diff --git a/main.c b/main.c
index 4cfc8c8..f389e6e 100644
--- a/main.c
+++ b/main.c
@@ -126,6 +126,7 @@ void task0_func(UArg arg1, UArg arg2)
 
 void capture_waveform(UArg arg1, UArg arg2)
 {
+    IntMasterEnable();
     while(true) {
         Semaphore_pend(capture_sem, BIOS_WAIT_FOREVER);
 
@@ -170,6 +171,9 @@ void process_waveform(UArg arg1, UArg arg2) {
 
 void display_waveform(UArg arg1, UArg arg2)
 {
+    while(1) {
+        Semaphore_pend(display_sem, BIOS_WAIT_FOREVER);
+    }
 }