I want to make a LED glow slowly. But haven't succeed yet. I learn only these command still now over one and half month : mov, add, clr, setb, djnz, lcall, cjne, rr, rl,swap, jnb, jb, ret, nop,jmp, sjmp, jz, jnz. So, is it possible to make a led dimmer with with these instruction?
The two you need are SETB and CLR.... these turn off / on an LED connected ( via a transistor ) to a micro pin..
you then place the code in a forever loop with a variable delay between these two commands
Code:
var1 equ 250 ; on time
var2 equ 50 ; off time
loop:
mov R0, #var1
setb P0.0
on:
djnz R0, on ; wait here for on time
mov R0, #var2
clr P0.0
off:
djnz R0, off ; wait here for off time
jmp loop
end
Something like this... To make the LED come on slowly... Increase var2 while decreasing var1..