【杰发科技AC7802x测评】点灯测试|串口测试|超声波

#include "string.h"



#include "ac780x_timer.h"



#include "ac780x_timer_reg.h"



#include "ac780x_gpio.h"



#include "HCSR04.h"



uint64_t time = 0;//声明变量，用来计时



uint64_t time_end = 0;//声明变量，存储回波信号时间



void Timer0_Init ( void )



{



TIMER_ConfigType timerConfig0;



memset ( &timerConfig0, 0, sizeof ( timerConfig0 ) );



/* TIMER0配置函数 */



timerConfig0.periodValue = Delay10ms; /*! 10ms计时 */



timerConfig0.interruptEn = DISABLE; /*! 禁能定时器中断 */



timerConfig0.linkModeEn = DISABLE; /*! 禁能链接模式 */



timerConfig0.timerEn = DISABLE; /*! 先关掉定时器,以使得计时时间更精确，具体位置在GPIO中断处理函数中 */



timerConfig0.callBack = NULL; /*! 回调函数为空 */



TIMER_Init ( TIMER_CHANNEL0, &timerConfig0 ); /*! TIMER初始化函数生效 */



mdelay ( 10 ); /*! 防止在定时器溢出后产生误差 */



}



uint32_t sonar_mm ()//测距并返回单位为毫米的距离结果



{



uint32_t Distance, Distance_mm = 0;//返回测距结果



TRIG_ON;//输出高电平



mdelay ( 15 );//延时15微秒



TRIG_OFF;//输出低电平



TIMER_SetChannel ( TIMER_CHANNEL0, ENABLE );



while ( GET_ECHO_STS == FALSE );//等待低电平结束



time = TIMER_GetCurrentValue ( TIMER_CHANNEL0 );//计时清零



while ( GET_ECHO_STS == TRUE );//等待高电平结束



TIMER_SetChannel ( TIMER_CHANNEL0, DISABLE ); /*!此处关闭定时器 */



time_end = TIMER_GetCurrentValue ( TIMER_CHANNEL0 );



time_end = time_end - time; //记录结束时的时间



if ( time_end / 100 < 38 )//判断是否小于38毫秒，大于38毫秒的就是超时，直接调到下面返回0



{



Distance = ( time_end * 346 ) / 2;//计算距离，25°C空气中的音速为346m/s



Distance_mm = Distance / 100;//因为上面的time_end的单位是10微秒，所以要得出单位为毫米的距离结果，还得除以100



}



return Distance_mm;



}



void gpio_init ( void )



{



GPIO_SetFunc ( TRIG_PORT, TRIG_PIN, GPIO_FUN0 );



GPIO_SetFunc ( ECHO_PORT, ECHO_PIN, GPIO_FUN0 );



GPIO_SetDir ( TRIG_PORT, TRIG_PIN, GPIO_OUT );



GPIO_SetDir ( ECHO_PORT, ECHO_PIN, GPIO_IN );



GPIO_SetPulldown ( ECHO_PORT, ECHO_PIN, ENABLE );



}



uint32_t HC_SR04_READ ( void )



{



gpio_init();



Timer0_Init();



return sonar_mm ();



}

#ifndef HCSR04_H_



#define HCSR04_H_



#ifdef __cplusplus



extern "C" {



#endif /*__cplusplus */



/* =========================================== Includes =========================================== */



#include "stdio.h"



#include "stdint.h"



/* ============================================ Define ============================================ */



#define Timer_CLK (APB_BUS_FREQ) /*! 定义定时器时钟为APB */



#define DelayS(n) (Timer_CLK*n-1) /*! n 秒超时值 */



#define Delay1ms (Timer_CLK/1000-1) /*! 1ms超时值 */



#define Delay10ms (Timer_CLK/100-1) /*! 10ms超时值 */



/* =========================================== Typedef ============================================ */



/* ========================================== Variables =========================================== */



/* ==================================== Functions declaration ===================================== */



void Timer0_Init ( void );



uint32_t sonar_mm (void);



void gpio_init ( void );



uint32_t HC_SR04_READ ( void );



/* ====================================== Functions define ======================================== */



#define TRIG_PORT (GPIOA)



#define TRIG_PIN (GPIO_PIN2)



#define ECHO_PORT (GPIOA)



#define ECHO_PIN (GPIO_PIN3)



#define TRIG_ON do{GPIO_SetPinLevel(TRIG_PORT, TRIG_PIN, GPIO_LEVEL_HIGH);}while(0)



#define TRIG_OFF do{GPIO_SetPinLevel(TRIG_PORT, TRIG_PIN, GPIO_LEVEL_LOW);}while(0)



#define GET_ECHO_STS (GPIO_GetPinLevel(ECHO_PORT, ECHO_PIN))



#ifdef __cplusplus



}



#endif /*__cplusplus */



#endif /* HCSR04_H_ */