STM32怎么实现精确控制PWM输出数量同时能改变频率？-电子陌离的回答

8条回答

2019-07-22 06:42

本帖最后由电子陌离于 2018-12-12 10:23 编辑

//看看对你有用不，DutyCycle：占空比 Frequency：频率 jishu：脉冲输入计数//实测没问题的，我做圆织机的
#include "

WMinput.h"

volatile u16 IC2Value = 0;
volatile u16 DutyCycle = 0;  //Õ¼¿Õ±è
volatile u32 Frequency = 0;  //ÆμÂê
u16  maijishu = 0; //¼ÆËãÂö3å
u32 jishu = 0;    //Âö3å½óêÕ
u32 maicojishu = 0;  //Âö3å½óêÕ
float Duty_ycle = 0;             //Õ¼¿Õ±è
float Freq_ncy = 0;             //ÆμÂê

void PWM_INPUT_Config(void)//PWMêäèë2¶»ñ3õê¼»ˉ
{
            GPIO_InitTypeDef  GPIO_InitStructure;
            NVIC_InitTypeDef  NVIC_InitStructure;
            TIM_ICInitTypeDef TIM_ICInitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
            RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;    //¸¡¿Õêäèë
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//             GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      //       GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
            GPIO_Init(GPIOA,&GPIO_InitStructure);
      GPIO_PinRemapConfig(GPIO_FullRemap_TIM3,ENABLE);
//             GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
//éèÖÃÆμÂê1MHZ,¼ÆË&#227

WMÆμÂêê±òaê1óÃ
            TIM_TimeBaseStructure.TIM_Period = 0xffff;//ÖüÆú0~FFFF
            TIM_TimeBaseStructure.TIM_Prescaler = 72-1;//ê±Öó·ÖÆμ,·ÖÆμêyÎa5+1¼′6·ÖÆμ
            TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//ê±Öó·Ö¸î
            TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//Ä￡ê½
            TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);//»ù±¾3õê¼»ˉ

            NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;//′ò¿aTIM3μÄè«¾ÖÖD¶Ï
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//ÇàÕ¼óÅÏè¼¶Îa0
            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//Ïìó|óÅÏè¼¶Îa1
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  //ê1Äü
            NVIC_Init(&NVIC_InitStructure);

/*ê1ÄüË«±ßÑØ¼ì2a*/
// TIM1->CCER &= (uint16_t)~((uint16_t)TIM_CCER_CC1E);
//             TIM1->CCMR1 |= 0x03;
//             TIM1->SMCR |= (1<<6);
//             TIM1->SMCR &= ~((1<<5)|(1<<4));
//             TIM1->CCER |= ((uint16_t)TIM_CCER_CC1E);

            TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; //Ñ¡Ôñêäèë¶Ë,IC1ó3éäμ½TI1éÏ
            TIM_ICInitStructure.TIM_ICFilter = 0x0;       //ÅäÖÃÂË2¨,2»ÂË2¨
            TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//éÏéyÑØ
            TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //ÅäÖÃ·ÖÆμ,2»·ÖÆμ
            TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//ó3éäμ½TI1éÏ

//             TIM_ITRxExternalClockConfig(TIM3,TIM_TS_ETRF);       //ÅäÖÃía2¿′￥·￠,·ñÔò2»»á¼Æêy
// TIM_ETRClockMode2Config(TIM3, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
//             TIM_ClearITPendingBit(TIM1,TIM_IT_Update); //

            TIM_PWMIConfig(TIM3,&TIM_ICInitStructure); //¸ù¾Y2ÎêyÅäÖÃTIMíaéèDÅÏ￠
            TIM_SelectInputTrigger(TIM3,TIM_TS_TI2FP2);  //Ñ¡ÔñIC2Îaê¼ÖÕ′￥·￠Ô′
            TIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset);//′￥·￠DÅoÅμÄéÏéyÑØÖØDÂ3õê¼»ˉ¼ÆêyÆ÷oí′￥·￠¼Ä′æÆ÷
            TIM_SelectMasterSlaveMode(TIM3,TIM_MasterSlaveMode_Enable);//Æô¶ˉ¶¨ê±Æ÷μÄ±»¶ˉ′￥·￠
            TIM_Cmd(TIM3,ENABLE);                      //Æô¶ˉ¶¨ê±Æ÷3
            TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);       //′ò¿aÖD¶Ï′|àíoˉêy
}
void TIM3_IRQHandler(void)
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);  //Çå3yTIMμÄÖD¶Ï′y′|àíÎ»
            IC2Value = TIM_GetCapture2(TIM3);       //¶áè¡IC22¶»ñ¼Ä′æÆ÷Öμ,¼′ÎaPWMÖüÆú¼ÆêyÖμ
            maijishu = TIM3->SR;
      if(IC2Value != 0)
               {
                     DutyCycle = (TIM_GetCapture1(TIM3) * 100) / IC2Value; //¶áè¡IC12¶»ñ¼Ä′æÆ÷Öμ,2￠¼ÆËãÕ¼¿Õ±è
                     Frequency = 1000000 / IC2Value;             //¼ÆË&#227

WMÆμÂê,1MHZè¡éÏÃæÅäÖÃ
                     Duty_ycle = (float)DutyCycle;
                     Freq_ncy = (float)Frequency;
//                      maijishu = TIM_GetCounter(TIM3);
//                      maijishu = TIM_GetCapture2(TIM3);
               }
            else
               {
                     DutyCycle = 0;
                     Frequency = 0;
                     Freq_ncy = 0;
                     Duty_ycle = 0;
               }
               if(maijishu&0x02)    //·￠éú2¶»ñêÂ¼t
               {
                     jishu++;       //Âö3å¼Æêy2¶»ñéÏéyÑØÂö3åx22ÅêÇêäèëÕæÕyμÄÂö3åêy
                     maicojishu = jishu;
               }
               TIM3->SR = 0;    //Çå3tÖD¶Ï±êÖ¾Î»
      // printf("DutyCycle= %d ",DutyCycle);
      // printf("Frequency= %d ",Frequency);
}

查看其它8个回答

STM32怎么实现精确控制PWM输出数量同时能改变频率？

一周热门更多>

相关问题

相关文章

STM32怎么实现精确控制PWM输出数量同时能改变频率？

打开微信“扫一扫”，打开网页后点击屏幕右上角分享按钮

一周热门 更多>

相关问题

相关文章

采纳回答

编辑标签

举报内容

检举类型

检举原因

检举说明(必填)

打开微信“扫一扫”，打开网页后点击屏幕右上角分享按钮

付费偷看金额在0.1-10元之间

一周热门更多>