how to make running led using atmega16

[M.Fakhruzzaman.Al.Faisal]

I have a question to all member in this forum, I want to make the runing led with the atmega16 but I can’t make the programs ??? anyone can help me ? please tell me

[dagakshay]

how many LEDS to want to interface…

 

algo for simple running 8 LEDs:

 

while(1)

{

PORTB=(1<<0);

_delay_ms(100); 

 

 

PORTB=(1<<1);

_delay_ms(100);

 

PORTB=(1<<2);

_delay_ms(100);

 

PORTB=(1<<3);

_delay_ms(100);

 

PORTB=(1<<4);

_delay_ms(100);

 

PORTB=(1<<5);

_delay_ms(100);

 

PORTB=(1<<6);

_delay_ms(100);

 

PORTB=(1<<7);

_delay_ms(100);

}

[M.Fakhruzzaman.Al.Faisal]

I am confused because you have entered above algo is on port B all, if it can be one input (1 pin) is for 8 LED PORTB? or means of PORTB0 to PORTB 7?? please explain, thanks

[dagakshay]

i dint get you…

are you asking for PORTB=(1<<n);

 

PORTm is use to send output on port m in avr…

 

suppose i want to make PB3 means 3rd pin of  port B as high and rest all as low i can write it as

PORTB=0b00001000; // b stands for binary…

PORTB=0x80; // here x stand for hexadecimal…

or

PORTB=(1<<PB3);

PORTB=(1<<3);

 

 

if you want to put multiple pin as output (in a port) you can use:

PORTm=(1<<n)|(1<<n’)|(1<<n”);

 

but remember in above statement on n n’ n” pin will be high and rest all will be low…

 

and if you want to change only a single pin with out affecting the rest of port values use bit wise operation…. 

[Amit Joshi]

 i think it is also can be done by

 

// for left shift

for(i=0;i<6;i++)

{

PORTx = (PORTx<<1);  

_delay_ms(1000);

}

 

 // for right shift

for(i=0;i<6;i++)

{

PORTx = (PORTx<<1); 

_delay_ms(1000);

}

 

 // for cicular shift

while(1)

{

PORTx = (PORTx<<1)|(PORTx>>7); 

_delay_ms(1000);

}

[dagakshay]

for right shift

PORTx=(PORTx>>1); 

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