- #include<reg51.h>
- #include<intrins.h>
- #include<math.h>
- #define uchar unsigened char
- #define uint unsigned int
- #define AddWr 0x90
- sbit SDA=P3^7;
- sbit SCL=P3^6;
- sbit RS=P2^0;
- sbit RW=P2^1;
- sbit E =P2^2;
- sbit k1=P3^5;
- sbit k2=P1^1;
- sbit k3=P1^2;
- sbit k4=P1^3;
- sbit k5=P1^4;
- unsigned int temp;
- unsigned char way;
- void delay_ms(unsigned int n) //12MHZ晶振时延时1ms,若用11.0592MHZ，则j=110
- {
- unsigned int i=0,j=0;
- for(i=n;i>0;i--)
- for(j=0;j<123;j++);
- }
- void delay_8591()
- {
- _nop_(); _nop_(); _nop_();_nop_(); _nop_(); //起始条件建立时间大于4.7us,延时
- }
- /*******************************************PCF8591DA转换模块**************************/////////////////////
- /****************************************************************************************///////////
- void start()//开始信号
- {
- SDA=1; //确保SDA线为高电平，开始 之前都确保为高电平
- delay_8591();
- SCL=1; //确保SCL为高电平
- delay_8591();
- SDA=0; //在SCL为高时拉低SDA线，即为起始信号
- delay_8591();
- SCL=0; //将SCL线拉低，为后面SDA的传数据时电平变化做准备
- }
- void stop() //停止信号
- {
- SDA=0; //确保SDA线为低电平
- delay_8591();
- SCL=1; //确保SCL线为高电平
- delay_8591();
- SDA=1; //在SCL为高时拉高SDA线，即为停止信号，此时SDA和SCL均为高，同时完成IIC初始化过程
- delay_8591(); ;
- }
- void init() //初始化
- {
- SDA=1;
- delay_8591();
- SCL=1;
- delay_8591();
- }
- void write_byte(unsigned char date) //写一字节数据
- {
- unsigned char i;
- for(i=0;i<8;i++)
- {
- if(date&0x80) //判断最高位，并赋予SDA
- SDA=1;
- else
- SDA=0;
- delay_8591();
- SCL=1; //SCL高电平，SDA数据稳定，发送,通知被控器开始接收数据位
- delay_8591();
- date=date<<1; //发送完成，发生时左移一位 移出的一位在CY中
- SCL=0; //只有在scl=0时sda能变化值
- }
- delay_8591();
- SDA=1; //将SDA拉高，开始为IIC设备应答做准备
- delay_8591();
- }
- void respons()//应答 相当于一个智能的延时函数
- {
- unsigned char i;
- SCL=1; //先拉高SCL，等待SDA应答
- delay_8591();
- while((SDA==1)&&(i<250))
- i++;
- SCL=0;
- delay_8591();
- }
- void write_add(unsigned char date)
- {
- start();
- write_byte(AddWr); //10010000 前四位固定 接下来三位全部被接地了 所以都是0 最后一位是写 所以为低电平
- respons();
- write_byte(0x40);
- respons();
- write_byte(date);
- respons();
- stop();
- }
- unsigned char code sin_tab[256]=
- {
- 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,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,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
- }; //用于生成正弦波
- void sin_8591() //正弦波
- {
- unsigned int i;
- for(i=0;i<256;i++)
- {
- write_add(sin_tab[i]); //data byte
- delay_ms(5);
- }
- }
- void fangbo()
- {
- unsigned int i;
- if(i<128)
- write_add(0xff);
- if(i>=128)
- write_add(0x00);
- i++;
- if(i>256)
- i=0;
- }
-
- void sanjiao()
- {
- unsigned int i;
- while(1)
- {
- for(i=0;i<255;i++)
- write_add(i);
- for(i=255;i>0;i--)
- write_add(i);
- }
- }
-
- void juxing()
- {
- unsigned int i;
- while(1)
- {
- for(i=0;i<256;i++)
- {
- write_add(i);
- }
- }
- }
- void main()
- {
- TH0 = (65536-5000)/256;
- TL0 = (65536-5000)%256;
- TH1 = (65536-5000)/256;
- TL1 = (65536-5000)%256;
- EA = 1;
- ET0 = 1;
- ET1 = 1;
- TR0 = 1;
- TR1 = 1;
- init();
- }
- void anjian(void) interrupt 3
- {
- TH1=(65536-5000)/256; //5000us
- TL1=(65536-5000)%256;
- if(k1==0)
- {
-
- delay_ms(5);
- way++;
- if(way>=3)
- way=0;
- }
- }
- void wave(void) interrupt 1
- {
- TH0=(65536-5000)/256;
- TL0=(65536-5000)%256;
- if(way==0)
- {
- sin_8591();
- }
- if(way==1)
- {
- fangbo();
- }
- if(way==2)
- {
- sanjiao();
- }
- if(way==3)
- {
- juxing();
- }
- }
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