diff --git a/sw_usb_audio/app_usb_aud_fosi_c1_v71/src/extensions/tx1_led_helper.xc b/sw_usb_audio/app_usb_aud_fosi_c1_v71/src/extensions/tx1_led_helper.xc
index d0aef18..da50e80 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1_v71/src/extensions/tx1_led_helper.xc
+++ b/sw_usb_audio/app_usb_aud_fosi_c1_v71/src/extensions/tx1_led_helper.xc
@@ -8,6 +8,7 @@ on tile[1]: out port p_led_d1 = PORT_LED_D1;           // FOOTSTEPS indicator
 on tile[1]: out port p_led_d2 = PORT_LED_D2;           // MIC MUTE indicator
 on tile[1]: out port p_led_d3 = PORT_LED_D3;           // GUNSHOT (4A bit3)
 on tile[1]: out port p_led_d4_d7_d6 = PORT_LED_D4_7_6; // 4D: bit3=D4, bit2=D7, bit0=D6
+on tile[1]: in port p_mic_det = PORT_MIC_DET;         // MIC DETECT indicator
 
 // TX1 HTR3236 RGB LED driver control
 // 改动原因：与 xu316_qf60.xn 中 PORT_HTR3236_SDB 一致，避免硬编码端口与 xn 脱节
@@ -24,11 +25,14 @@ void tx1_led_helper_task(server interface tx1_led_if led_if)
 {
     // Local state mirrors for tile[1] ports
     unsigned d1_state = 1;  // active low: 1=off, 0=on
+    unsigned mic_det_state = 0;
     unsigned d2_state = 1;
     unsigned d3_state = 0xF;  // 4-bit port, bit3 controls D3
     unsigned d5_state = 1;
     unsigned d4_d7_d6_state = 0xF;  // bit3=D4, bit2=D7, bit0=D6
 
+    p_mic_det :> mic_det_state;
+
     // Init all LEDs off
     p_led_d1 <: 1;
     p_led_d2 <: 1;