STM32F4超声波测距程序 - - Powered by Discuz!

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "timer.h"
#include "lcd.h"
extern u8 TIM5CH1_CAPTURE_STA; //输入捕获状态
extern u32 TIM5CH1_CAPTURE_VAL; //输入捕获值
//超声波函数引脚初始化
void ChaoShengBo_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);//使能GPIOF时钟
//GPIOF9,F10初始化设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//普通输出模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOF, &GPIO_InitStructure);//初始化
GPIO_ResetBits(GPIOF,GPIO_Pin_10);//GPIOF9,F10设置高，灯灭
}
int main(void)
{
u8 key; //保存键值
long long High_TIME=0,distance=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
delay_init(168); //初始化延时函数
uart_init(115200);//初始化串口波特率为115200
ChaoShengBo_Init();
LCD_Init(); //初始化LCD FSMC接口
TIM5_CH1_Cap_Init(0XFFFFFFFF,84-1); //以1Mhz的频率计数
while(1)
{
delay_ms(100);
GPIO_SetBits(GPIOF,GPIO_Pin_10);
delay_ms(1);
GPIO_ResetBits(GPIOF,GPIO_Pin_10); // 给超声波一个高电平
if(TIM5CH1_CAPTURE_STA&0X80) //成功捕获到了一次高电平
{
High_TIME=TIM5CH1_CAPTURE_STA&0X3F;
High_TIME*=0XFFFFFFFF; //溢出时间总和
High_TIME+=TIM5CH1_CAPTURE_VAL; //得到总的高电平时间单位us
distance=High_TIME*340/2/10000; //单位cm
LCD_ShowString(30,40,210,24,24,"High_TIME:");
LCD_ShowString(30,70,210,24,24,"distance:");
LCD_ShowxNum(90,40,High_TIME,15,24,0);
LCD_ShowxNum(150,70,distance,20,24,0);
TIM5CH1_CAPTURE_STA=0; //开启下一次捕获
}
}
}

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