51单片机控制12864绘制串口发送的距离变化曲线
数据采集端使用STM32为主控，超声波模块测距，测距信息经过压缩，串口发送给51单片机，51单片机控制12864显示距离变化曲线。
程序
#include<reg52.h>
#include<math.h>
#include"ZB.h"
#define uchar unsigned char
#define uint unsigned int
#define LCD_databus P0 //LCD数据总线连接P0口
sbit RS=P2^6;
sbit RW=P2^5;
sbit EN=P2^7;//LCD12864三个控制位
sbit DQ=P2^3;//DS18B20数据线
sbit KEY1=P3^2;
sbit KEY2=P3^3;
sbit KEY3=P3^4;
uchar key_value;
uchar DisTance; //距离作为横轴13-127 X 13-127
uchar RSSI; //信号强度作为纵轴20-63 Y 0-39
unsigned Interrupt_Flag=1;
unsigned int receiveData;
uchar HZ1[]="周期";
uchar HZ2[]="幅度";
//uchar DELE_DATA[115];
void delay(uint i) //延时函数
{
while(--i);
}
void Read_busy() //LCD12864忙检测
{
RS=0;
RW=1;
EN=1;
LCD_databus=0xFF;
while(LCD_databus & 0x80); //判断最高位，1---busy，0---Nobusy
EN=0;
}
void write_LCD_command(uchar value)//写指令
{
RS=0;
RW=0;
EN=1;
LCD_databus=value;
delay(7);
EN=0;
}
void write_LCD_data(uchar value)//写数据
{
RS=1;
RW=0;
EN=1;
LCD_databus=value;
delay(7);
EN=0;
}
void init_LCD() //初始化LCD
{
write_LCD_command(0x30); //8位数，基本指令
delay(100);
write_LCD_command(0x30);
delay(37);
write_LCD_command(0x0C); //开显示，不显示光标，光标不闪烁
delay(100);
write_LCD_command(0x01); //清屏指令
delay(100);
write_LCD_command(0x06); //没写入数据，地址指针加1
}
void Clear_GDRAM() //清楚GDRAM
{
uchar x,y;
for(y=0;y<64;y++)
{
for(x=0;x<16;x++)
{
write_LCD_command(0x34);
write_LCD_command(y+0x80); //先送垂直地址
write_LCD_command(x+0x80); //后送水平地址
write_LCD_command(0x30); //基本指令
write_LCD_data(0x00); //写入数据0
write_LCD_data(0x00);
}
}
}
uchar ReadByte() //读LCD
{
uchar Read_value;
Read_busy();
RS=1;
RW=1;
EN=0;
EN=1;
Read_value=LCD_databus;
EN=0;
return Read_value;
}
void display_BMP(uchar *address)//显示图片
{
uchar i,j;
for(i=16;i<32;i++)
{
write_LCD_command(0x80+i); //先送垂直地址
write_LCD_command(0x80); //再送水平地址
for(j=0;j<16;j++)
{
write_LCD_data(*address);//写入数据
address++;
}
}
for(i=0;i<32;i++)
{
write_LCD_command(0x80+i);//先送垂直地址
write_LCD_command(0x88); //再送水平地址
for(j=0;j<16;j++)
{
write_LCD_data(*address);
address++;
}
}
}
void Draw_dots(uchar x,uchar y,uchar color)
{
uchar ROW,xlabel,xlabel_bit;
uchar Read_H,Read_L; //读LCD中的数据
write_LCD_command(0x34); //扩充指令
write_LCD_command(0x36); //打开绘图指令
xlabel=x>>4; //取16*16首地址
xlabel_bit=x & 0x0F; //计算该点在16位数据的第几位
if(y<32) //如果是上半屏,上下半屏y都是0--31
{
ROW=y;
}
else //显示的是下半屏
{
ROW=y-32;
xlabel+=8; //规定显示在下半屏
}
write_LCD_command(ROW+0x80); //送入垂直地址
write_LCD_command(xlabel+0x80);//再送入水平地址
ReadByte(); //读取当前GDRAM数据前腰进行一次空读，接下来就可以读出数据了
Read_H=ReadByte(); //读高8位
Read_L=ReadByte(); //读低8位
write_LCD_command(ROW+0x80); //送入垂直地址
write_LCD_command(xlabel+0x80); //再送入水平地址
if(xlabel_bit<8)
{
switch(color)
{
case 0:Read_H &= (~(0x01<<(7-xlabel_bit)));//若变白
break;
case 1:Read_H |= (0x01<<(7-xlabel_bit));//若涂黑
break;
case 2:Read_H ^= (0x01<<(7-xlabel_bit));//若反转
break;
default:break;
}
write_LCD_data(Read_H);//将数据写入GDRAM
write_LCD_data(Read_L);//先写高位，再写低位(地址指针顺序)
}
else
{
switch(color)//color设置
{
case 0: Read_L &= (~(0x01<<(15-xlabel_bit)));//若变白
break;
case 1: Read_L |= (0x01<<(15-xlabel_bit));//若涂黑
break;
case 2: Read_L ^= (0x01<<(15-xlabel_bit));//若反转
break;
default:break;
}
write_LCD_data(Read_H);
write_LCD_data(Read_L);//写入数据
}
write_LCD_command(0x30);//回到普通模式
}
void Usart() interrupt 4
{
Interrupt_Flag=0;
RSSI=SBUF;
RI = 0;
SBUF=RSSI;
while(!TI);
TI=0;
}
void uart(void)
{
SCON=0x40;
REN=1;
TMOD=0x20;
TH1=0xfd,TL1=0xfd;
TR1=1;
ES=1; //打开接收中断
EA=1; //打开总中断
}
void main()
{
uchar i;
uchar w=10,A=10; //A是正弦波的振幅
uart();
init_LCD();
Clear_GDRAM();
write_LCD_command(0x36);
//display_BMP(ZB); //坐标
while(1)
{
for(i=13;i<128;i++) //画图 Y轴方向0-39 X = 13-127
{
while(Interrupt_Flag==1); //等待串口中断，接收数据后标志位清零，进行画点
Draw_dots(i,RSSI,1); //将得到的数据进行显示
Interrupt_Flag=1; //从置标志位，继续等待
}
Clear_GDRAM(); //清屏函数
write_LCD_command(0x36);
// display_BMP(ZB); //坐标
}
}