1 files changed, 40 insertions, 32 deletions
diff --git a/src/AudioOut.vhd b/src/AudioOut.vhd
index 715bf7f..c19a19a 100644
--- a/src/AudioOut.vhd
+++ b/src/AudioOut.vhd
@@ -16,10 +16,10 @@ entity AudioOut is
 end AudioOut;
 
 architecture Behavioral of AudioOut is
-    signal count: integer;
-    --signal bStartMusic : boolean;
+    signal count: integer := 0;
+    signal bStartMusic : boolean := false;
 
-begin
+begin    
     process (reset, clk) 
     variable currentThreasHold: integer;
     begin        
@@ -35,37 +35,45 @@ begin
             outMusic <= '0';
             count <= 0;
             currentThreasHold := 0;
-            
+                  
             -- start code
-            -- calculate amount of puls to turn on PWM
-            -- calculate available PWM pulses: (INPUT_CLK_KHZ/INPUT_AUDIO_KHZ)
-            -- multiply by target audio signal level
-            -- devide by available audio signal depth
-            currentThreasHold := ((INPUT_CLK_HZ/INPUT_AUDIO_HZ) * to_integer(unsigned(inMusicData))) / (INPUT_DEPTH);
-            
-            -- check if PWM duty cicle is high enough: currentThreasHold has to be variable otherwise first check count = 1 one to late
-            if (count >= currentThreasHold) then
-                -- no pwm output
-                outMusic <= '0';
-            else
-                -- keep pwm high
-                outMusic <= '1';
+            -- sync count to soundlevel input
+            if (bStartMusic = true) then          
+                -- calculate amount of puls to turn on PWM
+                -- calculate available PWM pulses: (INPUT_CLK_KHZ/INPUT_AUDIO_KHZ)
+                -- multiply by target audio signal level
+                -- devide by available audio signal depth
+                currentThreasHold := ((INPUT_CLK_HZ/INPUT_AUDIO_HZ) * to_integer(unsigned(inMusicData))) / (INPUT_DEPTH);
+                
+                -- check if PWM duty cicle is high enough: currentThreasHold has to be variable otherwise first check count = 1 one to late
+                if (count >= currentThreasHold) then
+                    -- no pwm output
+                    outMusic <= '0';
+                else
+                    -- keep pwm high
+                    outMusic <= '1';
+                end if;
+                
+                --
+                count <= count + 1;
+                
+                -- check for max level
+                -- if counter is >= the max amount of pulses per audio sample
+                if (count >= (INPUT_CLK_HZ/INPUT_AUDIO_HZ)) then
+                    -- Next audio sample
+                    count <= 1;
+                end if;
             end if;
-            
-            --
-            count <= count + 1;
-            
-            -- check for max level
-            -- if counter is >= the max amount of pulses per audio sample
-            if (count >= (INPUT_CLK_HZ/INPUT_AUDIO_HZ)) then
-                -- Next audio sample
-                count <= 1;
-            end if;
-            
-            
-            
-            
         end if;
     end process;
-
+    
+    process (reset)
+    begin      
+        if (reset = '1') then
+            bStartMusic <= false;
+        else
+            -- start sound level input sync
+            bStartMusic <= true;
+        end if;     
+    end process;
 end Behavioral;