基于51单片机和DAC0832转换的数控音频功率放大器设计 -

#include<reg51.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit E=P1^2; sbit RS=P1^0; sbit RW=P1^1; sbit key1=P1^3; sbit key2=P1^4; sbit key3=P1^5; sbit key4=P1^6; sbit key5=P1^7;
void lcd_init();
void write_comm(uchar);
void write_data(uchar);
void write_string(uchar,uchar,uchar *);
void lcd_delay();
void delay_ms(uint);
void delay_ms(uint i) // 延时 i 毫秒
{
uint j;
while(i--)
{
for(j=0;j<=74;j++)
{
_nop_();
}
}
}
void lcd_init()
{
lcd_delay();
write_comm(0x38); // 显示模式控制：设置 16*2 显示， 5*7 点阵， 8
位数据口
write_comm(0x08); // 关显示
write_comm(0x01); // 清屏
write_comm(0x06); // 输入模式控制：光标右移，整屏不移动
write_comm(0x0c); // 开显示，显示光标，光标闪烁
//0x0e ，开显示，显示下光标，光标不闪烁
write_comm(0x80);
write_comm(0x02); // 数据指针清零
}
void write_comm(uchar i)
{
RS=0; RW=0; P0=i;
lcd_delay(); E=0; lcd_delay(); E=1;
}
void write_data(uchar i)
{
RS=1; RW=0; P0=i;
lcd_delay(); E=0; lcd_delay(); E=1;
}
void write_string(uchar row,uchar column,uchar *dis_buffer)
{
switch(row) // 这种结构保持以后升级到多行显示液晶
{
地址指针
}
case 1:write_comm(0x80+column);break;
case 2:write_comm(0x80+0x40+column);break;// 重新调整数据
default:break;
while(*dis_buffer!='\0') // '\0' 结束符
{
write_data(*dis_buffer);
dis_buffer++;
column++;
if(column==16)
{
column=0; row++; if(row>=3)
return; else switch(row)
// 这种结构保持以后升级到多行显示液晶
{
case 1:write_comm(0x80);break;
case 2:write_comm(0x80+0x40);break;
// 重新调整数据地址指针
default:break;
}
}
}
}
void lcd_delay()
{
uchar i;
for(i=0;i<255;i++);
}
void main()
{
lcd_init();
//cntl1=1;cntl3=1; cntl2=0;cntl4=0;cntl5=1;cntl6=0;
write_string(1,0,"Gain:");
while(1)
{
if(key1==0)
{
delay_ms(15);
if(key1==0)
{
while(!key1); P2=0x02;
write_string(2,0,"0dB");
}
}
if(key2==0)
{
delay_ms(15);
if(key2==0)
{
while(!key2); P2=0x08;
write_string(2,0,"10dB");
}
}
if(key3==0)
{
delay_ms(15);
if(key3==0)
{
while(!key3); P2=0x1A;
write_string(2,0,"20dB");
}
}
if(key4==0)
{
delay_ms(15);
if(key4==0)
{
while(!key4); P2=0x51;
write_string(2,0,"30dB");
}
}
if(key5==0)
{
delay_ms(15);
if(key5==0)
{
while(!key5); P2=0xff;
write_string(2,0,"40dB");
}
}
}
}

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