NHD-0216KZW/ 0216SZW/ 0220DZW/ 0420DZW - (4-bit)

Example code for Newhaven OLED display NHD-0216KZW/ 0220DZW/ 0420DZW - (4-bit) models.

#include <reg52.H>
//---------------------------------------------------------

sbit E = P3^4; 
sbit D_I = P3^0;
sbit R_W = P3^7;
void Nybble();

void Delayms(int n){
	int i;
	int j;
	for (i=0;i<n;i++)
		for (j=0;j<1000;j++)
		{;}
}

void command(char i){
	P1 = i;
	D_I =0;
	R_W =0;
	Nybble();
	i = i<<4;
	P1 = i;
	Nybble();
}
void write(char i){
	P1 = i;
	D_I =1;
	R_W =0;
	Nybble();
	i = i<<4;
	P1 = i;
	Nybble();
}
void Nybble()
{
	E = 1;
	Delayms(1);
	E = 0;
}


void init(){
	P1 = 0;
	P3 = 0;
	Delayms(15);
//	P1 = 0x30;
	Delayms(50);
	Nybble();
	Delayms(50);
	Nybble();
	Delayms(5);
	Nybble();
	Delayms(5);
	P1= 0x20;
	Nybble();
	Delayms(5);
	command(0x28);
	Delayms(5);
	command(0x10);
	Delayms(5);
	command(0x0C);
	Delayms(5);
	command(0x06);
	Delayms(5);
}
		  
void Output()
{	
	code char text1[] = {"Newhaven Display Int"};
	code char text2[] = {"4 Lines 20 Character"};
	code char text3[] = {"    Yellow  OLED    "};
	code char text4[] = {"4-bit initialization"};
	int i;
	command(0x02);
	for (i=0;i<20;i++){
		write(text1[i]);
	}
	 command(0xc0);
	 for (i=0;i<20;i++){
		write(text2[i]);
	}
	command(0x94);
	for (i=0;i<20;i++){
		write(text3[i]);
	}
	 command(0xd4);
	 for (i=0;i<20;i++){
		write(text4[i]);
	}
}
	  
void main(void) {
	P1=0;
	P3=0;
	
	while(1){
			Delayms(10);
			init();
			command(0x01);
			command(0x02);
			command(0x80);
			Output();
			Delayms(10);

	}
}