这个上面不是已经定义了吗,一共使用了两次,为什么都提示没有定义呢
这个是代码
#include "HC_SR04.h"
#include "stm32f10x.h"
#include "SysTick.h"
extern uint32_t mscount = 0;
void HC_SR04Config(void)
{
GPIO_InitTypeDef GPIO_hcsr04init;
TIM_TimeBaseInitTypeDef TIM_hcsr04init;
NVIC_InitTypeDef NVIC_hcsr04init;
NVIC_PriorityGroupConfig( NVIC_PriorityGroup_1);
//gpio配置
GPIO_hcsr04init.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_hcsr04init.GPIO_Pin = GPIO_Pin_11;
GPIO_hcsr04init.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOB, &GPIO_hcsr04init);
GPIO_hcsr04init.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_hcsr04init.GPIO_Pin = GPIO_Pin_10;
GPIO_Init( GPIOB, &GPIO_hcsr04init);
//定时器配置
TIM_hcsr04init.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_hcsr04init.TIM_CounterMode = TIM_CounterMode_Up;
TIM_hcsr04init.TIM_Period = 100-1;
TIM_hcsr04init.TIM_Prescaler = 72-1;
TIM_TimeBaseInit(TIM4, &TIM_hcsr04init);
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM4,DISABLE);
//中断配置
NVIC_hcsr04init.NVIC_IRQChannel = TIM4_IRQn;
NVIC_hcsr04init.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_hcsr04init.NVIC_IRQChannelSubPriority = 0;
NVIC_hcsr04init.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_hcsr04init);
}
void Open_tim4(void)
{
//uint32_t mscount = 0;
TIM_SetCounter(TIM4, 0);
mscount = 0;
TIM_Cmd(TIM4,ENABLE);
}
void Clo_tim4(void)
{
TIM_Cmd(TIM4,DISABLE);
}
void TIM4_IRQHandler(void)
{
//uint32_t mscount = 0;
if(TIM_GetITStatus(TIM4, TIM_IT_Update)!= RESET)//判断是否发生中断
{
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);//清除中断标志位
mscount++;
}
}
//获取定时器计器的值
int Getecho_time(void)
{
uint32_t t = 0;
// t = mscount * 1000;
t = TIM_GetCounter(TIM4);
TIM4->CNT = 0;
usdelay(50000);
return t;
}
//获取超声波测距距离
float Getlength(void)
{
int i = 5;
uint32_t t =0;
float length = 0;
float sum = 0;
while(i != 5)
{
TRIG_send(1);
usdelay(20);
TRIG_send(0);
while(EHCO_rece == 0)
{
Open_tim4();
i=i+1;
}
while(EHCO_rece == 1)
{
Clo_tim4();
t = Getecho_time();
length = (float)t/58;
sum = sum+length;
}
}
length=sum/5.0;
return length;
}