how to create a 1 second delay Arduino - arduino

Question

Hi i'm new to Arduino and i'm trying to create a 1 second delay but i don't know how i can generate a code that completes the delay_ms function
I've tried to work it out but doesn't seem to get any better
Thank you
void setup()
{
word millisecs;
Serial.begin(9600);
}
void setup() asm volatile(
" ldi r16,0x3F ; r16 = 00111111\n"
" out 4,r16 ; set pins 8-13 as outputs in DDRB\n"
::: "r16");
millisecs = 1000; // 1s blink delay
Serial.begin(9600);
}
void loop()
{
long starttime = millis(); // make a note of the start time
asm volatile(
// jump to "blink" - ie jump around the delay_ms subroutine
" rjmp blink%= ; relative jump to 'blink' \n"
" ldi r16,0x3F ; r16 = 00111111\n"
" out 4,r16 ; set pins 8-13 as outputs in DDRB\n"
::: "r16");
registers used:
r31 - millisecond count (lo byte)
r30 - millisecond count (hi byte)
r17 - 100 microsecond count
r16 - 1 microsecond count
Overall delay (ms) = r30:r31 * r17 * r16
---------------------------------------------------------------------*/
"delay_ms%=: nop ; code to replace nop \n"
"delay_100us%=: nop ; code to replace nop \n"
"delay_1us%=: nop ; code to replace nop \n"
" sbiw r30,1 ; decrement ms count (r31:r30)\n"
" brne delay_ms%= ; loop to delay_ms while > 0 \n"
" ret ; return from subroutine \n"

Answer 1

There is a built in to do this
http://arduino.cc/en/Reference/delay
you just give it the number of ms to delay. So for one second
delay(1000)

Answer 2

You are working way too hard for something so simple. See BlinkWithoutDelay (code below). That code is also part of the Arduino examples which get installed when you install the Arduino IDE. Lots of good learning examples in there. (Oh - the code uses a long for the var previousMillis. That is an error (imo). It would be better to use an unsigned long.)
You also have the option of using Timer interrupts but for a simple second delay (esp. if you don't have much experience), I would suggest the method above and do it all in code that is simple to understand.
/* Blink without Delay
Turns on and off a light emitting diode(LED) connected to a digital
pin, without using the delay() function. This means that other code
can run at the same time without being interrupted by the LED code.
The circuit:
* LED attached from pin 13 to ground.
* Note: on most Arduinos, there is already an LED on the board
that's attached to pin 13, so no hardware is needed for this example.
created 2005
by David A. Mellis
modified 8 Feb 2010
by Paul Stoffregen
This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
*/
// constants won't change. Used here to
// set pin numbers:
const int ledPin = 13; // the number of the LED pin
// Variables will change:
int ledState = LOW; // ledState used to set the LED
long previousMillis = 0; // will store last time LED was updated
// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 1000; // interval at which to blink (milliseconds)
void setup() {
// set the digital pin as output:
pinMode(ledPin, OUTPUT);
}
void loop()
{
// here is where you'd put code that needs to be running all the time.
// check to see if it's time to blink the LED; that is, if the
// difference between the current time and last time you blinked
// the LED is bigger than the interval at which you want to
// blink the LED.
unsigned long currentMillis = millis();
if(currentMillis - previousMillis > interval) {
// save the last time you blinked the LED
previousMillis = currentMillis;
// if the LED is off turn it on and vice-versa:
if (ledState == LOW)
ledState = HIGH;
else
ledState = LOW;
// set the LED with the ledState of the variable:
digitalWrite(ledPin, ledState);
}
}