stm32103vc 输出pwm频率与实际相差10倍

简_单

stm32103vc 输出pwm频率与实际相差10倍，我用keil仿真是正常的，有没有遇到过同样问题的void TIM2_PWM_Init(u16 arr,u16 psc){  
        GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;


        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);        //ê1Äü¶¨ê±Æ÷2ê±Öó
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  , ENABLE);  //ê1ÄüGPIOíaéèoíAFIO¸′óÃ1|ÄüÄ￡¿éê±Öó
          

   //éèÖøÃòy½ÅÎa¸′óÃêä3ö1|Äü,êä3öTIM2 CH1μ&#196WMÂö3å2¨DΠ       GPIOA.0
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //TIM_CH1
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIO

   //3õê¼»ˉTIM2
        TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔؼÄ′æÆ÷ÖüÆúμÄÖμ
        TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ
        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

        //3õê¼»ˉTIM2 Channel2 PWMÄ￡ê½         
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //Ñ¡Ôñ¶¨ê±Æ÷Ä￡ê½:TIMÂö3å¿í¶èμ÷ÖÆÄ￡ê½2
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±è½Ïêä3öê1Äü
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //êä3ö¼«DÔ:TIMêä3ö±è½Ï¼«DÔ¸ß
        TIM_OC1Init(TIM2, &TIM_OCInitStructure);  //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM2 OC1

        TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);  //ê1ÄüTIM2ÔúCCR1éÏμÄԤװÔؼÄ′æÆ÷

        TIM_Cmd(TIM2, ENABLE);  //ê1ÄüTIM2


}

主函数中调用
        TIM2_PWM_Init(899,0);         //
        TIM_SetCompare1(TIM2,500);       

简_单

找到原因了 ！是晶振没有起作用导致的

rst2550478

简_单 发表于 2016-10-25 12:17
找到原因了 ！是晶振没有起作用导致的

怎么让晶振起作用   我的也是这个问题 还没搞出来 求分享