由于硬件原因，现在需要任意I/O输出多路占空比可调pwm，我尝试利用定时器的比较时间模式（TIM_OCMode_Timing），然后在中断里面更新占空比和频率。可能是我思路不对，只能改变频率，占空比一直是50%，也就是改变不了频率。另外利用翻转模式（TIM_OCMode_Toggle）是不是只能对应TIMx固定的输出引脚？程序如下 有空闲的朋友帮忙看下，或者给点任意I/O输出占空比可调pwm的思路
void TIM2_Int_Init(void)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
         TIM_OCInitTypeDef TIM_OCInitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //ê±Öóê1Äü

        TIM_TimeBaseStructure.TIM_Period = 65535; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔؼÄ′æÆ÷ÖüÆúμÄÖμ         ¼Æêyμ½5000Îa500ms
        TIM_TimeBaseStructure.TIM_Prescaler =0; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ  10KhzμļÆêyÆμÂê  
        TIM_TimeBaseStructure.TIM_ClockDivision = 0; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéϼÆêyÄ￡ê½
        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥λ

        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;//éèÖñè½Ïê±¼äÄ￡ê½
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//êä3öê1Äü
        TIM_OCInitStructure.TIM_Pulse = 3600;//éèÖñè½ÏÖμ
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //êä3ö¼«DÔ
        TIM_OC1Init(TIM2, &TIM_OCInitStructure);//3õê¼»ˉTIM2μÄêä3öí¨μà1
        TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);//2»×Ô¶ˉÖØ×°¼ÆêyÖμ

        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//êä3öê1Äü
        TIM_OCInitStructure.TIM_Pulse = 3600;//éèÖñè½ÏÖμ
        TIM_OC2Init(TIM2, &TIM_OCInitStructure);//3õê¼»ˉTIM2μÄêä3öí¨μà2
        TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);//2»×Ô¶ˉÖØ×°¼ÆêyÖμ
       
        TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2  , ENABLE);//Çå3yÖD¶Ï±êÖ¾
        TIM_Cmd(TIM2, ENABLE);//′ò¿a¶¨ê±Æ÷
       
        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  //TIM2ÖD¶Ï
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏèÕ¼óÅÏ輶0¼¶
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  //′óóÅÏ輶3¼¶
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
        NVIC_Init(&NVIC_InitStructure);  //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷

        TIM_Cmd(TIM2, ENABLE);  //ê1ÄüTIMxíaéè
                                                         
}


void OCTiming_GPIO_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
}


void TIM2_IRQHandler(void)
{
        static u16 capture = 0;
        if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//êä3ö±è½Ïí¨μà1
        {
                TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);

                GPIO_WriteBit(GPIOA, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_6)));//·-×aμçƽÖμ
                capture2 = TIM_GetCapture1(TIM2);//»ñ衱è½ÏÖμ
                TIM_SetCompare1(TIM2, capture2 + 3600);//ÖØDÂéèÖñè½ÏÖμ
        }
        if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//êä3ö±è½Ïí¨μà1
        {
                TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);

                GPIO_WriteBit(GPIOA, GPIO_Pin_7, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_7)));//·-×aμçƽÖμ
                capture = TIM_GetCapture2(TIM2);//»ñ衱è½ÏÖμ
                TIM_SetCompare2(TIM2, capture + 3600);//ÖØDÂéèÖñè½ÏÖμ
        }
       
}