update beep pwm drive

Power_Pico/BSP/BEEP/beep.c

@@ -0,0 +1,10 @@
+#include "beep.h"
+#include "tim.h"
+
+void beep_open(void) {
+    HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_4); // 启动PWM通道4用于蜂鸣器
+}
+
+void beep_close(void) {
+    HAL_TIM_PWM_Stop(&htim4, TIM_CHANNEL_4); // 停止PWM通道4
+}

Power_Pico/BSP/BEEP/beep.h

@@ -0,0 +1,18 @@
+#ifndef __BEEP_H__
+#define __BEEP_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "main.h"
+
+void beep_open(void);
+void beep_close(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+