求助 TIM3定时器产生PWM 通过上位机修改频率输出异常

tiantianjia · 发表于 2017-12-19 14:39:47

我现在用STM32F101C8 TIM3  1通道的定时器产生PWM  能过上位机来修改PWM的频率  较高频率时有输出  但发现不正常  象是一直在配置    比如1K 较低频率时比如50HZ  则没有输出  只能抓到一些脉冲    当我在配置完后加较大的延迟  则会有输出  频率也对  但好象也在一直配置刷新我直接贴代码麻烦大家看看原子也看看  求教

int main(void)
{

RCC_Configuration(); //éèÖÃÏμí3ê±ÖóÎa72MHZ(Õa¸ö¿éòÔ¸ù¾YDèòa¸Ä)
    NVIC_Configuration(); //STM32ÖD¶ÏÏòá¿±íÅäÅäÖÃ
delay_init();
//  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //éèÖÃNVICÖD¶Ï·Ö×é2:2Î»ÇàÕ¼óÅÏè¼¶￡¬2Î»Ïìó|óÅÏè¼¶
RS422_Init(115200);
// delay_ms(1);

PD_Init();
   EB_Init();
   DIR_Init();
   DETECT_1_Init();
   DETECT_2_Init();

TIM3_PWM_Init(2500,144-1); //2úéú20KHz μ&#196

WM
   TIM_SetCompare1(TIM3,1250);    //Õ¼¿Õ±è¿ØÖÆ
TIM_Cmd(TIM3,ENABLE);

while (1)
{
       DATA_CTL();
////    STATE_TEMP1 = GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14);
//// STATE_TEMP2 = GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15);
if(ts_buf[1] == 0x01)
GPIO_ResetBits(GPIOA,GPIO_Pin_1);
      if (ts_buf[2] == 0x01)
         GPIO_SetBits(GPIOA,GPIO_Pin_1);
         if (ts_buf[3] == 0x01)
        GPIO_SetBits(GPIOA,GPIO_Pin_2);
            if (ts_buf[3] == 0x02)
         GPIO_ResetBits(GPIOA,GPIO_Pin_2);
      if(ts_buf[4] == 0x01)
      {
      STATE_TEMP1 = GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14);
      STATE_TEMP2 = GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15);
      if(STATE_TEMP1 == 0)
      GPIO_SetBits(GPIOA,GPIO_Pin_1);
   if(STATE_TEMP2 == 0)
      GPIO_ResetBits(GPIOA,GPIO_Pin_2);
   if(STATE_TEMP1 == 1)
   GPIO_ResetBits(GPIOA,GPIO_Pin_1);
   if(STATE_TEMP2 == 1)
      GPIO_ResetBits(GPIOA,GPIO_Pin_2);
      }
//
fre_1 = ts_buf[5];
fre_2 = ts_buf[6];
fre_3 = ts_buf[7];
data_mid = ((u32)fre_1 << 16) | ((u32)fre_2 << 8) | ((u32)fre_3);
//

//    delay_ms(10);
fre_set = (u16)(0x3D090 / data_mid);
fre_set_1 = fre_set;
fre_zkb = (u16)(fre_set/2);
fre_zkb_1 = fre_zkb;

// SetValue1(fre_zkb_1,fre_set_1);
// // delay_ms(100);
// //TIM_SetAutoreload(TIM3,fre_set);
TIM3_PWM_Init(fre_set_1-1,144-1); //2úéú20KHz μ&#196

WM
//delay_ms(10);
   TIM_SetCompare1(TIM3,fre_zkb_1);    //Õ¼¿Õ±è¿ØÖÆ
delay_ms(2000);

// TIM_Cmd(TIM3,DISABLE);
//
//       if(STATE_TEMP1 == 0)
//          GPIO_SetBits(GPIOA,GPIO_Pin_2);
//          if(STATE_TEMP2 == 0)
//         GPIO_ResetBits(GPIOA,GPIO_Pin_2);
// delay_ms(1000);


}
}

void  DATA_CTL(void)
{
u8 *p;
u8 a = 7;
p = &a;
// delay_ms(300);
RS422_Receive_Data(rs_buf, p);

if((rs_buf[0] == 0x0a)&&(rs_buf[8] == 0x0b))
{
   ts_buf[0] = rs_buf[0];
   ts_buf[1] = rs_buf[1];
   ts_buf[2] = rs_buf[2];
    ts_buf[3] = rs_buf[3];
    ts_buf[4] = rs_buf[4];
    ts_buf[5] = rs_buf[5];
   ts_buf[6] = rs_buf[6];
   ts_buf[7] = rs_buf[7];
    ts_buf[8] = rs_buf[8];
}
else
{
ts_buf[0] = 0;
    ts_buf[1] = 0;
    ts_buf[2] = 0;
    ts_buf[3] = 0;
    ts_buf[4] = 0;
   ts_buf[5] = 0;
   ts_buf[6] = 0;
    ts_buf[7] = 0;
    ts_buf[8] = 0;
}

}

下面是TIM的配置
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

// TIM_DeInit(TIM3);
// TIM_InternalClockConfig(TIM3);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê1Äü¶¨ê±Æ÷3ê±Öó
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);  //ê1ÄüGPIOíaéèoíAFIO¸′óÃ1|ÄüÄ￡¿éê±Öó

//TIM_InternalClockConfig(TIM3);
//GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer32¿·ÖÖØó3éä  TIM3_CH2->

B5

//éèÖÃ¸Ãòy½ÅÎa¸′óÃêä3ö1|Äü,êä3öTIM3 CH2μ&#196

WMÂö3å2¨DÎ GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIO
// GPIO_SetBits(GPIOA,GPIO_Pin_7);
//3õê¼»ˉTIM3
TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂêÂ¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′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;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

//3õê¼»ˉTIM3 Channel2 PWMÄ￡ê½
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //Ñ¡Ôñ¶¨ê±Æ÷Ä￡ê½:TIMÂö3å¿í¶èμ÷ÖÆÄ￡ê½2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±è½Ïêä3öê1Äü
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //êä3ö¼«DÔ:TIMêä3ö±è½Ï¼«DÔ¸ß
TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM3 OC2

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //ê1ÄüTIM3ÔúCCR2éÏμÄÔ¤×°ÔØ¼Ä′æÆ÷
TIM_ARRPreloadConfig(TIM3, ENABLE);
//TIM_CtrlPWMOutputs(TIM3,ENABLE);
//TIM_GenerateEvent(TIM3,TIM_EventSource_Update);

TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIM3

}

//void SetValue1(u16 g,u16 arr)
//{
// //¸ù¾YÑÕé«ÖμDT¸Ä¶¨ê±Æ÷μÄ±è½Ï¼Ä′æÆ÷Öμ
//
// TIM3->CCR1 = g;

//  TIM3->ARR = arr;
//
//}

//¶¨ê±Æ÷3ÖD¶Ï·tÎñoˉêy
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //òç3öÖD¶Ï
{
// PWM=!PWM;
}
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);  //Çå3yÖD¶Ï±êÖ¾Î»
}