分享一手简易波形发生器的设计
- #include <reg52.h>
- #include <math.h>
- typedef unsigned char u8;
- typedef unsigned int u16;
- #define ADDR1 0x2c //MAX517写入地址
- #define DataPort P0//定义端口
- #define RS_CLR RS=0
- #define RS_SET RS=1
- #define RW_CLR RW=0
- #define RW_SET RW=1
- #define EN_CLR EN=0
- #define EN_SET EN=1
- sbit key_sin=P1^0;
- sbit key_triangle=P1^1;
- sbit key_square=P1^2;
- sbit key_add=P1^3;
- sbit key_minus=P1^4;
- sbit SCL = P2^0;
- sbit SDA = P2^1;
- sbit RS = P2^5;
- sbit RW = P2^6;
- sbit EN = P2^7;
- u16 duty_cycle;//占空比
- u16 compare=128;//方波比较值
- u8 wave_mode=0;//1:正弦波 2:三角波 3:方波
- u8 code Table_sin[256]=//正弦表
- {
- 0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,
- 0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4,0xf5,
- 0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfd,
- 0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,
- 0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,
- 0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x51,
- 0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,
- 0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
- 0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,
- 0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e,
- 0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80
- };
- bit write_addr(u8,bit);//第一个参数表示地址,第二个参数表示 读:1 写:0
- bit write_data(u8);//第一个参数表示数据,第二个参数表示 命令字
- void stop();
- void Delay(u16);
- //系统延时函数
- void Delay(u16 time)
- {
- while ( --time!= 0 );
- }
- //函数:I2C_Delay()
- //功能:I2C 延时函数
- void I2C_Delay(u16 I2C_VALUE)
- {
- while(--I2C_VALUE!=0);
- }
- //函数:I2C_Init()
- //功能:I2C 总线初始化,使总线处于空闲状态
- //说明:在 main()函数的开始处,通常应当要执行一次本函数
- void I2C_Init()
- {
- SCL = 1;
- I2C_Delay(5);
- SDA = 1;
- I2C_Delay(5);
- }
- //函数:I2C_Start()
- //功能:产生I2C 总线的起始状态
- //说明:
- //SCL处于高电平期间,当SDA 出现下降沿时启动I2C 总线
- //不论 SDA 和SCL 处于什么电平状态,本函数总能正确产生起始状态
- //本函数也可以用来产生重复起始状态
- //本函数执行后,I2C 总线处于忙状态
- void I2C_Start()
- {
- SDA = 1;
- I2C_Delay(5);
- SCL = 1;
- I2C_Delay(5);
- SDA = 0;
- I2C_Delay(5);
- SCL = 0;
- I2C_Delay(5);
- }
- //函数:I2C_Write()
- //功能:向I2C 总线写1 个字节的数据
- //参数:char dat 要写到总线上的数据
- void I2C_Write(char dat)
- {
- u8 t = 8;
- do
- {
- SDA = (bit)(dat & 0x80);
- dat <<= 1;
- SCL = 1;
- I2C_Delay(5);
- SCL = 0;
- I2C_Delay(5);
- } while ( --t != 0 );
- }
- //函数:I2C_GetAck()
- //功能:应答
- //参数:无
- bit I2C_GetAck()
- {
- bit ack;
- SDA = 1;
- I2C_Delay(5);
- SCL = 1;
- I2C_Delay(5);
- ack = SDA;
- SCL = 0;
- I2C_Delay(5);
- return ack;
- }
- //函数:I2C_Stop()
- //功能:产生I2C 总线的结束状态
- //参数:无
- void I2C_Stop()
- {
- u16 t = 10;
- SDA = 0;
- I2C_Delay(5);
- SCL = 1;
- I2C_Delay(5);
- SDA = 1;
- I2C_Delay(5);
- while ( --t != 0 ); //在下一次产生Start 之前,要加一定的延时
- }
- //第一个参数表示地址,第二个参数表示 读:1 写:0
- bit write_addr(u8 addr,bit mod)
- {
- u8 address;
- address=addr<<1;
- if(mod)
- address++;
- I2C_Start();
- I2C_Write(address);
- Delay(10);
-
- if(I2C_GetAck())
- return 1;
- return 0;
- }
- //写数据
- bit write_data(u8 dat)
- {
- I2C_Write(dat);
- if(I2C_GetAck())
- return 1;
- return 0;
- }
- void stop()
- {
- I2C_Stop();
- I2C_Init();
- }
- //LCD写命令函数
- void LCD_Write_Com(u8 com)
- {
- RS_CLR;
- RW_CLR;
- EN_SET;
- DataPort=com;
- Delay(500);
- EN_CLR;
- }
- //LCD写数据函数
- void LCD_Write_Data(u8 dat)
- {
- RS_SET;
- RW_CLR;
- EN_SET;
- DataPort=dat;
- Delay(500);
- EN_CLR;
- }
- //LCD清屏函数
- void LCD_Clear(void)
- {
- LCD_Write_Com(0x01);
- Delay(500);
- }
- //LCD写字符函数
- void LCD_Write_Char(u8 x,u8 y,u8 Char)
- {
- if(y==1)
- LCD_Write_Com(0x80+x);//写在第一排
- else
- LCD_Write_Com(0x80+0x40+x);//写在第二排
- LCD_Write_Data(Char);
- }
- //LCD写字符串函数
- void LCD_Write_String(u8 x,u8 y,u8 *s)
- {
- if(y==1)
- LCD_Write_Com(0x80+x);//写在第一排
- else
- LCD_Write_Com(0x80+0x40+x);//写在第二排
- while(*s)
- {
- LCD_Write_Data(*s);
- s++;
- }
- }
- //LCD初始化函数
- void LCD_Init(void)
- {
- LCD_Write_Com(0x38); //显示模式设置,设置 16×2 显示、 5×7 点阵、 8 位数据口
- LCD_Write_Com(0x08); //显示关闭
- LCD_Write_Com(0x01); //显示清屏
- LCD_Write_Com(0x06); //显示光标移动设置:写一个字符后地址指针加一,且光标加一
- LCD_Write_Com(0x0C); //显示开及光标设置:开显示,不显示光标
- }
- void Key_Scan()
- {
- if(key_sin==0)
- {
- Delay(100);//延时消抖
- if(key_sin==0)
- {
- while(!key_sin);//等待按键松开
- LCD_Write_String(0,1," Type:Sin ");
- LCD_Write_String(0,2," Vpp:5V ");
- wave_mode=1;
- }
- }
- if(key_triangle==0)
- {
- Delay(100);//延时消抖
- if(key_triangle==0)
- {
- while(!key_triangle);//等待按键松开
- LCD_Write_String(0,1," Type:Triangle ");
- LCD_Write_String(0,2," Vpp:5V ");
- wave_mode=2;
- }
- }
- if(key_square==0)
- {
- Delay(100);//延时消抖
- if(key_square==0)
- {
- while(!key_square);//等待按键松开
- LCD_Write_String(0,1," Type:Square ");
- LCD_Write_String(0,2," Vpp:5V D:50.0% ");
- wave_mode=3;
- }
- }
- if(wave_mode==3)//如果当前状态是方波
- {
- if(key_add==0)
- {
- Delay(100);//延时消抖
- if(key_add==0)
- {
- while(!key_add);
- compare++;
- if(compare>=231)
- compare=231;
- duty_cycle=(u16)(compare/256.0*1000);
- LCD_Write_Char(10,2,duty_cycle/100+'0');
- LCD_Write_Char(11,2,duty_cycle%100/10+'0');
- LCD_Write_Char(13,2,duty_cycle%10+'0');
- }
- }
- if(key_minus==0)
- {
- Delay(100);//延时消抖
- if(key_minus==0)
- {
- while(!key_minus);
- compare--;
- if(compare<=25)
- compare=25;
- duty_cycle=(u16)(compare/256.0*1000);
- LCD_Write_Char(10,2,duty_cycle/100+'0');
- LCD_Write_Char(11,2,duty_cycle%100/10+'0');
- LCD_Write_Char(13,2,duty_cycle%10+'0');
- }
- }
- }
- }
- void main(void)
- {
- u8 turn=0;
- int i;
- LCD_Init();
- I2C_Init();
- while(1)
- {
- Key_Scan();//按键扫描
- if(wave_mode==1)//正弦波
- {
- i++;
- if(i>=256)
- i=0;
- write_addr(ADDR1,0);
- write_data(0);
- write_data(Table_sin[i]);
- stop();
- }
- if(wave_mode==2)//三角波
- {
- if(turn==0)//三角波反转状态位
- {
- i++;
- if(i>=256)
- turn=1;
- }
- if(turn==1)
- {
- i--;
- if(i<=0)
- turn=0;
- }
- write_addr(ADDR1,0);
- write_data(0);
- write_data(i);
- stop();
- }
- if(wave_mode==3)//方波
- {
- i++;
- if(i>=256)
- i=0;
- if(i<compare)
- {
- write_addr(ADDR1,0);
- write_data(0);//清除原有的数据
- write_data(255);//写高电平1
- stop();
- }
- else
- {
- write_addr(ADDR1,0);
- write_data(0);//清除原有的数据
- write_data(0);//写低电平0
- stop();
- }
- }
- }
- }
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