📄 51.c
字号:
#include"intrins.h"
#include"AT89X51.H"
#define uchar unsigned char
#define uint unsigned int
#define LCD_RS P2_7
#define LCD_RW P2_6
#define LCD_EN P2_5
#define LCD_DATA P0
#define bflag P0_7
/*函数原型*/
void init(void); /*初始化硬件*/
void LCD_init(void); /*初始化LCD*/
void LCD_cmd(uchar cmd); /*写入控制命令*/
void delay(uint dly);
void setxy(char x,char y);
void LCD_string(char *s);
void LCD_char(char chr);/*写入要显示的字符*/
void wait_until_ready(void); /*检测忙标志，忙则等待*/
uchar freqH;
uchar freqL;
/*4行4列的按键编码*/
uchar list[4][4]={
0x00,0x01,0x02,0x03,
0x04,0x05,0x06,0x07,
0x08,0x09,0x0a,0x0b,
0x0c,0x0d,0x0e,0x0f
};
/* 0 1 2 3
4 5 6 7
8 9 A B
C D E F
*/
//A确认键
//B启动频率输出键
//C停止频率输出健
//D频率步进增加键
//E频率步进减少键
/*初始化硬件*/
void init(void)
{
IE=0x88; //10001000b允许TIMER1中断
IP=0x08; //00001000b定义定时器为高优先级中断
TMOD=0x10; //定时器1采用方式1
TH1=0xfe; //初始化输出频率1kHz
TL1=0x0c;
freqH=0xfe;
freqL=0x16;
}
void LCD_init(void)
{
LCD_cmd(0x38);/*8位数据，2行显示*/
LCD_cmd(0x08);/*显示关闭*/
LCD_cmd(0x06);/*写入数据后光标右移*/
LCD_cmd(0x0f);/*显示开，显示光标,光标闪烁*/
LCD_cmd(0x01);/*清屏*/
setxy(1,1);
LCD_string("Press b to start");
}
void LCD_cmd(uchar cmd)
{
LCD_RS=0;
LCD_RW=0;
LCD_DATA=cmd;
LCD_EN=1;
delay(20);
LCD_EN=0;
wait_until_ready();
}
void LCD_char(char chr)/*写入要显示的字符*/
{ LCD_RS=1;
LCD_RW=0;
LCD_DATA=chr;
LCD_EN=1;
delay(20);
LCD_EN=0;
wait_until_ready();
}
void wait_until_ready(void) /*检测忙标志，忙则等待*/
{
LCD_RS=0;
LCD_RW=1;
LCD_DATA=0x0ff;
LCD_EN=1;
delay(20);
do{ACC=LCD_DATA;}
while(bflag==1);
LCD_EN=0;
}
/*设定显示位置，行x=1或2,列y=1~16的任意整数*/
void setxy(char x,char y)
{
char temp;
if(x==1)
{
temp=0x80+y-1;
LCD_cmd(temp);
}
else
{
temp=0xC0+y-1;
LCD_cmd(temp);
}
}
void LCD_string(char *s)
{
for(;*s!='\0';s++)
LCD_char(*s);
}
/*延时*/
void delay(uint dly)
{ uint j;
for(j=0;j<dly;j++);
}
void main(void)
{uint i1;
uint i2;
uint i=0;
uint j;
uint start=0;
uchar Key;
uchar Keycode[2]={0,1};
uchar Keydata;
uchar temp1;
uint Tinit;
float freq=1;
init();
LCD_init();
while(1)
{
P3_3=0;
P3_2=0;
P3_1=0;
P3_0=0;
if(P3_4==0||P3_5==0||P3_6==0||P3_7==0) //初次判断有键
delay(1000);
else
continue;
P3_3=0;
P3_2=0;
P3_1=0;
P3_0=0;
if(P3_4==0||P3_5==0||P3_6==0||P3_7==0) //第二次判断有键
{
delay(1000);
if(P3_4==0)
i1=0;
else if(P3_5==0)
i1=1;
else if(P3_6==0)
i1=2;
else if(P3_7==0)
i1=3;
}
else
continue;
P3_3=0;
P3_2=0;
P3_1=0;
P3_0=0;
if(P3==0xe0||P3==0xd0||P3==0xb0||P3==0x70)
{
delay(1000);
if(P3_4==0)
i2=0;
else if(P3_5==0)
i2=1;
else if(P3_6==0)
i2=2;
else if(P3_7==0)
i2=3;
}
else
continue;
if(i1==i2)//判断出有按键，查具体位置
{
P3_3=0; //检查第一行
P3_2=1;
P3_1=1;
P3_0=1;
if((P3&0xf0)!=0xf0)
j=0;
P3_3=1; //检查第二行
P3_2=0;
P3_1=1;
P3_0=1;
if((P3&0xf0)!=0xf0)
j=1;
P3_3=1; //检查第三行
P3_2=1;
P3_1=0;
P3_0=1;
if((P3&0xf0)!=0xf0)
j=2;
P3_3=1; //检查第四行
P3_2=1;
P3_1=1;
P3_0=0;
if((P3&0xf0)!=0xf0)
j=3;
do{
delay(5000);
P3_3=0;
P3_2=0;
P3_1=0;
P3_0=0;}
while(P3!=0xf0); //等到按键放开
}
else
continue;
Key=list[j][i1];
if(Key==0x0b) //启动频率输出
{
start=1;
freqH=0xfe;
freqL=0x16;
// freqH=0xff;
// freqL=0xdf;
freq=1;
i=0;
TR1=1; //启动timer1
LCD_cmd(0x01);/*清屏*/
setxy(1,1);
LCD_string("Start at:");
setxy(2,1);
LCD_string("01kHz");
}
if(Key==0x0c) //停止频率输出
{
start=0;
i=0;
TR1=0; //停止timer1
setxy(1,1);
LCD_cmd(0x01);/*清屏*/
LCD_string("Stop");
setxy(2,1);
LCD_string("Press b to start");
}
if(start==1)
{
if(0x00<=Key&&Key<=0x09) //存储用户选择频率值
{
Keycode[i]=Key;
i++;
if(i==1)
{
setxy(2,0);
LCD_string(" "); //清第二行
}
setxy(2,i);
Keydata=Key+48;
LCD_char(Keydata);
if(i==2)
i=0;
}
if(Key==0x0a) //A为确认键
{
if(i==1)
continue;
i=0;
freq=Keycode[0]*10+Keycode[1];
if(freq<=20)
{
TR1=0; //停止timer1
Tinit=0x10009-(uint)(500/freq); //12M晶振 10009的值可微调
// Tinit=0x10009-(uint)(1000/freq); //24M晶振替换上一句
freqH=(uchar)((Tinit&0xff00)>>8);
freqL=(uchar)(Tinit&0x00ff); //改变频率
TR1=1; //启动timer1
LCD_string("kHz");
}
else
{
setxy(2,1);
LCD_string("Out of range!");
}
}
if(Key==0x0d) //频率步进增加,步进0.5kHz
{
freq=freq+0.5;
if(freq>20)
freq=20; //超出20kHz不再增加
TR1=0; //停止timer1
Tinit=0x10009-(uint)(500/freq); //12M晶振 10009的值可微调
// Tinit=0x10009-(uint)(1000/freq); //24M晶振替换上一句
freqH=(uchar)((Tinit&0xff00)>>8);
freqL=(uchar)(Tinit&0x00ff); //改变频率
TR1=1; //启动timer1
setxy(2,1);
Keydata=(uchar)(freq/10); //取十位
temp1=Keydata;
LCD_char(Keydata+48);
Keydata=(uchar)(freq-Keydata*10); //取个位
LCD_char(Keydata+48);
if((freq-temp1*10-Keydata)!=0)
LCD_string(".5kHz");
else
LCD_string(".0kHz");
}
if(Key==0x0e) //频率步进减小,步进0.5kHz
{
freq=freq-0.5;
if(freq<1)
freq=1; //小于1kHz不再减小
TR1=0; //停止timer1
Tinit=0x10009-(uint)(500/freq); //12M晶振 10009的值可微调
// Tinit=0x10009-(uint)(1000/freq); //24M晶振 替换上一句
freqH=(uchar)((Tinit&0xff00)>>8);
freqL=(uchar)(Tinit&0x00ff); //改变频率
TR1=1; //启动timer1
setxy(2,1);
Keydata=(uchar)(freq/10); //取十位
temp1=Keydata;
LCD_char(Keydata+48);
Keydata=(uchar)(freq-Keydata*10); //取个位
LCD_char(Keydata+48);
if((freq-temp1*10-Keydata)!=0)
LCD_string(".5kHz");
else
LCD_string(".0kHz");
}
}
}
}
void timer1(void) interrupt 3
{
TH1=freqH;
TL1=freqL;
P2_0=~P2_0; //输出方波
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -