[mw_shl_code=c,true]void TIM2_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能GPIOB时钟
GPIO_StructInit(&GPIO_InitStructure);//将GPIO_InitStruct中的参数按缺省值输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//PA6 PA7浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// NVIC_Configuration();
TIM_DeInit(TIM2);
TIM_TimeBaseStructure.TIM_Period=65535; //1s /* 自动重装载寄存器周期的值(计数值) */
/* 累计 TIM_Period个频率后产生一个更新或者中断 */
TIM_TimeBaseStructure.TIM_Prescaler= 0; /* 时钟预分频数 72M/72 */
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; /* 采样分频 */
// TIM_TimeBaseStructure.TIM_ClockDivision=0;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; /* 向上计数模式 */
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); //编码器工作模式
// TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
// TIM_ETRConfig(TIM2,TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_ICStructInit(&TIM_ICInitStructure);//将结构体中的内容缺省输入
TIM_ICInitStructure.TIM_ICFilter = 6; //选择输入比较滤波器
TIM_ICInit(TIM2, &TIM_ICInitStructure);//将TIM_ICInitStructure中的指定参数初始化TIM2
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_SetCounter(TIM2, 0);
TIM_Cmd(TIM2, ENABLE); /* 开启时钟 */
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}[/mw_shl_code]
上面是我调试成功的代码，但是我有两个问题没搞明白，求助
1、
[mw_shl_code=c,true]TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); //编码器工作模式[/mw_shl_code]
这个程序中如果我只设置TI1，最后一个参数应该是什么？
2、
[mw_shl_code=c,true]#define TIM_ICPolarity_Rising ((uint16_t)0x0000)
#define TIM_ICPolarity_Falling ((uint16_t)0x0002)
#define TIM_ICPolarity_BothEdge ((uint16_t)0x000A)
#define IS_TIM_IC_POLARITY(POLARITY) (((POLARITY) == TIM_ICPolarity_Rising) || \
((POLARITY) == TIM_ICPolarity_Falling))
#define IS_TIM_IC_POLARITY_LITE(POLARITY) (((POLARITY) == TIM_ICPolarity_Rising) || \
((POLARITY) == TIM_ICPolarity_Falling)|| \
((POLARITY) == TIM_ICPolarity_BothEdge)) [/mw_shl_code]
[mw_shl_code=c,true]TIM_ICPolarity_Rising 和 TIM_ICPolarity_BothEdge 的区别具体体现在什么地方？ [/mw_shl_code] | 
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发表于 2015-8-26 16:51:53
发表于 2015-8-26 19:48:06
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