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楼主 |
发表于 2014-1-21 09:35:26
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回复【3楼】正点原子:
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代码如下:可是用串口打印出来的数据显然超过了65536了,什么原因?这里只选用了一个通道
void Tim_Pwm_In_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//?
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_DeInit(TIM4);
TIM_TimeBaseStructure.TIM_Period = 0xffff;
//CLK = 72000000/TIM_Prescaler
TIM_TimeBaseStructure.TIM_Prescaler=71;//
//set clock division
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //or TIM_CKD_DIV2 or TIM_CKD_DIV4
//count up
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);
//?¨??1
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInit(TIM4, &TIM_ICInitStructure);
void Tim4_Pwm_In_Irq(void)
{
static u16 temp_cnt1,temp_cnt1_2,temp_cnt2,temp_cnt2_2,temp_cnt3,temp_cnt3_2,temp_cnt4,temp_cnt4_2;
//
if(TIM4->SR & TIM_IT_CC1)//if(TIM_GetITStatus(TIM2, TIM_IT_CC1) == SET)//
{
u16 ccr1 = TIM4->CCR1; //?????¨??1????
TIM4->SR &= ~TIM_FLAG_CC1OF;
if(GPIOB->IDR & GPIO_Pin_6)
{/
temp_cnt1 = ccr1;
printf("temp_cnt1=%d\n",temp_cnt1);
TIM4->CCER |= (1<<1); //CC1P=1,
}
else
{
temp_cnt1_2 = ccr1;
printf("temp_cnt2=%d\n",temp_cnt2);
TIM4->CCER &= ~(1<<1);//
if(temp_cnt1_2>=temp_cnt1)
{Rc_Pwm_In[0] = temp_cnt1_2-temp_cnt1;
printf("?¨??1====%d\n",Rc_Pwm_In[0]);}
else
{Rc_Pwm_In[0] = 0xffff-temp_cnt1+temp_cnt1_2;//
printf("?¨??1====%d\n",Rc_Pwm_In[0]);}
}
} |
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