F405RG 使用TIM12编码器输入捕获CNT值为零

15025420415 · 发表于 2020-5-11 19:03:59

有两个编码器，已经使用TIM8读取其中一个编码器数据正常，TIM12 CNT一直为零，排除硬件原因，用示波器可以在TIM12的复用端口PB14/15处看到方波脉冲，代码如下：
/**************************************************************************
*函数名：Encoder_Init_TIM12
*功能：初始化定时器12为编码器模式
*return：无
*parameter：无
**************************************************************************/
void Encoder_Init_TIM12(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

/*TIM12，GPIOB时钟开启*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM12, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

/*PB14/15复用TIM12 CH1/2*/
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_TIM12);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_TIM12);

/*GPIO初始化*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/*TIM初始化*/
TIM_DeInit(TIM12);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM12, &TIM_TimeBaseStructure);

/*编码器模式配置*/
TIM_EncoderInterfaceConfig(TIM12, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter = 10;
TIM_ICInit(TIM12, &TIM_ICInitStructure);

/*中断配置*/
NVIC_InitStructure.NVIC_IRQChannel = TIM8_BRK_TIM12_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM12, TIM_IT_Update, ENABLE);
TIM_ClearFlag(TIM12, TIM_FLAG_Update);

TIM_SetCounter(TIM12, 0);

TIM_Cmd(TIM12, ENABLE); //使能定时器
}
中断函数为空函数未作任何处理，当改为定时时能够按照设置时间正常定时进入中断，但输入捕获编码器时，TIM12->CNT一直为零。
调试无望，烦请各位大佬帮忙看看，谢谢谢谢啦！！！