[mw_shl_code=c,true]#include "UltrasonicWave.h"
#include "usart.h"
#include "timer.h"
#include "delay.h"
#define TRIG_PORT GPIOC //TRIG
#define ECHO_PORT GPIOC //ECHO
#define TRIG_PIN GPIO_Pin_13 //TRIG
#define ECHO_PIN GPIO_Pin_14 //ECHO
float UltrasonicWave_Distance; //计算出的距离
/*
* ????????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); //关闭jtag
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = TRIG_PIN; //PC8接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
GPIO_InitStructure.GPIO_Pin = ECHO_PIN; //PC7接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接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_7; //PC8接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 中断线以及中断初始化配置
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource14);
EXTI_InitStructure.EXTI_Line=EXTI_Line14;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;//ji'cu?????÷
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //使能键所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //??????????2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //×???????2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //?????????????¨??
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化NVIC寄存器
}
void EXTI9_5_IRQHandler(void)
{
delay_us(10); //???±10us
if(EXTI_GetITStatus(EXTI_Line14) != RESET)
{
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
if(UltrasonicWave_Distance>40)
{
GPIO_SetBits(GPIOA,GPIO_Pin_2);
GPIO_SetBits(GPIOB,GPIO_Pin_7);
}
else if(UltrasonicWave_Distance<40)
{
GPIO_SetBits(GPIOA,GPIO_Pin_2);
GPIO_ResetBits(GPIOB,GPIO_Pin_7);
}
EXTI_ClearITPendingBit(EXTI_Line14); //????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);
}
/******************* (C) 1209 Lab *****END OF FILE************/
[/mw_shl_code]
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