STM32——PWM波形输出

#include "stm32f10x.h"

int main(void) {
    // 使能TIM1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
    // 使能GPIOA时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // 设置GPIOA_8为复用功能推挽输出
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 初始化TIM1 PWM模式
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_TimeBaseStructure.TIM_Period = 10000 - 1; // 定时器周期，即频率1KHz
    TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; // 预分频器，确保定时器的时钟频率为72MHz
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 5000; // 占空比为50%
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

    TIM_Cmd(TIM1, ENABLE); // 使能定时器
    TIM_CtrlPWMOutputs(TIM1, ENABLE); // 使能PWM输出

    while (1) {
        // 在这里可以改变TIM_OCInitStructure.TIM_Pulse的值来改变占空比
        // 例如：改变占空比为30%
        TIM_SetCompare1(TIM1, 3000);
    }
}