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- 18
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- 2019-7-9
- 在线时间
- 8 小时
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10金钱
程序不知道哪里错了,连上信号源后串口打印出来全是0,求大佬帮忙看看
TIM_ICInitTypeDef TIM3_ICInitStructure;
void TIM3_Cap_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); // Time base configuration
TIM_ETRClockMode2Config(TIM3, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_SetCounter(TIM3, 0);
TIM_Cmd(TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
}
void TIM2_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM2_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_DeInit(TIM2);
TIM2_TimeBaseStructure.TIM_Period =2499;
TIM2_TimeBaseStructure.TIM_Prescaler = 7199;
TIM2_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM2_TimeBaseStructure); // Time base configuration
TIM_ClearFlag(TIM2,TIM_FLAG_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );
TIM_Cmd(TIM2, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
u16 count;
int sum;
float Frequency1;
u32 CAPTURE1;
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
CAPTURE1=(u32)TIM_GetCounter(TIM3);
//CAPTURE2=(u32)TIM_GetCounter(TIM4);
}
sum+=CAPTURE1;
count++;
if(count==4)
{
Frequency1=sum/4/0.25;
sum=0;
count=0;
printf("ÆμÂêêÇ£o %f",Frequency1);
printf ("\r\n");
}
TIM_SetCounter(TIM3,0);
}
extern int sum;
extern float Frequency1;
int main(void)
{
delay_init(); //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //éèÖÃNVICÖD¶Ï·Ö×é2:2λÇàÕ¼óÅÏè¼¶£¬2λÏìó|óÅÏè¼¶
uart_init(115200); //′®¿ú3õê¼»ˉÎa115200
LED_Init(); //LED¶Ë¿ú3õê¼»ˉ
TIM3_Cap_Init(0XFFFF,72-1); //òÔ1MhzμÄÆμÂê¼Æêy
TIM2_Int_Init(2499,7199); //4hz
while(1)
{
}
}
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