单片机控制的频率和幅度可调的信号发生器的问题 -

#include<delay.h>
#include<dac0832.h>
#include <config.h>
unsigned char const code zxb_code[256]=
{
0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,
0xa5,0xa8,0xab,0xae,0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,
0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,0xe0,
0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,
0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfe,0xfe,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,
0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,
0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,0xe3,0xe1,0xde,0xdc,
0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,
0xbc,0xb9,0xb6,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,
0x99,0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,0x79,0x76,
0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,
0x4f,0x4c,0x49,0x46,0x43,0x40,0x3e,0x3b,0x39,0x36,0x33,0x31,
0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,
0x15,0x14,0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,
0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x1,0x1,0x2,0x3,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,
0xe,0x10,0x12,0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,
0x25,0x27,0x29,0x2c,0x2e,0x30,0x33,0x35,0x38,0x3b,0x3d,0x40,
0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,
0x66,0x69,0x6c,0x6f,0x73,0x76,0x79,0x7c
};
unsigned char keyscan()
{
uint8 keyscan_num,temp;
P1=0xff;
temp=P1;
if(~(temp&0xff)) //键盘扫描
{
if(k0==0)
{
keyscan_num=1;
}
else if(k1==0)
{
keyscan_num=2;
}
else if(k2==0)
{
keyscan_num=3;
}
else
{
keyscan_num=0;
}
return keyscan_num;
}
}
void init_dac()
{
rd=0;
wr=0;
}
void zxb()
{
uint16 i;
do
{
P2=zxb_code[i];
i++;
}while(i<256);
}
void fangbo()
{
do
{
P2=20;
delay_fb();
P2=255;
delay_fb();
}while(k2==1&k0==1);
}
void sanjiao()
{
unsigned int i;
do
{
for(i=0; i<255; i++)
{
P2=i;
delay_out();
}
for(i=255;i>0;i--)
{
P2=i;
delay_out();
}
}while(k1==1&k0==1);
}
main函数：：
/******************************************************************************/
// 包含头文件
/******************************************************************************/
#include "config.h"
#include "lcd1602.h"
#include "dac0832.h"
uint8 flag; //flag为0，1,2时分别表示正弦波，方波 ,三角波
uint8 code lcd1602Table1[8]={0x1f,0x04,0x04,0x17,0x14,0x14,0x1f,0x00};//构造汉字“正”
uint8 code lcd1602Table2[8]={0x04,0x1f,0x04,0x07,0x05,0x09,0x17,0x00};//构造汉字“方”
uint8 code lcd1602Table3[8]={0x1f,0x00,0x00,0x0c,0x00,0x00,0x1f,0x00};//构造汉字“三”
/******************************************************************************/
// main函数
/******************************************************************************/
int main(void)
{
Lcd1602_Init();
Lcd1602_Show_String(2,1,"50hz");
init_dac();
do
{
flag=keyscan();
}while(!flag); //直到没有按键按下就停止扫描
while(1)
{
switch(flag)
{
case 1:do
{
flag=keyscan();
zxb();
Lcd1602_Custom_Char(1,1,0,lcd1602Table1);
}while(flag==1);
break;
case 2: do
{
flag=keyscan();
fangbo();
Lcd1602_Custom_Char(1,1,0,lcd1602Table2);
}while(flag==2);
break;
case 3: do
{
flag=keyscan();
sanjiao();
Lcd1602_Custom_Char(1,1,0,lcd1602Table3);
}while(flag==3);
break;
default:flag=keyscan();
break;
}
}
}

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