void TIM2_EncoderMode_PA15_PB3_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_ICInitTypeDef TIM_ICInitStructure;

//TIM_OCInitTypeDef  TIM_OCInitStructure;

/*----------------------------------------------------------------*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_StructInit(&GPIO_InitStructure);

/* Configure PA15 encoder input */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15 ;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_StructInit(&GPIO_InitStructure);

/* Configure PB3 as encoder input */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOB, &GPIO_InitStructure);

/*----------------------------------------------------------------*/

//

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能

TIM_DeInit(TIM2);

GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);//禁用JTAG，由于PA15是JTAG引脚

GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 0xffff;      //

TIM_TimeBaseStructure.TIM_Prescaler = 0;           //设置预分频：

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;       //设置时钟分频系数：不分频

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/*-----------------------------------------------------------------*/

//编码配置                        编码模式

TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); //TIM_ICPolarity_Rising上升沿捕获

TIM_ICStructInit(&TIM_ICInitStructure);

TIM_ICInitStructure.TIM_ICFilter = 6;         //比较滤波器

TIM_ICInit(TIM2, &TIM_ICInitStructure);

TIM2->CNT = 0;

TIM_Cmd(TIM2, ENABLE);   //使能定时器2

}