STM32PWM产生30K以上的频率就不行了，大家给看看程序！！（已解决）

看不透说不穿提问时间：2013-8-29 17:16 /

void TIM4_PWM_init(CHn ch, u32 freq, u32 duty)
{
TIM_TimeBaseInitTypeDef TIM4_TimeBaseStructure;//¶¨Òå½á¹¹Ìå
TIM_OCInitTypeDef TIM4_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);//Ê¹ÄÜGPIOD¼°¹¦ÄÜ¸´ÓÃIOÊ±ÖÓ
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);//Ê¹ÄÜTIM4Ê±ÖÓ
//GPIOAÅäÖÃÎª£º¶¨Ê±Æ÷4µÄPWM4¸öÍ¨µÀ¸´ÓÃ¹¦ÄÜÊä³ö
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//I/OÊ±ÖÓÎª50MHz
GPIO_Init(GPIOD, &GPIO_InitStructure);//¸ù¾ÝÉÏÃæÖ¸¶¨²ÎÊý³õÊ¼»¯GPIO½á¹¹Ìå

GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //½«TIM4Òý½ÅÍêÈ«ÖØÓ³Éä
//¶¨Ê±Æ÷»ù±¾ÅäÖÃ
TIM4_TimeBaseStructure.TIM_Period =(u16)(36000000/freq-1);//¼ÆÊýÖµÎª1000
TIM4_TimeBaseStructure.TIM_Prescaler = 2-1;//2·ÖÆµ 36M
TIM4_TimeBaseStructure.TIM_ClockDivision = 0;//²ÉÑù·ÖÆµ0
TIM4_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//ÏòÉÏ¼ÆÊý
TIM_TimeBaseInit(TIM4, &TIM4_TimeBaseStructure);
TIM4_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//¶¨Ê±Æ÷ÅäÖÃÎªPWM1Ä£Ê½
TIM4_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//TIMÊä³ö±È½Ï¼«ÐÔ¸ß
// PWM1Ä£Ê½Í¨µÀ1
if(ch==1)
{
TIM4_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//Í¨µÀ1Êä³öÊ¹ÄÜ
TIM4_OCInitStructure.TIM_Pulse =(u16)(36000000/freq/PWM_precision*duty);//Âö¿íÖµÎª200
TIM_OC1Init(TIM4,&TIM4_OCInitStructure); //¸ù¾ÝTIM_OCInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯TIM2
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //Ê¹ÄÜTIM2ÔÚCCR1ÉÏµÄÔ¤×°ÔØ¼Ä´æÆ÷
}
// PWM1Ä£Ê½Í¨µÀ2
if (ch==2)
{
TIM4_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM4_OCInitStructure.TIM_Pulse =(u16)(36000000/freq/PWM_precision*duty);//Âö¿íÖµÎ
TIM_OC2Init(TIM4, &TIM4_OCInitStructure);
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);//Ê¹ÄÜTIM2ÔÚCCR2ÉÏµÄÔ¤×°ÔØ¼Ä´æÆ÷
}
// PWM1Ä£Ê½Í¨µÀ3
if (ch==3)
{
TIM4_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM4_OCInitStructure.TIM_Pulse =(u16)(36000000/freq/PWM_precision*duty);
TIM_OC3Init(TIM4, &TIM4_OCInitStructure);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
}
// PWM1Ä£Ê½Í¨µÀ4
if (ch==4)
{
TIM4_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM4_OCInitStructure.TIM_Pulse =(u16)(36000000/freq/PWM_precision*duty);
TIM_OC4Init(TIM4, &TIM4_OCInitStructure);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
}
TIM_ARRPreloadConfig(TIM4, ENABLE);//Ê¹ÄÜTIM2ÔÚARRÉÏµÄÔ¤×°ÔØ¼Ä´æÆ÷
TIM_ClearITPendingBit(TIM4, TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4);//Ô¤ÏÈÇå³ýËùÓÐÖÐ¶ÏÎ»
/* ÅäÖÃÊä³ö±È½ÏÍ¨µÀ1ÖÐ¶Ï*/
TIM_ITConfig(TIM4,TIM_IT_CC1,DISABLE);

TIM_Cmd(TIM4, ENABLE);//Ê¹ÄÜ¶¨Ê±Æ÷2
}

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3个回答

feiante-155820 回答时间：2013-8-30 08:16:53

RE:STM32PWM产生30K以上的频率就不行了，大家给看看程序！！

产生30K以上的波不行是什么意思？
下面是我产生38KHz，占空比为1/3的程序，你可以看看
void TIM1_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;       //Õâ¾ä±ØÐë·ÅÔÚ×îÉÏÃæ
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 1894;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  /* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1894/3;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE);
  /* TIM1 enable counter */
TIM_Cmd(TIM1, DISABLE);

TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

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feiante-155820 回答时间：2013-8-30 08:17:18

RE:STM32PWM产生30K以上的频率就不行了，大家给看看程序！！

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fengye5340 回答时间：2013-8-30 10:30:11

回复:STM32PWM产生30K以上的频率就不行了，大家给看看程序！！

看你的代码好费劲，发一个我的吧，默认50KHZ,可以随意设置频率和占空比，楼主可以参考一下：这个代码已经验证：

extern unsigned char Pwm_freg ;
unsigned char Pwm_duty_num =20 ; // 50kHZ
extern volatile unsigned short int Pwm_period_num ;
unsigned short int CCR1_Val;
unsigned short int CCR2_Val;
//unsigned short int CCR3_Val = 50;
//unsigned short int CCR4_Val = 20;
/*******************************************************************************
* 函数名称: Timer3_PWM_Init();
* 功能描述: 定时器3初始化--用于产生四路PWM
* 输入参数: void
* 返回参数: 无
********************************************************************************/
void Timer3_PWM_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef      TIM_TimeBaseInitStructure;
          TIM_OCInitTypeDef TIM_OCInitStructure;


          CCR1_Val = (unsigned short int)(50*(Pwm_period_num+1)/100);
          CCR2_Val = (unsigned short int)(50*(Pwm_period_num+1)/100);

          //时钟配置
          RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE , ENABLE);   // 使能GPIOB端口
          RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);   // 打开定时器3的时钟

          //TIM3-CH1-CH4GPIO通道配置--PE2-PE5
          GPIO_InitStructure.GPIO_Pin =   GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
                GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
                GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
                GPIO_Init(GPIOE, &GPIO_InitStructure);

        GPIO_PinAFConfig(F303C_PWM3_CH1_P0RT , F303C_PWM3_CH1_SOURCE, F303C_PWM3_CH1_AF);
                GPIO_PinAFConfig(F303C_PWM3_CH2_P0RT , F303C_PWM3_CH2_SOURCE, F303C_PWM3_CH2_AF);
                GPIO_PinAFConfig(F303C_PWM3_CH3_P0RT , F303C_PWM3_CH3_SOURCE, F303C_PWM3_CH3_AF);
          GPIO_PinAFConfig(F303C_PWM3_CH4_P0RT , F303C_PWM3_CH4_SOURCE , F303C_PWM3_CH4_AF);

          //设置定时器相关参数
          TIM_TimeBaseInitStructure.TIM_Prescaler = 71;                  // 定时器时钟分频后: 72000000 / (72 + 1) = 1MHZ.
          TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // 向上计数模式
          TIM_TimeBaseInitStructure.TIM_Period = Pwm_period_num ;         // 自动重装载计数器周期的值--默认50KHZ
          TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;     // 时钟分频系数--不分频
          TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);             // TIM2, 每1ms中断一次.

        //PWM模式设置-CH3
                TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
                TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
        TIM_OC3Init(TIM3, &TIM_OCInitStructure);
        TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

                //PWM模式设置-CH4
                TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
                TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
                TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
        TIM_OC4Init(TIM3, &TIM_OCInitStructure);
                TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

                TIM_ARRPreloadConfig(TIM3, ENABLE);
          TIM_Cmd(TIM3, ENABLE);
}

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