GDF103RC使用TIM1输出三路pwm

GDF103RC的TIM1可以输出最多4路PWM信号，可以使用以下代码实现三路PWM输出：

#include "stm32f10x.h"

void TIM1_PWM_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_TIM1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 999; // PWM周期为1000
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 分频系数为72
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    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 = 0; // 初始占空比为0
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

    TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

    TIM_OC3Init(TIM1, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

    TIM_Cmd(TIM1, ENABLE);
}

int main(void)
{
    TIM1_PWM_Init();

    while(1) {
        TIM_SetCompare1(TIM1, 500); // 设置通道1的占空比为50%
        TIM_SetCompare2(TIM1, 250); // 设置通道2的占空比为25%
        TIM_SetCompare3(TIM1, 750); // 设置通道3的占空比为75%
        delay_ms(1000);
    }
}

其中，使用了GPIOA的8、9、10三个引脚作为PWM输出引脚，TIM1的时钟频率为72MHz，分频系数为72，因此PWM的周期为1ms，可根据需要修改。在main函数中，使用TIM_SetCompare函数设置每个PWM通道的占空比，实现三路PWM输出。