Encoder problem

[precision]

Hi sayzer,

Thanks for the reply.
But i don't using eny pause in my code. I also using Intrrupt for high age detect from encoder and count.
Thanks

[sayzer]

Np.

Why don't you use 20Mhz Xtall ?

Your DEFINE is 12Mhz, are you using 12Mhz Xtall ?



Regards.

[mister_e]

My rules:

1. Don't use Serout when the PIC have an internal USART, use HSEROUT instead.
2. use Timer as counter when hardware allow
3. keep ISR as short as possible to avoid latency etc etc

In this case, i guess, you could remove the interrupt and do the job by reading the Timer register. Working 'round the multiple if/then statement you can improve it.

also...

OPTION_REG = %00000000
On Interrupt Goto myint
INTCON = $90


IF PORTA.0 = 1 THEN NINE
LOOP: serOUT PORTC.6,T9600,[#b5,#b4,#b3,#b2,#b1,13]

When you start the PIC and IF PORTA.0=1 you make it jump to the ISR? Bad practice

[precision]

Thanks mister_e ,

this is my code, i use timer as counter.
but it count upto 256 and reset to 0, I see datasheet timer0 is 8 bit
how i set to tomer1 on pic16f877

'-------- PIC16F84A -----------------------
DEFINE OSC 16 ' use 16 MHZ oscillator
INCLUDE "MYLCD.BAS" ' LCD ON PORTB

input PORTA.4

OPTION_REG = %10110000 ' TMR0 clock source : RA4/T0CKI
' increment on low to high transition
' Prescaler assign to WDT
' WDT rate 1:1


INTCON = %10100000 ' Enable global interrupt
' Enable TMR0 overflow interrupt

ClockInput var PORTA.4 ' Input pin for signal
COUNTER var word ' Result of count to be send to 7 segment display
OverFlowVar var word


COUNTER = 0 ' set initial value of count
TMR0 = 0 ' reset prescaller
on interrupt goto MyInit



LOOP:
lcdout $fe,1
lcdout "count ", dec5 COUNTER
pause 20

COUNTER = OverFlowVar+ TMR0
OverFlowVar = 0 ' Reset OverFlowVar
goto Loop


disable
MyInit:

OverFlowVar = OverFlowVar + 65535
INTCON.2 = 0 ' clear overflow flag
TMR0 = 0 ' reload TMR0
resume
enable

[mister_e]

As per the datasheet you'll have to use the PORTC.0 pin.

T1CON=%00000110 ' Prescaller 1:1
                ' osc=off
                ' no synchro
                ' ClockSource external PORTC.0