Add frdm-mcxw71 support

tutorials/nxp/frdm-rw612/eth_radio_bridge/main.c

@@ -0,0 +1,101 @@
+// Copyright (c) 2026 Cesanta Software Limited
+// All rights reserved
+//
+// Ethernet <-> IEEE 802.15.4 radio bridge. Radio frames carry Ethernet frames
+// split into pieces, see mg_l2_802154_tx(). Radio nodes, e.g. the
+// FRDM-MCXW71 minimal tutorial, are on the Ethernet LAN: they get IPv4
+// addresses from its DHCP server. The bridge itself has no IP address.
+// Everything from the radio goes to Ethernet. From Ethernet, only broadcasts
+// and frames to radio nodes go to the radio, it is much slower
+
+#include "hal.h"
+#include "mongoose.h"
+
+#define UART_DEBUG USART3
+
+static void log_fn(char ch, void *param) {
+  hal_uart_write_buf(param, &ch, 1);
+}
+
+uint64_t mg_millis(void) {
+  return hal_get_tick();
+}
+
+// MAC addresses of radio nodes, learned from frames they send
+static uint8_t s_nodes[8][6];
+static size_t s_next;
+
+// Remember a radio node's MAC address, if new
+static void learn(const uint8_t *mac) {
+  size_t i, n = sizeof(s_nodes) / sizeof(s_nodes[0]);
+  for (i = 0; i < n && memcmp(s_nodes[i], mac, 6) != 0; i++) (void) 0;
+  if (i < n) return;
+  memcpy(s_nodes[s_next], mac, 6);
+  s_next = (s_next + 1) % n;
+  MG_INFO(("Radio node %M", mg_print_mac, mac));
+}
+
+// Is an Ethernet frame for the radio: broadcast, or to a radio node
+static bool for_radio(const uint8_t *dst) {
+  size_t i, n = sizeof(s_nodes) / sizeof(s_nodes[0]);
+  if (memcmp(dst, "\xff\xff\xff\xff\xff\xff", 6) == 0) return true;
+  for (i = 0; i < n && memcmp(s_nodes[i], dst, 6) != 0; i++) (void) 0;
+  return i < n;
+}
+
+int main(void) {
+  static struct mg_tcpip_driver_rw612_data eth_data = {
+      .mdc_cr = MG_DRIVER_MDC_CR, .phy_addr = MG_TCPIP_PHY_ADDR};
+  static struct mg_l2_802154_data radio_data = {
+      .channel = MG_L2_802154_CHANNEL, .pan_id = MG_L2_802154_PAN_ID};
+  static struct mg_tcpip_if eth = {.driver = &mg_tcpip_driver_rw612,
+                                   .driver_data = &eth_data};
+  static struct mg_tcpip_if radio = {.driver = &mg_tcpip_driver_rw612_154,
+                                     .driver_data = &radio_data};
+  static char eth_queue[8192];  // Filled by the Ethernet IRQ handler
+  static uint8_t frame[1540];
+  uint8_t uid[FSL_OCOTP_UID_LENGTH], digest[32];
+  uint32_t uid_len = sizeof(uid);
+  uint64_t timer = 0;
+  char *p;
+  size_t n;
+
+  hal_clock_init();
+  hal_uart_init(UART_DEBUG, 115200);
+  mg_log_set_fn(log_fn, UART_DEBUG);
+  if (hal_radio_err) {
+    MG_ERROR(("Radio firmware failed to start, step %d", hal_radio_err));
+  }
+
+  // MAC addresses made from the chip unique ID
+  memset(uid, 0, sizeof(uid));
+  OCOTP_ReadUniqueID(uid, &uid_len);
+  mg_sha256(digest, uid, sizeof(uid));
+  memcpy(eth.mac, digest, 6);
+  memcpy(radio.mac, digest + 6, 6);
+  eth.mac[0] = radio.mac[0] = 0x02;  // Locally administered, unicast
+
+  hal_ethernet_init();
+  mg_queue_init(&eth.recv_queue, eth_queue, sizeof(eth_queue));
+  if (!eth.driver->init(&eth)) MG_ERROR(("Ethernet init failed"));
+  if (!radio.driver->init(&radio)) MG_ERROR(("Radio init failed"));
+  ENET->RCR |= ENET_RCR_PROM_MASK;  // Receive frames for radio nodes, too
+  MG_INFO(("Bridge started, radio channel %d", radio_data.channel));
+
+  for (;;) {
+    if ((n = mg_queue_next(&eth.recv_queue, &p)) > 0) {  // Ethernet -> radio
+      if (n >= 14 && for_radio((uint8_t *) p)) radio.driver->tx(p, n, &radio);
+      mg_queue_del(&eth.recv_queue, n);
+    }
+    if ((n = radio.driver->rx(frame, sizeof(frame), &radio)) >= 14) {
+      learn(frame + 6);  // Radio -> Ethernet
+      eth.driver->tx(frame, n, &eth);
+    }
+    if (mg_timer_expired(&timer, 1000, mg_millis())) {  // Ethernet link
+      bool up = eth.driver->poll(&eth, true);
+      eth.state = up ? MG_TCPIP_STATE_UP : MG_TCPIP_STATE_DOWN;
+    }
+  }
+
+  return 0;
+}