From 2a4b27ed336799c2b6a3d92063cf5a0c41bef172 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Mon, 11 Mar 2024 22:00:21 +0700
Subject: [PATCH] add led blinky to cdc_dual_ports example

---
 examples/device/cdc_dual_ports/src/main.c | 70 ++++++++++++++++-------
 1 file changed, 50 insertions(+), 20 deletions(-)

diff --git a/examples/device/cdc_dual_ports/src/main.c b/examples/device/cdc_dual_ports/src/main.c
index 98f3ab923..1167a5d50 100644
--- a/examples/device/cdc_dual_ports/src/main.c
+++ b/examples/device/cdc_dual_ports/src/main.c
@@ -31,12 +31,24 @@
 #include "bsp/board_api.h"
 #include "tusb.h"
 
-//------------- prototypes -------------//
+/* 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;
+
+static void led_blinking_task(void);
 static void cdc_task(void);
 
 /*------------- MAIN -------------*/
-int main(void)
-{
+int main(void) {
   board_init();
 
   // init device stack on configured roothub port
@@ -46,28 +58,23 @@ int main(void)
     board_init_after_tusb();
   }
 
-  while (1)
-  {
+  while (1) {
     tud_task(); // tinyusb device task
     cdc_task();
+    led_blinking_task();
   }
 }
 
 // echo to either Serial0 or Serial1
 // with Serial0 as all lower case, Serial1 as all upper case
-static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count)
-{
+static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count) {
   uint8_t const case_diff = 'a' - 'A';
 
-  for(uint32_t i=0; i<count; i++)
-  {
-    if (itf == 0)
-    {
+  for (uint32_t i = 0; i < count; i++) {
+    if (itf == 0) {
       // echo back 1st port as lower case
       if (isupper(buf[i])) buf[i] += case_diff;
-    }
-    else
-    {
+    } else {
       // echo back 2nd port as upper case
       if (islower(buf[i])) buf[i] -= case_diff;
     }
@@ -77,21 +84,29 @@ static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count)
   tud_cdc_n_write_flush(itf);
 }
 
+// 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;
+}
+
+
 //--------------------------------------------------------------------+
 // USB CDC
 //--------------------------------------------------------------------+
-static void cdc_task(void)
-{
+static void cdc_task(void) {
   uint8_t itf;
 
-  for (itf = 0; itf < CFG_TUD_CDC; itf++)
-  {
+  for (itf = 0; itf < CFG_TUD_CDC; itf++) {
     // connected() check for DTR bit
     // Most but not all terminal client set this when making connection
     // if ( tud_cdc_n_connected(itf) )
     {
-      if ( tud_cdc_n_available(itf) )
-      {
+      if (tud_cdc_n_available(itf)) {
         uint8_t buf[64];
 
         uint32_t count = tud_cdc_n_read(itf, buf, sizeof(buf));
@@ -103,3 +118,18 @@ static void cdc_task(void)
     }
   }
 }
+
+//--------------------------------------------------------------------+
+// BLINKING TASK
+//--------------------------------------------------------------------+
+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
+}