STM32语音播报代码

以下是一份基于STM32的语音播报代码，使用了PWM输出控制声音模块：

#include "stm32f10x.h"

#define PWM_FREQ 16000 // PWM频率，单位为Hz
#define PWM_TIM TIM2 // PWM所使用的定时器
#define PWM_GPIO GPIOA // PWM所使用的GPIO端口
#define PWM_PIN GPIO_Pin_0 // PWM所使用的GPIO引脚
#define PWM_AF GPIO_AF_TIM2 // PWM所使用的GPIO复用功能

#define SPEAKER_FREQ 440 // 语音频率，单位为Hz
#define SPEAKER_DUTY_CYCLE 50 // 语音占空比，范围0~100

void PWM_Config(void);
void Speaker_Play(uint16_t freq, uint8_t duty_cycle);

int main(void)
{
    PWM_Config(); // 配置PWM
    Speaker_Play(SPEAKER_FREQ, SPEAKER_DUTY_CYCLE); // 播放语音
    while (1);
}

void PWM_Config(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    // 使能GPIOA和TIM2时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // 配置GPIOA.0为复用推挽输出
    GPIO_InitStructure.GPIO_Pin = PWM_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(PWM_GPIO, &GPIO_InitStructure);

    // 配置TIM2为PWM模式
    TIM_TimeBaseStructure.TIM_Period = SystemCoreClock / PWM_FREQ - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(PWM_TIM, &TIM_TimeBaseStructure);

    // 配置TIM2的通道1为PWM输出
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = (SystemCoreClock / PWM_FREQ) * SPEAKER_DUTY_CYCLE / 100 - 1;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(PWM_TIM, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(PWM_TIM, TIM_OCPreload_Enable);

    // 启动TIM2
    TIM_Cmd(PWM_TIM, ENABLE);
}

void Speaker_Play(uint16_t freq, uint8_t duty_cycle)
{
    TIM_OCInitTypeDef TIM_OCInitStructure;

    // 设置PWM频率
    PWM_TIM->ARR = SystemCoreClock / freq - 1;

    // 设置PWM占空比
    TIM_OCInitStructure.TIM_Pulse = (SystemCoreClock / freq) * duty_cycle / 100 - 1;
    TIM_OC1Init(PWM_TIM, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(PWM_TIM, TIM_OCPreload_Enable);
}

在上述代码中，`PWM_Config`函数用于配置PWM输出，`Speaker_Play`函数用于播放指定频率和占空比的语音。可以根据需要修改`SPEAKER_FREQ`和`SPEAKER_DUTY_CYCLE`的值以改变要播放的语音内容。