update mic detection logic

sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc

@@ -2428,20 +2428,26 @@ void mute_handler(chanend c_mic_det)
     p_ctl_mute <: 0xf;
 
     // mic detect: bit1=mic1 (插入=高, 拔出=低), bit2=mic2 (插入=低, 拔出=高)
+    c_mic_det <: (unsigned)MIC_DET_MUTE;
     unsigned det_val;
     p_ctl_det :> det_val;
     unsigned mic1_in = (det_val >> 1) & 1;       // bit1: 1=inserted
     unsigned mic2_in = ((det_val >> 2) & 1) ^ 1; // bit2: 0=inserted, invert
+    unsigned phone_in = ((det_val >> 3) & 1) ^ 1; // bit3: 0=inserted, invert
     unsigned any_mic_in = mic1_in || mic2_in;
     unsigned prev_mic1_in = mic1_in;
     unsigned prev_mic2_in = mic2_in;
     unsigned prev_any_mic_in = any_mic_in;
+    unsigned prev_phone_in = phone_in;
 
     // 如果开机时全拔出，发送mute
-    if (!any_mic_in) {
-        c_mic_det <: (unsigned)MIC_DET_MUTE;
-    }
 
+    if (((det_val & 0b1110) == 0b1110) || ((det_val & 0b1110) == 0b1010) || ((det_val & 0b1110) == 0b0010)) {
+        // 有mic插入，恢复mic音量状态
+        c_mic_det <: (unsigned)MIC_DET_UNMUTE;
+        debug_printf("mic stable -> unmute\n");
+    }
+ 
     timer tmr;
     unsigned time;
     tmr :> time;
@@ -2457,14 +2463,16 @@ void mute_handler(chanend c_mic_det)
                 p_ctl_det :> det_val;
                 mic1_in = (det_val >> 1) & 1;
                 mic2_in = ((det_val >> 2) & 1) ^ 1;
+                phone_in = ((det_val >> 3) & 1) ^ 1;
                 any_mic_in = mic1_in || mic2_in;
 
                 // 检测单个mic插拔事件
                 unsigned mic1_changed = (mic1_in != prev_mic1_in);
                 unsigned mic2_changed = (mic2_in != prev_mic2_in);
                 unsigned any_changed = mic1_changed || mic2_changed;
+                unsigned phone_changed = (phone_in != prev_phone_in);
 
-                if (any_changed) {
+                if (any_changed || phone_changed) {
                     // 状态变化：立即mute mic和DAC防止pop音
                     p_ctl_mute <: 0;
                     c_mic_det <: (unsigned)MIC_DET_MUTE;
@@ -2486,12 +2494,25 @@ void mute_handler(chanend c_mic_det)
                     p_ctl_det :> det_val;
                     mic1_in = (det_val >> 1) & 1;
                     mic2_in = ((det_val >> 2) & 1) ^ 1;
+                    phone_in = ((det_val >> 3) & 1) ^ 1;
                     any_mic_in = mic1_in || mic2_in;
 
                     // 恢复DAC状态
                     c_mic_det <: (unsigned)MIC_DET_DAC_UNMUTE;
 
-                    if (any_mic_in) {
+#if 0
+                    if ((any_mic_in && !phone_in) || (phone_in && mic2_in)) {
+                        // 有mic插入，恢复mic音量状态
+                        c_mic_det <: (unsigned)MIC_DET_UNMUTE;
+                        debug_printf("mic stable -> unmute\n");
+                    }
+                    // 全拔出则保持mic mute
+
+                    delay_milliseconds(200);
+
+#endif
+
+                    if (((det_val & 0b1110) == 0b1110) || ((det_val & 0b1110) == 0b1010) || ((det_val & 0b1110) == 0b0010)) {
                         // 有mic插入，恢复mic音量状态
                         c_mic_det <: (unsigned)MIC_DET_UNMUTE;
                         debug_printf("mic stable -> unmute\n");
@@ -2501,7 +2522,7 @@ void mute_handler(chanend c_mic_det)
                     prev_mic1_in = mic1_in;
                     prev_mic2_in = mic2_in;
                     prev_any_mic_in = any_mic_in;
-
+                    prev_phone_in = phone_in;
                     // 重新同步timer
                     tmr :> time;
                     time += MIC_DET_POLL_MS * 100000;