diff --git a/app/by_fan_control.c b/app/by_fan_control.c
index 6ccf275..e5a115a 100644
--- a/app/by_fan_control.c
+++ b/app/by_fan_control.c
@@ -29,7 +29,7 @@ inline static uint32_t clip_u32(uint32_t x, uint32_t low, uint32_t up)
                                   : x);
 }
 
-inline static uint32_t clip_s32(int32_t x, int32_t low, int32_t up)
+inline static int32_t clip_s32(int32_t x, int32_t low, int32_t up)
 {
     return (x > up ? up : x < low ? low
                                   : x);
@@ -46,6 +46,35 @@ void by_pwm_init(void)
     pwm_init(FAN_LL_PWM_PIN, 50, 500);
     pwm_init(FAN_RL_PWM_PIN, 50, 500);
 
+    // 测试鸣叫
+    pwm_init(FAN_LS_PWM_A_PIN, 1500, 100);
+    pwm_init(FAN_LS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RS_PWM_A_PIN, 1500, 100);
+    pwm_init(FAN_RS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_LB_PWM_A_PIN, 1500, 100);
+    pwm_init(FAN_LB_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RB_PWM_A_PIN, 1500, 100);
+    pwm_init(FAN_RB_PWM_B_PIN, 4000, 0);
+    system_delay_ms(300);
+    pwm_init(FAN_LS_PWM_A_PIN, 2000, 100);
+    pwm_init(FAN_LS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RS_PWM_A_PIN, 2000, 100);
+    pwm_init(FAN_RS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_LB_PWM_A_PIN, 2000, 100);
+    pwm_init(FAN_LB_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RB_PWM_A_PIN, 2000, 100);
+    pwm_init(FAN_RB_PWM_B_PIN, 4000, 0);
+    system_delay_ms(300);
+    pwm_init(FAN_LS_PWM_A_PIN, 2500, 100);
+    pwm_init(FAN_LS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RS_PWM_A_PIN, 2500, 100);
+    pwm_init(FAN_RS_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_LB_PWM_A_PIN, 2500, 100);
+    pwm_init(FAN_LB_PWM_B_PIN, 4000, 0);
+    pwm_init(FAN_RB_PWM_A_PIN, 2500, 100);
+    pwm_init(FAN_RB_PWM_B_PIN, 4000, 0);
+    system_delay_ms(300);
+
     pwm_init(FAN_LS_PWM_A_PIN, 4000, 0);
     pwm_init(FAN_LS_PWM_B_PIN, 4000, 0);
     pwm_init(FAN_RS_PWM_A_PIN, 4000, 0);