TLC5615 signal generator program - sine wave, sawtooth wave, square wave, triangle wave

  Program function: output sine wave, sawtooth wave, square wave, triangle wave
  Involved chip: TLC5615
*************************************************** **********/
#include
#define uint unsigned int
#define uchar unsigned char
sbit din=P3^0;
sbit scl=P3^1;
sbit cs1=P3^2;
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^3;
//sbit w2= P1^0;
uchar code sine_tab[256]={
 //Output voltage from 0 to maximum value (1/4 part of sine wave)
 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,
 //Output voltage from maximum value to 0 (1/4 part of sine wave)
 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,
 //Output voltage from 0 to minimum value (1/4 part of sine wave)
 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,
 //Output voltage from minimum to 0 (1/4 part of sine wave)
 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};
 
uchar bdata date; //bit addressing
sbit date7=date^7;
sbit date6=date^6;
sbit date5=date^5;
sbit date4=date^4;
sbit date3=date^3;
sbit date2=date^2;
sbit date1=date^1;
sbit date0=date^0;

void delay(uint t)
 {
  while(t--);
 }
void write_sip5615(uchar k)
 {
  date=k;
 din=date7;
 scl=0;
 scl=1;

 din=date6;
 scl=0;
 scl=1;

 din=date5;
 scl=0;
 scl=1;

 din=date4;
 scl=0;
 scl=1;

 din=date3;
 scl=0;
 scl=1;

 din=date2;
 scl=0;
 scl=1;

 din=date1;
 scl=0;
 scl=1;

 din=date0;
 scl=0;
 scl=1;
 }
void write_5615(uint k)
 {
    k<<=2;
    cs1=0;
 write_sip5615(k>>8); //Send high 8 bits
 write_sip5615(k); //send the lower eight bits
 cs1=1;
 }
void main()
 {
   uint k1=0,k2=0,k3=0,k4=0,i=0,j=0,x=0,z,p;
   while(1)
    {
 /* w2=0;
   delay(500);
   w2=1;
   delay(500); */
   if(key1==0) //key 1 detection
    {
      k1=1;
   k2=0,k3=0,k4=0;
   while(!key1);
    }
   if(key2==0) //Key 2 detection
    {
      k2=1;
   k3=0,k1=0,k4=0;
   while(!key2);
    }
   if(key3==0) //key 3 detection
    {
      k3=1;
   k1=0,k2=0,k4=0;
   while(!key1);
    }
   if(key4==0) //key 4 detection
    {
      k4=1;
   k1=0,k2=0,k3=0;
   while(!key2);
    }
   if(k1==1)//sine wave
    {
       write_5615(sine_tab[i]);
       i++;
       delay(100);
       if(i==256)i=0;
    }
   if(k2==1)//sawtooth wave
    {
       write_5615(j);
    j++;
    delay(100);
    if(j==250)j=0;
    }
   if(k3==1)//square wave (the I/O of the microcontroller is better in this case)
    {
      write_5615(10);
   delay(10000);
   write_5615(200);
   delay(10000);
    }  
   if(k4==1)//triangle wave
   {
    for(z=0;z<301;z++)
     {
    delay(50);
    write_5615(z);
     if(z==300)
      {
     for(p=300;p>0;p--)
       {
      if(p==0)break;
       write_5615(p);
       delay(50);
    }
   }
   }
   }
 }
 }