47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#include "bsp_buzzer.h"
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#include "main.h"
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extern TIM_HandleTypeDef htim4;
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void buzzer_on(uint16_t psc, uint16_t pwm)
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{
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__HAL_TIM_PRESCALER(&htim4, psc);
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__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_3, pwm);
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}
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void buzzer_off(void)
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{
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__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_3, 0);
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}
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/**
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* @brief 用蜂鸣器发出音符
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* @param note note
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* @param volume 音量，范围[0.0\\~1.0],用百分比表示
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*/
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void buzzer_note(uint16_t note,float volume)
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{
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if(volume > 1.0f)
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{
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volume = 1.0f;
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}else if(volume < 0.0f)
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{
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volume = 0.0f;
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}
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// 禁用定时器
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__HAL_TIM_DISABLE(&htim4);
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// 重置定时器计数器
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htim4.Instance->CNT = 0;
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// 设置自动重装载寄存器（ARR），以控制PWM信号的频率
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htim4.Instance->ARR = (8*21000 / note - 1) * 1u;
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// 设置比较寄存器（CCR3），以控制PWM信号的占空比
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htim4.Instance->CCR3 = (8*10500 / note - 1) * volume * 1u;
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// 重新启用定时器
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__HAL_TIM_ENABLE(&htim4);
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// 启动PWM信号
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HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_3);
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}
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