stm32pwm输出方波的代码

以下是 STM32 PWM 输出方波的代码示例：

#include "stm32f4xx.h"

#define PWM_FREQ       4000  // PWM 频率
#define PWM_PERIOD     840   // PWM 周期

void init_pwm_gpio(void)
{
    // 配置 PWM 引脚的GPIO
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;  // PWM 输出引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  // 复用模式
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // 将 PWM 引脚绑定到 TIM10 的通道1上
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_TIM10);
}

void init_pwm_timer(void)
{
    // 配置 TIM10
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / PWM_FREQ / PWM_PERIOD - 1;  // 定时器分频
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD - 1;  // 定时器周期
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM10, &TIM_TimeBaseStructure);

    // 配置 TIM10 的通道1 为 PWM 模式
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM10, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM10, TIM_OCPreload_Enable);

    TIM_Cmd(TIM10, ENABLE);  // 启动TIM10
}

int main(void)
{
    init_pwm_gpio();
    init_pwm_timer();

    while(1);

    return 0;
}