Interface a DAC and generate Triangular and Square waveforms

Interface a DAC and generate Triangular and Square waveforms

Program:-

Square Waveform:-

#include <lpc21xx.h>
void delay(void);
int main ()
{
PINSEL0 = 0x00000000 ; // Configure P0.0 to P0.15 as GPIO
PINSEL1 = 0x00000000 ; // Configure P0.16 to P0.31 as GPIO
IO0DIR = 0x00FF0000 ;
while(1)
 {
 IO0PIN = 0x00000000;
 delay();
 IO0PIN = 0x00FF0000;
 delay();
 }
} 
void delay(void)
{
unsigned int i=0;
 for(i=0;i<=500;i++);
}

Triangular Waveform:-

#include <LPC21xx.h>
unsigned long int temp=0x00000000; 
int main ()
{
 unsigned int i=0;
 IO0DIR=0x00FF0000;
 while(1)
 {
 // output 0 to FE 
 for(i=0;i!=0xFF;i++)
 {
 temp=i;
 temp = temp << 16;
 IO0PIN=temp;
 }
// output FF to 1 
 for(i=0xFF; i!=0;i--)
 {
 temp=i;
 temp = temp << 16;
 IO0PIN=temp;
 }
}//End of while(1)
}//End of main()