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#include <AT89X52.h>
#include <math.h>
#define ADDR1 0x2c //MAX5820LEUA
sbit key_sin=P1^0;
sbit key_tran=P1^2;
sbit key_tooth=P1^4;
sbit SCL = P2 ^ 0;
sbit SDA = P2 ^ 1;
unsigned char code 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(unsigned char,bit);//第一個參數(shù)表示地址，第二個參數(shù)表示讀：1 寫：0
bit write_data(unsigned char);//第一個參數(shù)表示數(shù)據(jù)，第二個參數(shù)表示命令字
void stop();
void Delay(unsigned int);
I2C_Delay(unsigned int I2C_VALUE)
{
while ( --I2C_VALUE!= 0 );
}
/*
函數(shù)：I2C_Init()
功能：I2C 總線初始化，使總線處于空閑狀態(tài)
說明：在 main()函數(shù)的開始處，通常應(yīng)當(dāng)要執(zhí)行一次本函數(shù)
*/
void I2C_Init()
{
SCL = 1;
I2C_Delay(5);
SDA = 1;
I2C_Delay(5);
}
/*
函數(shù)：I2C_Start()
功能：產(chǎn)生I2C 總線的起始狀態(tài)
說明：
SCL處于高電平期間，當(dāng)SDA 出現(xiàn)下降沿時啟動I2C 總線
不論 SDA 和SCL 處于什么電平狀態(tài)，本函數(shù)總能正確產(chǎn)生起始狀態(tài)
本函數(shù)也可以用來產(chǎn)生重復(fù)起始狀態(tài)
本函數(shù)執(zhí)行后，I2C 總線處于忙狀態(tài)
*/
void I2C_Start()
{
SDA = 1;
I2C_Delay(5);
SCL = 1;
I2C_Delay(5);
SDA = 0;
I2C_Delay(5);
SCL = 0;
I2C_Delay(5);
}
/*
函數(shù)：I2C_Write()
功能：向I2C 總線寫1 個字節(jié)的數(shù)據(jù)
參數(shù)：
dat：要寫到總線上的數(shù)據(jù)
*/
void I2C_Write(char dat)
{
unsigned char t = 8;
do
{
SDA = (bit)(dat & 0x80);
dat <<= 1;
SCL = 1;
I2C_Delay(5);
SCL = 0;
I2C_Delay(5);
} while ( --t != 0 );
}
bit I2C_GetAck()
{
bit ack;
SDA = 1;
I2C_Delay(5);
SCL = 1;
I2C_Delay(5);
ack = SDA;
SCL = 0;
I2C_Delay(5);
return ack;
}
void I2C_Stop()
{
unsigned int t = 10;
SDA = 0;
I2C_Delay(5);
SCL = 1;
I2C_Delay(5);
SDA = 1;
I2C_Delay(5);
while ( --t != 0 ); //在下一次產(chǎn)生Start 之前，要加一定的延時
}
void Delay(unsigned int I2C_Delay_t)
{
while ( --I2C_Delay_t!= 0 );
}
bit write_addr(unsigned char addr,bit mod)
{
unsigned char address;
address=addr<<1;
if(mod)
address++;
I2C_Start();
I2C_Write(address);
Delay(10);
if(I2C_GetAck())
return 1;
return 0;
}
bit write_data(unsigned char dat)
{
I2C_Write(dat);
if(I2C_GetAck())
return 1;
return 0;
}
void stop()
{
I2C_Stop();
I2C_Init();
}
void main(void)
{
unsigned char i;
loop:
I2C_Init();
while(1)
{
if(key_sin==0) //產(chǎn)生正弦波
{
while(1)
{
for(i=192;i<255;i++)
{
write_addr(ADDR1,0);
write_data(0);
write_data(sin[i]);
stop();
if(!(key_tran!=0&&key_tooth!=0))
goto loop;
}
for(i=0;i<192;i++)
{
write_addr(ADDR1,0);
write_data(0);
write_data(sin[i]);
stop();
if(!(key_tran!=0&&key_tooth!=0))
goto loop;
}
}
}
if(key_tran==0) //產(chǎn)生三角波
{
while(1)
{
for(i=0;i<255;i++)
{
write_addr(ADDR1,0);
write_data(0);
write_data(i);
stop();
if(!(key_sin!=0&&key_tooth!=0))
goto loop;
}
for(;i>0;i--)
{
write_addr(ADDR1,0);
write_data(0);
write_data(i);
stop();
if(!(key_sin!=0&&key_tooth!=0))
goto loop;
}
}
}
if(key_tooth==0) //產(chǎn)生鋸齒波
{
while(1)
{
for(i=0;i<255;i++)
{
write_addr(ADDR1,0);
write_data(0);
write_data(i);
stop();
if(!(key_tran!=0&&key_sin!=0))
goto loop;
}
}
}
}
}

復(fù)制代碼

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