stm32 pwm控制代码c语言

以下是一个简单的示例代码，使用STM32的TIM1模块来控制PWM输出：

#include "stm32f4xx.h"

void TIM_Config(void);
void GPIO_Config(void);

int main(void)
{
    TIM_Config();
    GPIO_Config();

    while (1)
    {
        // 控制PWM占空比
        TIM1->CCR1 = 500; // CCR1用于控制PWM1的占空比
    }
}

void TIM_Config(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    // 使能TIM1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    // 设置TIM1为PWM模式
    TIM_TimeBaseStructure.TIM_Period = 1000; // PWM周期为1ms
    TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1; // 定时器的时钟为84MHz，分频84，计数器时钟为1MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    // 配置PWM通道
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

    // 启动TIM1
    TIM_Cmd(TIM1, ENABLE);
}

void GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    // 使能GPIOA时钟
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    // 配置PA8为TIM1_CH1引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 将PA8设置为TIM1_CH1功能
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
}

这段代码使用TIM1的PWM1模式，将占空比设置为50%。可以根据需要修改占空比和PWM周期。在该示例中，PA8引脚被配置为TIM1_CH1引脚，并连接到PWM输出设备。