Blink LED rapidly when asking ACK from user.

src/gnuk.h

@@ -445,6 +445,7 @@ extern const uint8_t gnuk_string_serial[];
 #define LED_GNUK_EXEC		 32
 #define LED_START_COMMAND	 64
 #define LED_FINISH_COMMAND	128
+#define LED_WAIT_FOR_BUTTON	256
 #define LED_OFF	 LED_FINISH_COMMAND
 void led_blink (int spec);
 

src/main.c

@@ -238,6 +238,7 @@ main (int argc, const char *argv[])
   uintptr_t entry;
 #endif
   chopstx_t ccid_thd;
+  int wait_for_ack = 0;
 
   chopstx_conf_idle (1);
 
@@ -354,7 +355,11 @@ main (int argc, const char *argv[])
     {
       eventmask_t m;
 
-      m = eventflag_wait (&led_event);
+      if (wait_for_ack)
+	m = eventflag_wait_timeout (&led_event, LED_TIMEOUT_INTERVAL);
+      else
+	m = eventflag_wait (&led_event);
+
       switch (m)
 	{
 	case LED_ONESHOT:
@@ -371,12 +376,16 @@ main (int argc, const char *argv[])
 	  display_fatal_code ();
 	  break;
 	case LED_SYNC:
+	  wait_for_ack = 0;
 	  set_led (led_inverted);
 	  break;
 	case LED_GNUK_EXEC:
 	  goto exec;
+	case LED_WAIT_FOR_BUTTON:
+	  wait_for_ack = 1;
+	  /* fall through */
 	default:
-	  emit_led (LED_TIMEOUT_ZERO, LED_TIMEOUT_STOP);
+	  emit_led (LED_TIMEOUT_ONE, LED_TIMEOUT_ZERO);
 	  break;
 	}
     }

src/openpgp.c

@@ -1644,8 +1644,7 @@ openpgp_card_thread (void *arg)
 
       led_blink (LED_START_COMMAND);
       r = process_command_apdu ();
-      if (!r)
-	led_blink (LED_FINISH_COMMAND);
+      led_blink (LED_FINISH_COMMAND);
     done:
       eventflag_signal (ccid_comm, r? EV_EXEC_FINISHED_ACK : EV_EXEC_FINISHED);
     }

src/usb-ccid.c

@@ -29,6 +29,10 @@
 
 #include "config.h"
 
+#ifdef ACKBTN_SUPPORT
+#include <contrib/ackbtn.h>
+#endif
+
 #ifdef DEBUG
 #include "usb-cdc.h"
 #include "debug.h"
@@ -1844,6 +1848,7 @@ ccid_thread (void *arg)
 	if (c->ccid_state == CCID_STATE_EXECUTE)
 	  {
 	    ackbtn_enable ();
+	    led_blink (LED_WAIT_FOR_BUTTON);
 	    c->ccid_state = CCID_STATE_CONFIRM_ACK;
 	  }
 	else