add mic

product/YP4025-interface.md

@@ -64,3 +64,7 @@
     //继电器,查看开门信号状态,1开;0关; 1,高电平,0.低电平
  private static String GPIO_PATH = "/sys/class/gpio_out/gpioc6"; 
 ~~~
+
+### A350 mic 麦克 风 接口：
+card 0, device 7, mic number 2, ref number 2, bit 16, sample rate 16000
+