arduino_event_info_t info)
+{
+  switch (event) {
+    case ARDUINO_EVENT_ETH_START:
+      Serial.println("ETH Started");
+      //set eth hostname here
+      ETH.setHostname("esp32-eth0");
+      break;
+    case ARDUINO_EVENT_ETH_CONNECTED:
+      Serial.println("ETH Connected");
+      break;
+    case ARDUINO_EVENT_ETH_GOT_IP:
+      Serial.printf("ETH Got IP: '%s'\n", esp_netif_get_desc(info.got_ip.esp_netif));
+      ETH.printInfo(Serial);
+#if USE_TWO_ETH_PORTS
+      ETH1.printInfo(Serial);
+#endif
+      eth_connected = true;
+      break;
+    case ARDUINO_EVENT_ETH_LOST_IP:
+      Serial.println("ETH Lost IP");
+      eth_connected = false;
+      break;
+    case ARDUINO_EVENT_ETH_DISCONNECTED:
+      Serial.println("ETH Disconnected");
+      eth_connected = false;
+      break;
+    case ARDUINO_EVENT_ETH_STOP:
+      Serial.println("ETH Stopped");
+      eth_connected = false;
+      break;
+    default:
+      break;
+  }
+}
+
+void testClient(const char * host, uint16_t port)
+{
+  Serial.print("\nconnecting to ");
+  Serial.println(host);
+
+  WiFiClient client;
+  if (!client.connect(host, port)) {
+    Serial.println("connection failed");
+    return;
+  }
+  client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
+  while (client.connected() && !client.available());
+  while (client.available()) {
+    Serial.write(client.read());
+  }
+
+  Serial.println("closing connection\n");
+  client.stop();
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  WiFi.onEvent(onEvent);
+
+  SPI.begin(ETH_SPI_SCK, ETH_SPI_MISO, ETH_SPI_MOSI);
+  ETH.begin(ETH_TYPE, ETH_ADDR, ETH_CS, ETH_IRQ, ETH_RST, SPI);
+#if USE_TWO_ETH_PORTS
+  ETH1.begin(ETH1_TYPE, ETH1_ADDR, ETH1_CS, ETH1_IRQ, ETH1_RST, SPI);
+#endif
+}
+
+
+void loop()
+{
+  if (eth_connected) {
+    testClient("google.com", 80);
+  }
+  delay(10000);
+}

libraries/Ethernet/src/ETH.h

@@ -61,7 +61,7 @@
 // #define ETH_PHY_SPI         SPI
 
 // This will be uncommented once custom SPI support is available in ESP-IDF
-#define ETH_SPI_SUPPORTS_CUSTOM 0
+#define ETH_SPI_SUPPORTS_CUSTOM 1
 
 #include "WiFi.h"
 #if ETH_SPI_SUPPORTS_CUSTOM