From bb944729f2ad39f2e497505e4562e0fd1e836f23 Mon Sep 17 00:00:00 2001
From: HiFiPhile <admin@hifiphile.com>
Date: Sun, 28 Dec 2025 16:43:09 +0100
Subject: [PATCH] example/net: add led blink task

Signed-off-by: HiFiPhile <admin@hifiphile.com>
---
 examples/device/net_lwip_webserver/src/main.c | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/examples/device/net_lwip_webserver/src/main.c b/examples/device/net_lwip_webserver/src/main.c
index 867cf2812..3fb852cb3 100644
--- a/examples/device/net_lwip_webserver/src/main.c
+++ b/examples/device/net_lwip_webserver/src/main.c
@@ -67,6 +67,19 @@ try changing the first byte of tud_network_mac_address[] below from 0x02 to 0x00
 #define INIT_IP4(a, b, c, d) \
   { PP_HTONL(LWIP_MAKEU32(a, b, c, d)) }
 
+/* Blink pattern
+ * - 250 ms  : device not mounted
+ * - 1000 ms : device mounted
+ * - 2500 ms : device is suspended
+ */
+enum {
+  BLINK_NOT_MOUNTED = 250,
+  BLINK_MOUNTED = 1000,
+  BLINK_SUSPENDED = 2500,
+};
+
+static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
+
 /* lwip context */
 static struct netif netif_data;
 
@@ -218,6 +231,20 @@ uint16_t tud_network_xmit_cb(uint8_t *dst, void *ref, uint16_t arg) {
   return pbuf_copy_partial(p, dst, p->tot_len, 0);
 }
 
+static void led_blinking_task(void) {
+  static uint32_t start_ms = 0;
+  static bool led_state = false;
+
+  // Blink every interval ms
+  if (board_millis() - start_ms < blink_interval_ms) {
+    return; // not enough time
+  }
+  start_ms += blink_interval_ms;
+
+  board_led_write(led_state);
+  led_state = 1 - led_state; // toggle
+}
+
 static void handle_link_state_switch(void) {
   /* Check for button press to toggle link state */
   static bool last_link_state = true;
@@ -275,11 +302,35 @@ int main(void) {
     tud_task();
     sys_check_timeouts(); // service lwip
     handle_link_state_switch();
+    led_blinking_task();
   }
 
   return 0;
 }
 
+// Invoked when device is mounted
+void tud_mount_cb(void) {
+  blink_interval_ms = BLINK_MOUNTED;
+}
+
+// Invoked when device is unmounted
+void tud_umount_cb(void) {
+  blink_interval_ms = BLINK_NOT_MOUNTED;
+}
+
+// Invoked when usb bus is suspended
+// remote_wakeup_en : if host allow us to perform remote wakeup
+// Within 7ms, device must draw an average of current less than 2.5 mA from bus
+void tud_suspend_cb(bool remote_wakeup_en) {
+  (void) remote_wakeup_en;
+  blink_interval_ms = BLINK_SUSPENDED;
+}
+
+// Invoked when usb bus is resumed
+void tud_resume_cb(void) {
+  blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
+}
+
 /* lwip has provision for using a mutex, when applicable */
 /* This implementation is for single-threaded use only */
 sys_prot_t sys_arch_protect(void) {