diff --git a/firmware/src/boards/cynthion_d11/led.c b/firmware/src/boards/cynthion_d11/led.c
index 22ab9f5..a8e4fac 100644
--- a/firmware/src/boards/cynthion_d11/led.c
+++ b/firmware/src/boards/cynthion_d11/led.c
@@ -25,16 +25,6 @@
 static blink_pattern_t blink_pattern = BLINK_IDLE;
 
 
-/**
- * Sets the active LED blink pattern.
- */
-void led_set_blink_pattern(blink_pattern_t pattern)
-{
-    blink_pattern = pattern;
-    leds_off();
-}
-
-
 /**
  * Sets up each of the LEDs for use.
  */
@@ -125,6 +115,24 @@ static void display_led_number(uint8_t number)
 }
 
 
+/**
+ * Sets the active LED blink pattern.
+ */
+void led_set_blink_pattern(blink_pattern_t pattern)
+{
+    blink_pattern = pattern;
+    leds_off();
+    // Values of 0 to 31 should be set immediately as static patterns.
+    if (blink_pattern < 32) {
+      for (int i = 0; i < 5; i++) {
+        if (blink_pattern & (1 << i)) {
+          display_led_number(i);
+        }
+      }
+    }
+}
+
+
 /**
  * Task that handles blinking the heartbeat LED.
  */
@@ -134,6 +142,11 @@ void heartbeat_task(void)
   static uint8_t active_led = 0;
   static bool count_up = true;
 
+  // Values of 0 to 31 define static patterns only.
+  if (blink_pattern < 32) {
+    return;
+  }
+
   // Blink every interval ms
   if ( board_millis() - start_ms < blink_pattern) return; // not enough time
   start_ms += blink_pattern;
diff --git a/firmware/src/boards/cynthion_d21/led.c b/firmware/src/boards/cynthion_d21/led.c
index 44e7161..05470c3 100644
--- a/firmware/src/boards/cynthion_d21/led.c
+++ b/firmware/src/boards/cynthion_d21/led.c
@@ -25,16 +25,6 @@
 static blink_pattern_t blink_pattern = BLINK_IDLE;
 
 
-/**
- * Sets the active LED blink pattern.
- */
-void led_set_blink_pattern(blink_pattern_t pattern)
-{
-	blink_pattern = pattern;
-	leds_off();
-}
-
-
 /**
  * Sets up each of the LEDs for use.
  */
@@ -112,6 +102,24 @@ static void display_led_number(uint8_t number)
 }
 
 
+/**
+ * Sets the active LED blink pattern.
+ */
+void led_set_blink_pattern(blink_pattern_t pattern)
+{
+    blink_pattern = pattern;
+    leds_off();
+    // Values of 0 to 31 should be set immediately as static patterns.
+    if (blink_pattern < 32) {
+      for (int i = 0; i < 5; i++) {
+        if (blink_pattern & (1 << i)) {
+          display_led_number(i);
+        }
+      }
+    }
+}
+
+
 /**
  * Task that handles blinking the heartbeat LED.
  */
@@ -121,6 +129,11 @@ void heartbeat_task(void)
   static uint8_t active_led = 0;
   static bool count_up = true;
 
+  // Values of 0 to 31 define static patterns only.
+  if (blink_pattern < 32) {
+    return;
+  }
+
   // Blink every interval ms
   if ( board_millis() - start_ms < blink_pattern) return; // not enough time
   start_ms += blink_pattern;
diff --git a/firmware/src/led.h b/firmware/src/led.h
index 70ed09b..c643089 100644
--- a/firmware/src/led.h
+++ b/firmware/src/led.h
@@ -13,7 +13,13 @@
 #include <apollo_board.h>
 
 /**
- * Different blink patterns with different semantic meanings.
+ * LED patterns.
+ *
+ * Values 0 to 31 will be interpreted as static bitmasks, and can be used
+ * to turn on specific combinations of LEDs in a fixed pattern.
+ *
+ * Other values as defined in this enum will produce dynamic blink patterns,
+ * with different semantic meanings.
  */
 typedef enum {
   BLINK_IDLE = 500,
@@ -27,6 +33,8 @@ typedef enum {
 
 /**
  * Sets the active LED blink pattern.
+ *
+ * See @ref blink_pattern_t for the meaning of the pattern argument.
  */
 void led_set_blink_pattern(blink_pattern_t pattern);