AVR-Chat

At 04:26 AM 14/02/2006, you wrote:
>fastest way to go about reading a fixe number of bytes into an
>array/memory location using assembler?
>
>char mydata[256];
>void myloop()
>     {
>     for(d=256;d;d--) mydata[d]=PIND;
>     }

ldi     xl,low(mydata)
ldi     xh,high(mydata) ;use x as pointer
clr     counter         ;use any 8 bit register

cpy_loop:
in      data_reg,pind   ;use any 8 bit register for data
st      x+,data_reg     ;save data with post increment
dec     counter
brne    cpy_loop        ;exit when 8 bit counter reaches 0 again

Regards

John Samperi

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