超聲波測距

ID:252361 · 發表于 2017-11-22 17:47

直接上干貨
#include"lcd.h"

void Read_Busy()          //忙檢測函數，判斷bit7是0，允許執行；1禁止
{
unsigned char sta;    //
LCD1602_DB = 0xff;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
      LCD1602_EN = 1;
      sta = LCD1602_DB;
      LCD1602_EN = 0; //使能，用完就拉低，釋放總線
}while(sta & 0x80);
}

void Lcd1602_Write_Cmd(unsigned char cmd)    //寫命令
{
Read_Busy();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_EN = 1;
LCD1602_EN = 0;
}

void Lcd1602_Write_Data(unsigned char dat) //寫數據
{
   Read_Busy();
   LCD1602_RS = 1;
   LCD1602_RW = 0;
   LCD1602_DB = dat;
   LCD1602_EN = 1;
   LCD1602_EN = 0;
}

void LcdSetCursor(unsigned char x,unsigned char y)  //坐標顯示
{
unsigned char addr;
if(y == 0)
      addr = 0x00 + x;
else
      addr = 0x40 + x;

Lcd1602_Write_Cmd(addr|0x80);
}

//按指定位置顯示一個字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y) X |= 0x40; //當要顯示第二行時地址碼+0x40;
X |= 0x80; //算出指令碼
Lcd1602_Write_Cmd(X); //發命令字
Lcd1602_Write_Data(DData); //發數據
}

void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str)    //顯示字符串
{
LcdSetCursor(x,y);    //當前字符的坐標
while(*str != '\0')
{
      Lcd1602_Write_Data(*str++);
}
}

void InitLcd1602()             //1602初始化
{
Lcd1602_Write_Cmd(0x38); //打開，5*8,8位數據
Lcd1602_Write_Cmd(0x0c);
Lcd1602_Write_Cmd(0x06);
Lcd1602_Write_Cmd(0x01); //清屏
}

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超聲波測距