追加更新：频率输出精度提高（添加四舍五入取整）

Core/Inc/tim.h

@@ -33,14 +33,14 @@ extern "C" {
 #define freq_operation(FREQ, PULSE)                                      \
   do                                                                     \
   {                                                                      \
-    if (FREQ <= 0 || FREQ >= FREQ_SYS || PULSE <= 0 || PULSE >= 100)      \
+    if (FREQ <= 0 || FREQ >= FREQ_SYS || PULSE <= 0 || PULSE >= 100)     \
     {                                                                    \
       HAL_TIMEx_PWMN_Stop(&htim1, TIM_CHANNEL_2);                        \
       return;                                                            \
     }                                                                    \
-    int32_t duty = FREQ_SYS / FREQ;                                  \
+    int32_t duty = ( (float32)FREQ_SYS / (float32)FREQ + (float32)0.5 ); \
     __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, duty *PULSE / 100 - 1); \
-    __HAL_TIM_SET_AUTORELOAD(&htim1, duty -1);                              \
+    __HAL_TIM_SET_AUTORELOAD(&htim1, duty -1);                           \
     HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_2);                         \
   } while (0)