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STM32超聲波測(cè)距protel99se畫的原理圖和PCB圖如下:(51hei附件中可下載工程文件)
單片機(jī)源程序如下:
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
#include "HCSR04.h"
#include "led.h"
#include "beep.h"
#include "key.h"
#include "lcd1602.h"
#include "stmflash.h" //包含頭文件
unsigned long S=0; //定義超聲數(shù)據(jù)
#define FLASH_SAVE_ADDR 0X0800FF00 //設(shè)置FLASH 保存地址(必須為偶數(shù),且其值要大于本代碼所占用FLASH的大小+0X08000000)
extern unsigned long Clock_time;
unsigned char Send_flag=0;
extern u8 TIM3CH1_CAPTURE_STA; //輸入捕獲狀態(tài)
extern u16 TIM3CH1_CAPTURE_VAL; //輸入捕獲值
u16 fls[4];
u8 k=0;
u32 TL=50;
u8 beep1;
u8 t=0;
void key() //按鍵函數(shù)
{
k=KEY_Scan(1); //按鍵掃描的值給K
if(k == KEY0_PRES) //如果K等于 KEY0_PRES,就說明是按下加按鍵
{
TL++; //數(shù)據(jù)加一,如果大于400,則減一,保持最大400
if(TL>400)
TL--;
fls[0]=TL;
STMFLASH_Write(FLASH_SAVE_ADDR,(u16*)fls,1); //存儲(chǔ)
}
if(k == KEY1_PRES)//同上,不過是減
{
TL--;
if(TL<5)
TL++;
fls[0]=TL;
STMFLASH_Write(FLASH_SAVE_ADDR,(u16*)fls,1);
}
}
void ceju()
{
Trig=1;
delay_us(20);
Trig=0; //啟動(dòng)信號(hào)
S=0; //清零距離數(shù)據(jù)
Clock_time=0;
TIM_Cmd(TIM3, DISABLE); //關(guān)定時(shí)器,清零計(jì)時(shí)變量
while(!GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_5)); //等待檢測(cè)到高電平
Clock_time=0;
TIM_Cmd(TIM3, ENABLE); //開定時(shí)器
while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_5)==1&&Clock_time<47058); //只要是高,一直算時(shí)間,如果時(shí)間計(jì)數(shù)超過 47058,所說有問題,直接跳過,47058不一定精確,是一個(gè)大概值,
S=((Clock_time*2)*340/10000)/2; //時(shí)間變量是2us加一,乘以速度,因?yàn)闀r(shí)間是us,換成秒是除以1000000,保留兩位小數(shù),所以除以 10000,然后除以二得到單方面距離
TIM_Cmd(TIM3, DISABLE); //關(guān)定時(shí)器
Clock_time=0; //清零數(shù)據(jù)
printf("Distance:%d cm\r\n",S);//打印總的高點(diǎn)平時(shí)間
}
void show()
{
LCD1602_Show_Str(0,0,"Distance:"); //顯示
if(S>=100&&S<=400) LCD1602_Write_Dat(S/100%10+0x30); //這里是測(cè)速數(shù)據(jù)
else LCD1602_Show_Str(9,0," ");
if(S>=10) LCD1602_Write_Dat(S/10%10+0x30);
else LCD1602_Show_Str(10,0," ");
LCD1602_Write_Dat(S%10+0x30);
LCD1602_Show_Str(12,0,"cm ");
LCD1602_Show_Str(0,1,"alarm :"); //這里開始顯示報(bào)警數(shù)據(jù),下面這三段,其實(shí)就是判斷閾值數(shù)據(jù)是百位數(shù)還是十位數(shù)還是個(gè)位數(shù),如果是個(gè)位數(shù),顯示個(gè)位數(shù)據(jù),百位十位顯示空
if(TL>=100&&TL<=400)
{
LCD1602_Write_Dat(TL/100%10+0x30);
LCD1602_Write_Dat(TL/10%10+0x30);
LCD1602_Write_Dat(TL%10+0x30);
LCD1602_Show_Str(12,1,"cm ");
}
if(TL>=10&&TL<100)
{
LCD1602_Show_Str(9,1," ");
LCD1602_Write_Dat(TL/10%10+0x30);
LCD1602_Write_Dat(TL%10+0x30);
LCD1602_Show_Str(12,1,"cm ");
}
if(TL>0&&TL<10)
{
LCD1602_Show_Str(9,1," ");
LCD1602_Show_Str(10,1," ");
LCD1602_Write_Dat(TL%10+0x30);
LCD1602_Show_Str(12,1,"cm ");
}
}
void problem() //報(bào)警函數(shù)
{
if(S<TL) //小于閾值,蜂鳴器開始響,對(duì)應(yīng)指示燈亮,否則蜂鳴器不響
{
beep1=1;
LED1=1;
}
else
{
beep1=0;
LED1=0;
LED0=1;
}
}
int main(void)
{
u16 datatemp[1];
BEEP_Init();
KEY_Init();
delay_init(); //延時(shí)函數(shù)初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置NVIC中斷分組2:2位搶占優(yōu)先級(jí),2位響應(yīng)優(yōu)先級(jí)
uart_init(115200); //串口初始化為115200
LED_Init(); //LED端口初始化
UltrasonicWave_Configuration(); //初始化超聲IO
TIM3_Cap_Init(1,72-1); //以1Mhz的頻率計(jì)數(shù),第一個(gè)選項(xiàng),最小只能是1
LCD1602_Init();
STMFLASH_Read(FLASH_SAVE_ADDR,(u16*)datatemp,1);
TL=datatemp[0];
if(TL<5||TL>400)
TL=50;
ceju();
printf("Distance"); //串口打印一下,調(diào)試用
while(1)
{
if(beep1==1) //如果蜂鳴器標(biāo)志等于1,則開始滴滴叫,指示燈也是閃爍
{
BEEP=!BEEP;
LED0=!LED0;
}
else
BEEP=0;
show(); //調(diào)用顯示函數(shù)
key(); //調(diào)用按鍵函數(shù)
problem();//調(diào)用報(bào)警處理函數(shù)
t++; //變量自加,加到5的時(shí)候,對(duì)5取余會(huì)等于0,則啟動(dòng)一次測(cè)距函數(shù)
if(t%5==0)
{
t=0;
ceju();
}
}
}
下載:
STM32 超聲波測(cè)距程序和protel99格式的PCB原理圖.7z
(343.72 KB, 下載次數(shù): 41)
2022-11-20 19:47 上傳
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