基于stm32的超声波测距程序，一直无法找到问题出在哪里

76个汉字

[mw_shl_code=c,true]#include "UltrasonicWave.h" #include "usart.h" #include "timer.h" #include "delay.h" #define TRIG_PORT GPIOA //TRIG #define ECHO_PORT GPIOA //ECHO #define TRIG_PIN GPIO_Pin_1 //TRIG #define ECHO_PIN GPIO_Pin_0 //ECHO float UltrasonicWave_Distance; //?????????à?? /* * ????????UltrasonicWave_Configuration * ?è?? ?????ù?¨???é???????? * ???? ???? * ???? ???? */ void UltrasonicWave_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable , ENABLE); //??±?jtag RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = TRIG_PIN; //PC8??TRIG GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //?è?????ì???????? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(TRIG_PORT, &GPIO_InitStructure); //?????????èGPIO RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = ECHO_PIN; //PC7??ECH0 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //?è?????? GPIO_Init(ECHO_PORT,&GPIO_InitStructure); //??????GPIOA RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PC8??TRIG GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //?è?????ì???????? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); //?????????èGPI // // RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE); // // GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PC8??TRIG // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //?è?????ì???????? // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // GPIO_Init(GPIOB, &GPIO_InitStructure); //?????????èGPI // //GPIOC.7 ?????????°?????????????? GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0); EXTI_InitStructure.EXTI_Line=EXTI_Line0; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); //?ù??EXTI_InitStruct?????¨???????????????èEXTI?????÷ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //????°??ü?ù?????????????¨?? NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //??????????2 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //×???????2 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //?????????????¨?? NVIC_Init(&NVIC_InitStructure); //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷ } void EXTI0_IRQHandler(void) { delay_us(10); //???±10us if(EXTI_GetITStatus(EXTI_Line0) != RESET) //1 { TIM_SetCounter(TIM2,0); TIM_Cmd(TIM2, ENABLE); //?????±?? while(GPIO_ReadInputDataBit(ECHO_PORT,ECHO_PIN)); //?????????? TIM_Cmd(TIM2, DISABLE); //?¨?±?÷2?§?? UltrasonicWave_Distance=TIM_GetCounter(TIM2)*5*34/200.0; //?????à??&&UltrasonicWave_Distance<150 // OLED_ShowNum(103,6,UltrasonicWave_Distance,3,16); if(UltrasonicWave_Distance<15) { GPIO_SetBits(GPIOA,GPIO_Pin_2); } else if(UltrasonicWave_Distance>15) { GPIO_ResetBits(GPIOA,GPIO_Pin_2); } EXTI_ClearITPendingBit(EXTI_Line0); //????EXTI7???·?????? } } /* * ????????UltrasonicWave_StartMeasure * ?è?? ?????????à??·???????>10us???????????ó????·????????????±?? * ???? ???? * ???? ???? */ void UltrasonicWave_StartMeasure(void) { GPIO_SetBits(TRIG_PORT,TRIG_PIN); //??>10US?????????TRIG_PORT,TRIG_PIN????????define????? delay_us(20); //???±20US GPIO_ResetBits(TRIG_PORT,TRIG_PIN); }[/mw_shl_code]

PA2连接的是一个led来检测超声波的测距功能，可是无论怎么检测都是在40cm范围内灯才亮的，就算改变算法 [mw_shl_code=c,true]UltrasonicWave_Distance=TIM_GetCounter(TIM2)*340/200.0还是不行，有没有人帮我看看是哪里出错了[/mw_shl_code]

正点原子

帮顶。。。。