PWM波形出错，大神救救我吧！

Vicky

/**
  ******************************************************************************
  * @file    bsp_pwm_output.c
  * @author  STMicroelectronics
  * @version V1.0
  * @date    2013-xx-xx
  * @brief   tim3êä3öËÄ·pwm bsp
  ******************************************************************************
  * @attention
  *
  * êμÑéƽì¨:ò°»e iSO STM32 ¿a·￠°å
  * ÂÛì3    :http://www.firebbs.cn
  * ìÔ±|    :http://firestm32.taobao.com
  *
  ******************************************************************************
  */
  
#include "bsp_pwm_output.h"

/**
  * @brief  ÅäÖÃTIM3¸′óÃêä3&#246WMê±óÃμ½μÄI/O
  * @param  ÎT
  * @retval ÎT
  */
static void TIM3_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

        /* éèÖÃTIM3CLK Îa 72MHZ */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  /* GPIOA and GPIOB clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

  /*GPIOA Configuration: TIM3 channel 1 and 2 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                    // ¸′óÃíÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*GPIOB Configuration: TIM3 channel 3 and 4 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

/**
  * @brief  ÅäÖÃTIM3êä3öμ&#196WMDÅoÅμÄÄ￡ê½￡¬èçÖüÆú¡￠¼«DÔ¡￠Õ¼¿Õ±è
  * @param  ÎT
  * @retval ÎT
  */
/*
* TIMxCLK/CK_PSC --> TIMxCNT --> TIMx_ARR --> TIMxCNT ÖØD¼Æêy
*                    TIMx_CCR(μçƽ·￠éú±ä»ˉ)
* DÅoÅÖüÆú=(TIMx_ARR +1 ) * ê±ÖóÖüÆú
* Õ¼¿Õ±è=TIMx_CCR/(TIMx_ARR +1)
*/
static void TIM3_Mode_Config(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;

        /* PWMDÅoÅμçƽìø±äÖμ */
         u16 CCR1_Val = 500;        
         u16 CCR2_Val = 375;
         u16 CCR3_Val = 250;
         u16 CCR4_Val = 125;

/* -----------------------------------------------------------------------
    TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR+1)* 100% = 50%
    TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR+1)* 100% = 37.5%
    TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR+1)* 100% = 25%
    TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR+1)* 100% = 12.5%
  ----------------------------------------------------------------------- */

  /* Time base configuration */                 
  TIM_TimeBaseStructure.TIM_Period = 999;       //챶¨ê±Æ÷′ó0¼Æêyμ½999￡¬¼′Îa1000′Î￡¬Îaò»¸ö¶¨ê±ÖüÆú
  TIM_TimeBaseStructure.TIM_Prescaler = 0;            //éèÖÃÔ¤·ÖÆμ￡o2»Ô¤·ÖÆμ￡¬¼′Îa72MHz
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //éèÖÃê±Öó·ÖÆμÏμêy￡o2»·ÖÆμ(ÕaàïóÃ2»μ½)
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //ÏòéϼÆêyÄ￡ê½
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //ÅäÖÃÎaPWMÄ￡ê½1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;        
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //éèÖÃìø±äÖμ￡¬μ±¼ÆêyÆ÷¼Æêyμ½Õa¸öÖμê±￡¬μçƽ·￠éúìø±ä
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //챶¨ê±Æ÷¼ÆêyÖμD¡óúCCR1_Valê±Îa¸ßμçƽ
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);         //ê1Äüí¨μà1
  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //éèÖÃí¨μà2μÄμçƽìø±äÖμ￡¬êä3öáííaò»¸öÕ¼¿Õ±èμ&#196WM
  TIM_OC2Init(TIM3, &TIM_OCInitStructure);          //ê1Äüí¨μà2
  TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;        //éèÖÃí¨μà3μÄμçƽìø±äÖμ￡¬êä3öáííaò»¸öÕ¼¿Õ±èμ&#196WM
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);         //ê1Äüí¨μà3
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;        //éèÖÃí¨μà4μÄμçƽìø±äÖμ￡¬êä3öáííaò»¸öÕ¼¿Õ±èμ&#196WM
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);        //ê1Äüí¨μà4
  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM3, ENABLE);                         // ê1ÄüTIM3ÖØÔؼÄ′æÆ÷ARR

  /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);                   //ê1Äü¶¨ê±Æ÷3        
}

/**
  * @brief  TIM3 êä3&#246WMDÅoÅ3õê¼»ˉ￡¬Ö»òaμ÷óÃÕa¸öoˉêy
  *         TIM3μÄËĸöí¨μà¾í»áóDPWMDÅoÅêä3ö
  * @param  ÎT
  * @retval ÎT
  */
void TIM3_PWM_Init(void)
{
        TIM3_GPIO_Config();
        TIM3_Mode_Config();        
}

/*********************************************END OF FILE**********************/




这程序没错啊，为什么我用软件仿真，出来的波形都是一条直线啊，全为低电平？？？？到底为什么啊啊啊啊啊？？？？？？？？？？？？？？？？？

Vicky

有时出来正确波形，有时又不对，可是都是原来的程序怎么回事？？

Vicky

Vicky 发表于 2015-9-25 11:33
有时出来正确波形，有时又不对，可是都是原来的程序怎么回事？？

现在波形正常了，可是为什么把占空比改了，异步电机就不动了啊？？？？？
u16 CCR3_Val = 250;改成了u16 CCR3_Val = 500;