完成莫尔斯电码功能

Signed-off-by: kevin <kevin@lmve.net>

HW_Devices/buzzer.c

@@ -0,0 +1,105 @@
+/*
+ * buzzer.c
+ *
+ *  Created on: Mar 6, 2022
+ *      Author: wuwen
+ */
+
+
+#include "buzzer.h"
+
+struct notes *notes;
+
+void play_ones(uint16_t freq,uint8_t dutya)
+{
+//寄存器写法  需要根据单片机的时钟来写。
+TIM4->ARR  = (uint32_t)((72000000/freq)-1);TIM4->CCR3 = (uint32_t)(((72000000/freq)-1)*((float)dutya/100));
+}
+
+
+
+void add_a_note(uint16_t freq,uint8_t duty,uint16_t deley)//添加一个音符
+{
+struct notes* buff;
+buff = (struct notes*)malloc(sizeof(struct notes));
+if (buff != NULL)
+{
+buff->freq = freq;
+buff->duty = duty;
+buff->deley = deley;
+buff->next_note = NULL;
+
+if (notes == NULL)
+{
+notes = buff;
+}
+else
+{
+struct notes *t = notes;
+while (t->next_note != NULL)
+{
+t = t->next_note;
+}
+t->next_note = buff;
+}
+}
+
+}
+
+void delhead()                    //删除第一个音符  一般用户不需要调用
+{
+if (notes == NULL)
+{
+return;
+}
+
+
+if (notes->next_note == NULL)
+{
+free(notes);
+notes = NULL;
+}
+else
+{
+struct notes *t = notes;
+notes = notes->next_note;
+free(t);
+
+}
+
+
+
+}
+
+char buzzer_play_server()                     //放在主循环  只有有音符添加进来就会播放，播放完自动释放
+{
+
+
+static char busy_flag=0;
+static uint32_t play_delay;
+
+if(notes == NULL)
+{
+	//play_ones(0,0);
+}else
+{
+	if(busy_flag==0)
+	{
+		busy_flag=1;
+		play_delay=HAL_GetTick()+notes->deley;
+		play_ones(notes->freq,notes->duty);
+	}
+	if(busy_flag==1)
+	{
+		if(HAL_GetTick()>play_delay)
+		{
+			busy_flag=0;
+			delhead();
+		}
+	}
+}
+
+
+
+return busy_flag;
+}