各位高手好，我想对电机的正反转进行计数，所以设计了一块带STM32F407的计数板，想用其中的定时器正交编码接口模式进行计数，因为没有用过单片机，所以很多东西不懂，自己参考别人的改了一个程序，但编译不过去，所以在这里想请教各位。
void Tim_Init(void) {              void gpio_init(void);     TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;             TIM_ICInitTypeDef TIM_ICInitStructure;             Tim_Nvic_Init();     gpio_init();             RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);      //    TIM3 clock enable      /* Compute the prescaler value */             PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 6000000) - 1;    /* Time base configuration */             TIM_TimeBaseStructure.TIM_Period = 65535;             TIM_TimeBaseStructure.TIM_Prescaler = 0;             TIM_TimeBaseStructure.TIM_ClockDivision = 0;             TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;             TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);     /* Prescaler configuration */              TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);          /* Timer configuration in Encoder mode */       TIM_DeInit(ENCODER_TIMER);              TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);             TIM_TimeBaseStructure.TIM_Prescaler = 0x0;  // No prescaling               TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD;                 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); //TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;       TIM_ICStructInit(&TIM_ICInitStructure);       TIM_ICInitStructure.TIM_ICFilter = 15;       TIM_ICInit(TIM3, &TIM_ICInitStructure);  // Clear all pending interrupts       TIM_ClearFlag(TIM3, TIM_FLAG_Update|TIM_IT_CC1|TIM_IT_CC2);       TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);   //TIM_ITConfig(TIM4, TIM_FLAG_Update, ENABLE);   //Reset counter       TIM4->CNT=0x8000;     /* TIM3 enable counter */             TIM_Cmd(TIM3, ENABLE);         }
void gpio_init(void) { GPIO_InitTypeDef  GPIO_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); //Connect TIM3 Pin to AF2 GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_TIM3);  //TIM3_Ch1 GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_TIM3);  //TIM3_Ch2 /* Configure PB.04,05 as encoder input */           GPIO_InitStructure.GPIO_Pin=(GPIO_Pin_4|GPIO_Pin_5);           GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;                 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;  GPIO_Init(GPIOB, &GPIO_InitStructure); }