emulator quadrature encoder

[volcane]

Hi,

you can generate two square waves with a PIC 1000 Hz out of phase with each other in advance or delay of 90 degrees?

[aratti]

Yes, you can use, just use timer1 and DT interrupt.

Assuming you will use the internal oscillator @ 8 MHz, timer1 should be set with prescaler at 1 tmr1h =252 and tmr1l = 24. This will give you the right timing.

Use the following array:

Chan VAR byte [4]
A0 VAR byte
Forward VAR bit

chan[0]=0
chan[1]=1
Chan[2]=3
Chan[3]=2


Within the ISR I will call overflow as an example you will write the following code:

Overflow:

If forward = true then

A0 = A0 + 1

If A0>3 then A0 = 0

Else

A0=A0 - 1

If A0>200 then A0 = 3

Endif

PortB = Chan[A0]

@Return

You will use portB.0 and portB.1 as your output. Set flag Forward to true (1) for channel A high prior of channel B, set flag to False (0) to reverse.

Cheers

Al.