Add RMII example

examples/rp2040/pico-rmii/main.c

@@ -0,0 +1,55 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+
+#include "pico/stdlib.h"
+#include "hardware/clocks.h"
+
+#include "mongoose.h"
+
+#include "driver_rp2040_rmii.h"
+
+#define CLKREFPIN 20  // either 20 or 22
+
+static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    mg_http_reply(c, 200, "", "ok\n");
+  }
+}
+
+
+int main(void) {
+  // use the RMII reference clock (50MHz) as our system clock
+  clock_configure_gpin(clk_sys, CLKREFPIN, 50 * MHZ, 50 * MHZ);
+  sleep_ms(100);
+  stdio_init_all();
+
+  struct mg_mgr mgr;        // Initialise Mongoose event manager
+  mg_mgr_init(&mgr);        // and attach it to the MIP interface
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+
+  MG_INFO(("Init MIP"));
+  // Initialise Mongoose network stack and specific driver
+  // Set consecutive GPIOs for RMII (tx and rx) and SMI function groups
+  struct mip_driver_rp2040_rmii_data driver_data = {
+      // see driver_rp2040_rmii.h
+      .rx0 = 6,      // 6, 7, 8     : RX0, RX1, CRS_DV
+      .tx0 = 10,     // 10, 11, 12  : TX0, TX1, TX-EN
+      .mdio = 14,    // 14, 15      : MDIO, MDC
+      .phy_addr = 1  // check your hardware, LAN8722 is 0 or 1
+  };
+  // Specify MAC address, either set use_dhcp or enter a static config.
+  // For static configuration, specify IP/mask/GW in network byte order
+  struct mip_if mif = {
+      .mac = {2, 0, 1, 2, 3, 5},
+      .ip = 0,
+      .driver = &mip_driver_rp2040_rmii,
+      .driver_data = &driver_data,
+  };
+  mip_init(&mgr, &mif);
+  mg_http_listen(&mgr, "http://0.0.0.0", fn, NULL);  // HTTP listener
+  MG_INFO(("Init done, starting main loop"));
+
+  for (;;) mg_mgr_poll(&mgr, 0);  // Infinite event loop
+
+  return 0;
+}