pop noise fix

sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc

@@ -1617,13 +1617,22 @@ void AudioHwInit()
 /* Configures the external audio hardware for the required sample frequency */
 void AudioHwConfig(unsigned samFreq, unsigned mClk, unsigned dsdMode, unsigned sampRes_DAC, unsigned sampRes_ADC)
 {
+    static unsigned count = 0;
 	g_samfreq = samFreq;
     {
         sw_pll_fixed_clock(mClk);
     }
-    p_ctl_mute <: 1;
     // 通知tile0 (button_task) 采样率已变化，用于配置NAU88C22寄存器
     unsafe {uc_audiohw <: samFreq; }
     unsafe {uc_audiohw <: dsdMode; }
-}
 
+    if (count++ > 0)
+    {
+        p_ctl_mute <: 1;
+    }
+    else
+    {
+        debug_printf("don't unmute at boot\n");
+    }
+
+}