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- 2014-5-22
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5金钱
各位大侠,我要检测传感器的输出信号,这种传感器输出的是频率,我按照输入捕获例程做了一些修改,还做了一个模拟的传感器信号,信号是500ms高脉冲、500ms低脉冲,如此循环。我如果直接捕获脉宽,是没问题的,高脉冲是500ms,但在做频率的时候,检测到的频率是44Hz,我单步运行时,有时候会出现18Hz、30Hz,甚至是1000000Hz这样的,再或者就是不输出,用的是TIM5_CH1通道,我找不出原因,所以把代码贴出来,请高手不吝赐教。PS:注释是乱码,不知道是怎么回事。
timer.c代码:
#include "timer.h"
#include "led.h"
#include "usart.h"
//?¨ê±?÷5ê?è?2???????
TIM_ICInitTypeDef TIM5_ICInitStructrue;
void TIM5_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE); //ê1?üTIM5ê±?ó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); //ê1?üGPIOAê±?ó
//3?ê??ˉPA0~3
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0; //PA0
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD; //PA0~3ê?è?
GPIO_Init(GPIOA,&GPIO_InitStructure); //3?ê??ˉPA0~3
GPIO_ResetBits(GPIOA,GPIO_Pin_0); //PA0
//3?ê??ˉTIM52?êy
TIM_TimeBaseStructure.TIM_Period=arr; //éè?¨??êy?÷×??ˉ??×°?μ
TIM_TimeBaseStructure.TIM_Prescaler=psc; //?¤·??μ?÷
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //TDTS=Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //TIM?òé???êy?£ê?
TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure); //3?ê??ˉTIMx
//3?ê??ˉ4??í¨μàê±£?òa??D′ò?±é£?2??üê1ó?|£??aê??TD§μ?
//3?ê??ˉTIM5ê?è?2???í¨μà1
TIM5_ICInitStructrue.TIM_Channel=TIM_Channel_1; //CC1S=01£?????ê?è???IC1ó3é?μ?TI1é?
TIM5_ICInitStructrue.TIM_ICPolarity=TIM_ICPolarity_Rising; //é?éy??2???
TIM5_ICInitStructrue.TIM_ICSelection=TIM_ICSelection_DirectTI; //ó3é?μ?TI1é?
TIM5_ICInitStructrue.TIM_ICPrescaler=TIM_ICPSC_DIV1; //????ê?è?·??μ£?′?′|2?·??μ
TIM5_ICInitStructrue.TIM_ICFilter=0x00; //IC1F=0000£?????ê?è???2¨?÷?a2???2¨
TIM_ICInit(TIM5,&TIM5_ICInitStructrue); //3?ê??ˉTIM5ê?è?2???í¨μà1
//3?ê??ˉNVIC?D??ó??è??·?×é
NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn; //TIM5?D??
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2; //?è??ó??è???a2??
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0; //′óó??è???a0??
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; //IRQí¨μà±?ê1?ü
NVIC_Init(&NVIC_InitStructure); //3?ê??ˉNVIC
TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE); //?êDí?üD??D??2????D??
TIM_Cmd(TIM5,ENABLE); //ê1?ü?¨ê±?÷5
}
u8 TIM5CH1_CAPTURE_STA=0; //ê?è?2???×′ì?
u16 TIM5CH1_CAPTURE_VAL; //ê?è?2????μ
u8 TIM5CH2_CAPTURE_STA=0; //ê?è?2???×′ì?
u16 TIM5CH2_CAPTURE_VAL; //ê?è?2????μ
u8 TIM5CH3_CAPTURE_STA=0; //ê?è?2???×′ì?
u16 TIM5CH3_CAPTURE_VAL; //ê?è?2????μ
u8 TIM5CH4_CAPTURE_STA=0; //ê?è?2???×′ì?
u16 TIM5CH4_CAPTURE_VAL; //ê?è?2????μ
//?¨ê±?÷5?D??·t??3ìDò
void TIM5_IRQHandler(void)
{
//ê?è?2???í¨μà1
if((TIM5CH1_CAPTURE_STA&0X80)==0) //?1?′3é1|2???
{
if(TIM_GetITStatus(TIM5,TIM_IT_Update)!=RESET)
{
if(TIM5CH1_CAPTURE_STA&0X40) //ò??-2???μ???μ???
{
if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F) //??μ???ì?3¤á?
{
TIM5CH1_CAPTURE_STA|=0X80; //±ê??3é1|2???á?ò?′?
TIM5CH1_CAPTURE_VAL=0XFFFF;
}
else
TIM5CH1_CAPTURE_STA++;
}
}
if(TIM_GetITStatus(TIM5,TIM_IT_CC1)!=RESET) //2???1·¢éú2???ê??t
{
if(TIM5CH1_CAPTURE_STA&0X40) //2???μ?ò???é?éy??
{
TIM5CH1_CAPTURE_STA|=0X80; //±ê??3é1|2???μ?ò?′?é?éy??
TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0éè???aé?éy??2???
}
else //?1?′?aê?£?μúò?′?2???é?éy??
{
TIM5CH1_CAPTURE_STA=0; //????
//TIM5CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM5,0); //??êy?μ??á?
TIM5CH1_CAPTURE_STA|=0X40; //±ê??2???μ?á?é?éy??
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=1éè???a???μ??2???£?μè′y???μ??μ?à′
}
}
}
//×?oóí3ò???3y4??í¨μà?D??
TIM_ClearITPendingBit(TIM5,TIM_IT_CC1|TIM_IT_Update); //??3y?D??±ê????
}
main.c代码
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
extern u8 TIM5CH1_CAPTURE_STA; //ê?è?2???×′ì?
extern u16 TIM5CH1_CAPTURE_VAL; //ê?è?2????μ
extern u8 TIM5CH2_CAPTURE_STA; //ê?è?2???×′ì?
extern u16 TIM5CH2_CAPTURE_VAL; //ê?è?2????μ
extern u8 TIM5CH3_CAPTURE_STA; //ê?è?2???×′ì?
extern u16 TIM5CH3_CAPTURE_VAL; //ê?è?2????μ
extern u8 TIM5CH4_CAPTURE_STA; //ê?è?2???×′ì?
extern u16 TIM5CH4_CAPTURE_VAL; //ê?è?2????μ
int main(void)
{
u32 temp1=0;
u32 old_num=0;
u32 fq1;
u8 flag=0;
delay_init(); //?óê±oˉêy3?ê??ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //éè??NVIC?D??·?×é2£o2???à??ó??è??£?2???ìó|ó??è??
uart_init(9600); //9600oí115200???éò?
LED_Init(); //LED???ú3?ê??ˉ
TIM5_Cap_Init(0XFFFF,72-1); //ò?1MHzμ??μ?ê??êy
while(1)
{
//ê?è?2???í¨μà1
MaiChong1_Start(); //这个就是我产生500ms高电平、500ms低电平的函数
if(TIM5CH1_CAPTURE_STA&0X80) //3é1|2???μ?á?ò?′?é?éy??
{
if(flag==0) //用flag判断是否已经有过一次高脉冲,如果没有,就把第一次高脉冲时的计数值保存,如果有过高脉冲,就跳过去
{
old_num=TIM5CH1_CAPTURE_VAL; //°?μúò?′?é?éy??×a′?ò???
//TIM5CH1_CAPTURE_VAL=0;
flag=1;
}
if(old_num<TIM5CH1_CAPTURE_VAL)
{
temp1=TIM5CH1_CAPTURE_VAL-old_num;
flag=0;
fq1=1000000/temp1;
printf("A_FREQ:%d Hz\r\n",fq1); //′òó?Aí¨μà?μ?ê
}
if(old_num>TIM5CH1_CAPTURE_VAL)
{
temp1=(0XFFFF-old_num)+TIM5CH1_CAPTURE_VAL;
flag=0;
fq1=1000000/temp1;
printf("A_FREQ:%d Hz\r\n",fq1); //′òó?Aí¨μà?μ?ê
}
TIM5CH1_CAPTURE_STA=0; //?a????ò?′?2???
}
}
}
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最佳答案
查看完整内容[请看2#楼]
求人不如求己,我做出来了,1Hz的频率检测出来是0.999990~0.999992Hz,0.5Hz的频率检测出来是0.499997~0.499998Hz。
觉得这几年论坛不行了,恐怕大家想找个交流的地方也没有,这种技术问题,不要指望QQ群、微信群交流,大段代码只能在论坛。感觉管理员也不太认真了,可能是大家都忙,搞技术的也不太钻研,或者说不肯分享了。
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