本帖最后由 tommorow 于 2015-12-8 13:17 编辑

最近在用定时器实现编码器功能，然后tim2与tim5的io是一样的，就要用到afio，结果找了些资料，写了代码，发现定时器复用并没有实现。。。这代码是将tim2_ch1和ch2从PA0和PA1重映射到PA15和PB3，而计数器没有计数。。后来把代码里的tim2换成了tim3，从PA6PA7重映射到PC6PC7，然后测试结果是可以计数，于是就不理解，难道是tim2复用这部分有问题？


编码器的配置代码
void encoder_Count_Init(void )
{
        TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
        TIM_ICInitTypeDef TIM_ICInitStructure;
        // Encoder unit connected to TIM3, 4X mode
        GPIO_InitTypeDef GPIO_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
        
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
        // Enable GPIOA, clock
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);
        GPIO_PinRemapConfig(GPIO_FullRemap_TIM2,ENABLE);
        GPIO_StructInit(&GPIO_InitStructure);
        
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_Init(GPIOB, &GPIO_InitStructure);
        
        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
        
        TIM_DeInit(ENCODER_TIMER);
        TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
        TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
        TIM_TimeBaseStructure.TIM_Period = 20000;
        TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);
        ////////////////////////////////////////////////////////////////////
        TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
        TIM_ICStructInit(&TIM_ICInitStructure);        
        //TIM_ICInitStructure.TIM_ICFilter = ICx_FILTER;
        TIM_ICInit(ENCODER_TIMER, &TIM_ICInitStructure);
        // Clear all pending interrupts
        TIM_ClearFlag(ENCODER_TIMER, TIM_FLAG_Update);
        TIM_ITConfig(ENCODER_TIMER, TIM_IT_Update, DISABLE);
        //Reset counter
        ENCODER_TIMER->CNT = 0;
        // ENC_Clear_Speed_Buffer();
        TIM_Cmd(ENCODER_TIMER, ENABLE);
}


















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