diff --git a/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c b/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
index f5b9af4..0210004 100644
--- a/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
+++ b/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
@@ -71,13 +71,15 @@ uint32_t g_sys_freq = 0;
 #define OPT_IN1               (GPIOB_ReadPortPin(GPIO_Pin_10))
 
 /*===========================================================================
- * LEDB 红色呼吸灯 (PB23, PWM11)
+ * LEDB 红色呼吸灯 (PB23, PWM11) — 快速心跳指示 (~2s 周期)
  *   PWM freq ≈ 60MHz / (PWM_CLK_DIV * 128) ≈ 5.86kHz @DIV=80
- *   呼吸周期 ≈ (127*2*50ms) + 0.5s + 0.3s ≈ 13.5s
+ *   周期 = 16步渐亮 + 3tick高亮 + 16步渐灭 + 3tick低亮
+ *       ≈ (16*50ms)*2 + 150ms*2 ≈ 1.9s
  *===========================================================================*/
 #define  PWM_CLK_DIV          80
 #define  PWM_CYCLE            128          // 7-bit 分辨率 (0~127)
-#define  BREATH_STEP_DELAY    1            // 每 50ms 更新一次占空比 (步进平滑)
+#define  BREATH_STEP_DELAY    1            // 每 50ms 更新一次
+#define  BREATH_DUTY_STEP     8            // 每步跳 8 级占空比
 #define  BREATH_FADE_IN       0
 #define  BREATH_HOLD_HIGH     1
 #define  BREATH_FADE_OUT      2
@@ -1125,39 +1127,43 @@ void TMR1_IRQHandler(void)
                 }
             }
 
-            /*--- LEDB 红色呼吸灯 (PWM11, 50ms tick) ---*/
+            /*--- LEDB 红色呼吸灯 (PWM11, 50ms tick, ~1.9s 心跳周期) ---*/
             g_breath_tick++;
             switch (g_breath_phase) {
-                case BREATH_FADE_IN:   // 渐亮 0 → max, 每300ms一步
+                case BREATH_FADE_IN:   // 渐亮 0 → max, ~800ms
                     if (g_breath_tick >= BREATH_STEP_DELAY) {
                         g_breath_tick = 0;
-                        g_breath_duty++;
-                        PWM11_ActDataWidth(g_breath_duty);
-                        if (g_breath_duty >= PWM_CYCLE - 1) {
+                        if (g_breath_duty + BREATH_DUTY_STEP >= PWM_CYCLE) {
+                            g_breath_duty = PWM_CYCLE - 1;
                             g_breath_phase = BREATH_HOLD_HIGH;
                             g_breath_tick = 0;
+                        } else {
+                            g_breath_duty += BREATH_DUTY_STEP;
                         }
+                        PWM11_ActDataWidth(g_breath_duty);
                     }
                     break;
-                case BREATH_HOLD_HIGH: // 最亮保持 ~0.5s
-                    if (g_breath_tick >= 10) {
+                case BREATH_HOLD_HIGH: // 最亮保持 ~150ms
+                    if (g_breath_tick >= 3) {
                         g_breath_phase = BREATH_FADE_OUT;
                         g_breath_tick = 0;
                     }
                     break;
-                case BREATH_FADE_OUT:  // 渐灭 max → 0, 每300ms一步
+                case BREATH_FADE_OUT:  // 渐灭 max → 0, ~800ms
                     if (g_breath_tick >= BREATH_STEP_DELAY) {
                         g_breath_tick = 0;
-                        g_breath_duty--;
-                        PWM11_ActDataWidth(g_breath_duty);
-                        if (g_breath_duty == 0) {
+                        if (g_breath_duty <= BREATH_DUTY_STEP) {
+                            g_breath_duty = 0;
                             g_breath_phase = BREATH_HOLD_LOW;
                             g_breath_tick = 0;
+                        } else {
+                            g_breath_duty -= BREATH_DUTY_STEP;
                         }
+                        PWM11_ActDataWidth(g_breath_duty);
                     }
                     break;
-                case BREATH_HOLD_LOW:  // 最暗保持 ~0.3s
-                    if (g_breath_tick >= 6) {
+                case BREATH_HOLD_LOW:  // 最暗保持 ~150ms
+                    if (g_breath_tick >= 3) {
                         g_breath_phase = BREATH_FADE_IN;
                         g_breath_tick = 0;
                     }