正在做一个频率和幅度可调的信号发生器，已经编程可实现正弦波，方波，三角波输出，并且用1602显示出当前波形种类。
求问怎样实现频率和幅度可调，并且用lcd1602显示出来，可以只介绍方法，譬如用哪种芯片或者什么手段控制谁，，当然有资料更好。
感激不尽!
下面是我的主函数一小部分，lcd1602的部分是老师的视频资料里介绍的，拿过来套用了，改了自定义字符为“正”“方”“三”，因为不能输出
稍微复杂的字符。第一次发帖求教，希望有人可以指教一二。
电路原理图如下：
dac0832：：
- #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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