使用TIM2的CH1和CH2捕获编码器脉冲，CH3和CH4输出PWM的问题

slim素 · 发表于 2017-1-2 19:06:58

使用TIM2的CH1和CH2捕获编码器脉冲，CH3和CH4输出PWM的时候，捕获值不能正常输出，且PWM输出几秒后会被卡死；
是不是同一个定时器的时基不能同时用作输入捕获和输出PWM呀？

下面是TIM3的PWM输出配置，单独运行时正常。
void TIM3_Config(void) //TIM3的GPIO和时基配置
{
GPIO_InitTypeDef  GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

/* GPIOA */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; //íÆíìêä3ö
GPIO_Init(GPIOA,&GPIO_InitStructure);

/* GPIOB */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
GPIO_Init(GPIOB,&GPIO_InitStructure);

/* TIM3_TimeBase :2»·ÖÆμ,′ó 0 ¿aê¼¼Æêyμ½ arr òç3ö; ¼Æêy·½ê½￡oÏòéÏ¼Æêy  */
/* ÆμÂê72000 000/7200=10KHz */

TIM_TimeBaseStructure.TIM_Prescaler=0;               //Ô¤·ÖÆμÆ÷
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period=arr;
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
}

void PWM_Set(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;

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=3600;
TIM_OC3Init(TIM3,&TIM_OCInitStructure); //TIM3_CH3
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_Pulse=3600;
TIM_OC4Init(TIM3,&TIM_OCInitStructure); //TIM3_CH4
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_Cmd(TIM3,ENABLE);
}

下面是TIM3编码器捕获的配置：注释了TIM3捕获配置部分时候运行正常，不注释TIM3的时候运行出错
void Capture_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

/*GPIO Configured*/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA,&GPIO_InitStructure);

/*TIM_TimeBase Configured*/
TIM_TimeBaseStructure.TIM_Prescaler=0;               //Ô¤·ÖÆμÆ÷
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //ÏòéÏ¼ÆêyÄ￡ê½
  TIM_TimeBaseStructure.TIM_Period=arr;       //¼ÆêyÖüÆú
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;    //ê±Öó2»·ÖÆμ

TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);

/*TIM_TimeBase Configured*/
TIM_TimeBaseStructure.TIM_Prescaler=0;
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period=arr;
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI12, TIM_ICPolarity_BothEdge, TIM_ICPolarity_BothEdge);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter=6;
TIM_ICInit(TIM2, &TIM_ICInitStructure);

TIM_ClearFlag(TIM2, TIM_FLAG_Update);
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  //Reset counter
  TIM_SetCounter(TIM2,0);
  TIM_Cmd(TIM2, ENABLE);

TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI12, TIM_ICPolarity_BothEdge, TIM_ICPolarity_BothEdge);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter=6;
TIM_ICInit(TIM3,&TIM_ICInitStructure);

TIM_ClearFlag(TIM3, TIM_FLAG_Update);
  TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
//Reset counter
  TIM_SetCounter(TIM3,0);
  TIM_Cmd(TIM3, ENABLE);
}