From b3739a6a7be52d02dc1c508051633b5f46a13726 Mon Sep 17 00:00:00 2001
From: Jeremy Tan <jeremy@jx.tan.fake>
Date: Wed, 18 Sep 2013 09:04:17 +0800
Subject: [PATCH] Change actuator code to turn on/off all leds

---
 server/actuator.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/server/actuator.c b/server/actuator.c
index af69c7f..9d2ad13 100644
--- a/server/actuator.c
+++ b/server/actuator.c
@@ -164,7 +164,28 @@ void Actuator_SetValue(Actuator * a, double value)
 	//TODO: Set actuator
 	switch (a->id)
 	{
-		case ACTUATOR_TEST0:
+		case ACTUATOR_TEST0: 
+			{
+				FILE *led_handle = NULL;	//code reference: http://learnbuildshare.wordpress.com/2013/05/19/beaglebone-black-controlling-user-leds-using-c/
+				const char *led_format = "/sys/class/leds/beaglebone:green:usr%d/brightness";
+				char buf[50];
+				bool turn_on = value;
+
+				for (int i = 0; i < 4; i++) 
+				{
+					snprintf(buf, 50, led_format, i);
+					if ((led_handle = fopen(buf, "w")) != NULL)
+					{
+						if (turn_on)
+							fwrite("1", sizeof(char), 1, led_handle);
+						else
+							fwrite("0", sizeof(char), 1, led_handle);
+						fclose(led_handle);
+					}
+					else
+						Log(LOGDEBUG, "LED fopen failed: %s", strerror(errno)); 
+				}
+			}
 			break;
 		case ACTUATOR_TEST1:
 			break;
-- 
2.20.1