Help in Scrolling LEDs

Other Hardware LEDs and Multiplexing
1

Hello, I wonder how to do this in arduino:

  1. I have 8 leds.
  2. I have to shift per 1 bit.
    in Zilog Microcontroller, I do this:
int dataShift = 0x80 //Start from the value leftmost bit
for_loop... from 1 to 8
if(dataShift==0x00) dataShit = 0x80; //reset if data becomes 0
PAOUT = dataShift; 
dataShift=dataShift>>1; //shift 1 bit at a time

The codes above is only for shifting one bit at a time.
But here comes my problem:

I have to shift one bit at a time, but when it comes to the right most bit, the display will be still. Ughh, I can't describe it well. But I have a picture below.

loop[0] = 1000 0000 up to 0000 0001
loop[1] = 1000 0001 up to 0000 0011
loop[2] = 1000 0011 up to 0000 0111

until 1's occupy the whole octet. Please help. :slight_smile:

2

This might do it:

for (x=0; x<0x80; x=x<<1){
x=x | 0x01; // 00000001, 00000011, 00000111, 00001111 ...
datashift = 0x80 | x; // 10000001, 10000011, 10000111, 10001111 ...
}
3

Hello sir, what I am trying to do is this:

here is my code (in Zilog):

#include <ez8.h>


void delay(void){
	int x,y;
	for(x=0;x<=500;x++)
		for(y=0;y<=512;y++);
	}
	

void main(){
	int x=0;
	int dataShift = 0x80;
	
	PADD = 0x00;
	PAAF = 0x00;
	PAOC = 0x00;
	PAHDE = 0xFF;
	
	
	while(1){
		
		
		/*LOOP1*/
		PAOUT = ~0x80;	delay();
		PAOUT = ~0x40;	delay();
		PAOUT = ~0x20;	delay();
		PAOUT = ~0x10;	delay();
		PAOUT = ~0x08;	delay();
		PAOUT = ~0x04;	delay();
		PAOUT = ~0x02;	delay();
		PAOUT = ~0x01;	delay();
		/*end of loop1*/
		
		/*LOOP2*/	
		PAOUT = ~0x81;	delay();
		PAOUT = ~0x41;	delay();
		PAOUT = ~0x21;	delay();
		PAOUT = ~0x11;	delay();
		PAOUT = ~0x09;	delay();
		PAOUT = ~0x05;	delay();
		PAOUT = ~0x03;	delay();	
		/*end of loop2*/
			
		/*LOOP3*/	
		PAOUT = ~0x83;	delay();
		PAOUT = ~0x43;	delay();
		PAOUT = ~0x23;	delay();
		PAOUT = ~0x13;	delay();
		PAOUT = ~0x0B;	delay();
		PAOUT = ~0x07;	delay();	
		/*end of loop3*/	
		
		/*LOOP4*/
		PAOUT = ~0x87;	delay();
		PAOUT = ~0x47;	delay();
		PAOUT = ~0x27;	delay();
		PAOUT = ~0x17;	delay();
		PAOUT = ~0x0f;	delay();
		/*end of loop4*/
		
		/*LOOP5*/
		PAOUT = ~0x8f;	delay();
		PAOUT = ~0x4f;	delay();
		PAOUT = ~0x2f;	delay();
		PAOUT = ~0x1f;	delay();
		/*end of loop5*/
		
		/*LOOP6*/
		PAOUT = ~0x9f;	delay();
		PAOUT = ~0x5f;	delay();
		PAOUT = ~0x3f;	delay();
		/*end of loop6*/
		
		/*LOOP7*/
		PAOUT = ~0xbf;	delay();
		PAOUT = ~0x7f;	delay();
		/*end of loop7*/
		
		/*LOOP8*/
		PAOUT = ~0xff;	delay();
		/*end of loop8*/
		
		}
	
	
	}
4

It's not tested with LED's and it is not elegant but something like this...

const byte ledPins[] = {2,3,4,5,6,7,8,9};   // List of pins the LED's are connected to

void setup(){
  Serial.begin(115200);
  Serial.println("Begin");
  for (byte x = 0; x < sizeof(ledPins); x++){
    pinMode(ledPins[x],OUTPUT);
    digitalWrite(ledPins[x],LOW);
  }
}

void loop() {
  byte x,y;
  for (x = 0; x < sizeof(ledPins); x++){
    for (y = sizeof(ledPins); y > x; y--){
      digitalWrite(ledPins[y-1],HIGH);
      delay(100);
      digitalWrite(ledPins[y-1],LOW);
      Serial.print(ledPins[y-1]);
      Serial.print(" ");
    }
    digitalWrite(ledPins[y],HIGH);
    Serial.print(ledPins[y]);
    Serial.println();
  }
  Serial.println("End");
  while (1){};
}

The problem with trying to convert the Z80 code is the UNO only has one 8 bit port but it includes pin 0 & 1 so if you want to use serial then this rules out direct port manipulation of D