#include "stm32f10x.h"
#include "buzzer.h"
void Delay_ms(uint32_t ms) {
volatile uint32_t i, j;
for (i = 0; i < ms; i++) {
for (j = 0; j < 1000; j++);
}
}
int main(void) {
// ?????
SystemInit();
Buzzer_Init();
while (1) {
// ??????
for (uint16_t freq = 200; freq <= 2000; freq += 100) {
Change_Tone(freq);
Delay_ms(300000);
}
for (uint16_t freq = 2000; freq >= 200; freq -= 100) {
Change_Tone(freq);
Delay_ms(300000);
}
// ????
Play_Song(birthday_notes, birthday_durations, 25);
Delay_ms(300000); // ????
}
return 0;
}
#ifndef __BUZZER_H
#define __BUZZER_H
#include "stm32f10x.h"
// ?????(Hz)
extern const uint16_t tone_freq[];
// ????
extern const uint8_t birthday_notes[];
extern const uint8_t birthday_durations[];
// ????
void Buzzer_Init(void);
void Change_Tone(uint16_t freq);
void Play_Song(const uint8_t* notes, const uint8_t* durations, uint8_t len);
#endif /* __BUZZER_H */
#include "buzzer.h"
// C???????
const uint16_t tone_freq[] = {
0, 262, 294, 330, 349, 392, 440, 494, 523
};
// ???????
const uint8_t birthday_notes[] = {
1,1,2,1,5,4, 1,1,2,1,6,5, 1,1,8,6,4,3,2, 7,7,6,4,5,4
};
const uint8_t birthday_durations[] = {
2,2,2,2,4,4, 2,2,2,2,4,4, 2,2,4,4,4,4,2, 2,2,4,4,4,4
};
// ????(??SysTick????????)
static void Delay_ms(uint32_t ms) {
uint32_t i;
for (i = 0; i < ms; i++) {
__asm("nop"); __asm("nop"); __asm("nop");
}
}
void Buzzer_Init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// ??????
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// ??PB10???????
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// ??????????200Hz-2000Hz????
uint16_t prescaler = 72 - 1; // 72MHz / 72 = 1MHz????
uint16_t max_arr = 1000000 / 200 - 1; // 200Hz???ARR?(4999)
// ??????
TIM_TimeBaseStructure.TIM_Period = max_arr;
TIM_TimeBaseStructure.TIM_Prescaler = prescaler;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
// ??PWM??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = max_arr / 2; // 50%??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_Cmd(TIM2, ENABLE);
}
// ??????
#define MIN_FREQ 100 // ??????(Hz)
#define MAX_FREQ 10000 // ??????(Hz)
void Change_Tone(uint16_t freq) {
// ??????
if (freq == 0) {
TIM_SetCompare3(TIM2, 0); // ??PWM??
return;
}
// ??????
if (freq < MIN_FREQ) {
freq = MIN_FREQ; // ??????
// ?????????
} else if (freq > MAX_FREQ) {
freq = MAX_FREQ; // ??????
// ?????????
}
// ????????????
uint32_t arr_calc = 1000000 / freq; // 1MHz / ??
// ??????
if (arr_calc > 65535) {
arr_calc = 65535; // ?????
// ?????????
}
uint16_t arr = (uint16_t)arr_calc;
uint16_t compare = arr / 2; // 50%???
// ???????
TIM_SetAutoreload(TIM2, arr);
TIM_SetCompare3(TIM2, compare);
}
// ????
void Play_Song(const uint8_t* notes, const uint8_t* durations, uint8_t len) {
for (uint8_t i = 0; i < len; i++) {
uint16_t freq = tone_freq[notes[i]];
Change_Tone(freq);
Delay_ms(durations[i] * 500); // ??????
Change_Tone(0); // ????
Delay_ms(1000);
}
}
为什么蜂鸣器不发出声响，可以正常烧录，也没有报错
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