lufa: Fix for freeze at re/boot time problem

[max/tmk_keyboard.git] / tmk_core / protocol / lufa / lufa.c

diff --git a/tmk_core/protocol/lufa/lufa.c b/tmk_core/protocol/lufa/lufa.c
index eade7d1b7638e161b0d8154d01c983f0f70915d5..48034dbeab18ef9af9a668db43d740406be9e6c2 100644 (file)
--- a/tmk_core/protocol/lufa/lufa.c
+++ b/tmk_core/protocol/lufa/lufa.c
@@ -642,7 +642,7 @@ int main(void)
     print_set_sendchar(sendchar);
     host_set_driver(&lufa_driver);
 
-    print("Keyboard init.\n");
+    print("\n\nKeyboard init.\n");
     hook_early_init();
     keyboard_setup();
     setup_usb();
@@ -663,6 +663,7 @@ int main(void)
 #endif
         matrix_scan();
     }
+    print("\nUSB configured.\n");
 
     hook_late_init();
 
@@ -696,12 +697,12 @@ static uint8_t _led_stats = 0;
  __attribute__((weak))
 void hook_usb_suspend_entry(void)
 {
-    // Turn LED off to save power
-    // Set 0 with putting aside status before suspend and restore
-    // it after wakeup, then LED is updated at keyboard_task() in main loop
+    // Turn off LED to save power and keep its status to resotre it later.
+    // LED status will be updated by keyboard_task() in main loop hopefully.
     _led_stats = keyboard_led_stats;
     keyboard_led_stats = 0;
-    led_set(keyboard_led_stats);
+
+    // Calling long task here can prevent USB state transition
 
     matrix_clear();
     clear_keyboard();
@@ -730,10 +731,8 @@ void hook_usb_wakeup(void)
     sleep_led_disable();
 #endif
 
-    // Restore LED status
-    // BIOS/grub won't recognize/enumerate if led_set() takes long(around 40ms?)
-    // Converters fall into the case and miss wakeup event(timeout to reply?) in the end.
-    //led_set(host_keyboard_leds());
-    // Instead, restore stats and update at keyboard_task() in main loop
+    // Restore LED status and update at keyboard_task() in main loop
     keyboard_led_stats = _led_stats;
+
+    // Calling long task here can prevent USB state transition
 }