STM32定时器TIM2输出PWM的代码

以下是使用STM32定时器TIM2输出PWM的代码示例：

#include "stm32f10x.h"

void TIM2_PWM_Init(void)
{
    // Step 1: Enable the clock for TIM2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // Step 2: Configure the PWM output pin
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // PA0
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // Push-Pull Alternative Function mode
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Step 3: Configure the timer
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 999; // 1 kHz frequency (1 ms period)
    TIM_TimeBaseStructure.TIM_Prescaler = 719; // 72 MHz clock -> 100 kHz timer clock
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // Step 4: Configure the PWM mode
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 499; // 50% duty cycle
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);

    // Step 5: Enable the timer
    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    TIM2_PWM_Init();

    while (1)
    {
        // Your code here
    }
}

该代码将PA0配置为TIM2的PWM输出引脚，使用72 MHz的系统时钟和TIM2的分频器预分频器将计时器时钟设置为100 kHz。TIM2的周期设置为999，因此PWM输出的频率为1 kHz。TIM2的通道2配置为PWM输出模式，占空比为50％。在主循环中，您可以添加其他代码以处理其他任务。