106 lines
1.4 KiB
C
106 lines
1.4 KiB
C
/*
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* buzzer.c
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*
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* Created on: Mar 6, 2022
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* Author: wuwen
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*/
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#include "buzzer.h"
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struct notes *notes;
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void play_ones(uint16_t freq,uint8_t dutya)
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{
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//寄存器写法 需要根据单片机的时钟来写。
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TIM4->ARR = (uint32_t)((72000000/freq)-1);TIM4->CCR3 = (uint32_t)(((72000000/freq)-1)*((float)dutya/100));
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}
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void add_a_note(uint16_t freq,uint8_t duty,uint16_t deley)//添加一个音符
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{
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struct notes* buff;
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buff = (struct notes*)malloc(sizeof(struct notes));
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if (buff != NULL)
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{
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buff->freq = freq;
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buff->duty = duty;
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buff->deley = deley;
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buff->next_note = NULL;
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if (notes == NULL)
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{
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notes = buff;
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}
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else
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{
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struct notes *t = notes;
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while (t->next_note != NULL)
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{
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t = t->next_note;
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}
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t->next_note = buff;
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}
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}
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}
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void delhead() //删除第一个音符 一般用户不需要调用
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{
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if (notes == NULL)
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{
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return;
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}
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if (notes->next_note == NULL)
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{
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free(notes);
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notes = NULL;
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}
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else
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{
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struct notes *t = notes;
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notes = notes->next_note;
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free(t);
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}
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}
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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
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{
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static char busy_flag=0;
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static uint32_t play_delay;
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if(notes == NULL)
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{
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//play_ones(0,0);
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}else
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{
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if(busy_flag==0)
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{
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busy_flag=1;
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play_delay=HAL_GetTick()+notes->deley;
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play_ones(notes->freq,notes->duty);
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}
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if(busy_flag==1)
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{
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if(HAL_GetTick()>play_delay)
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{
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busy_flag=0;
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delhead();
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}
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}
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}
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return busy_flag;
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}
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