Which chip do i use?

[mackrackit]

MCLRE is just the name.
For internal (Not used for reset but the pins other functions) the fuse should be
_MCLRE_OFF

HS for the OSC

[The Master]

Woo it works Its a bit fast though. i put 100ms pauses in and it flashes a lot faster than when i use a 4MHz resonator. I know 16MHz is 4 times faster but i thought the point of declaring that was so "pause 100" would still take 100ms and not 25. Maby ive got something else wrong. I was reading about timers in the datasheet. I didnt understand any of it but part of it could mean the chip runs 4 times faster than the resonator you use.

It doesnt matter anyway. If i want 100ms then i just type 400. The point is the LED flashes. Tomoz ill get onto the real code but its 10:00 now so i should be getting to bed. Up at 4:30AM for work

Anyways. Thanx for that. I would have been lost trying to figure it out myself

[mackrackit]

Where are you setting the fuses? In the *.inc file or in the code.

A programmer never sleeps. When things get fuzzy is when some of the best work is done

[The Master]

Im setting the fuses in the programmer software right after loading the file. How do you do it in PBP? Its annoying having to keep setting them.

Also, Serial doesnt appear to be working. This is probs to do with the same problem but how do i figure out what value to give to spbrg? I found this page but im not sure what it all means. I entered 16 and it gives me a table. How do i know what BRGH is set to?

Edit: Just downloaded a calculator from Mister_e's website. It makes more sense but its still not working. I think ill go sleep on it

[The Master]

Solved the oscillator problem.

"DEFINE osc 16" doesnt work
"DEFINE OSC 16" does work

Serial still not working but i have a feeling thats something simple.

Ive tried 2 things from Mister-e's calculator

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER_SPBRG 25  ' 9600 Baud @ 16MHz, 0.16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

RCSTA = $90 ' Enable serial port & continuous receive
TXSTA = $20 ' Enable transmit, BRGH = 0
SPBRG = 25  ' 9600 Baud @ 16MHz, 0.16%

I have also added this code

loop:
if pir1.5=1 then
          newbyte=rcreg
          high portb.0
          pause 100
          low portb.0
endif
goto loop

when any serial data comes in that should make the LED flash but its not doing. I think this might be to do with the circuit itself (currently thinking outside of the box. Using breadboard instead). Ill try and solve that tomoz. For now though i really am going to bed :P Ill let you know how it goes tomoz

[mister_e]

if you don't use any HSERIN/HSEROUT you use the second methode, unless you use the DEFINE method.

this one work here

        @   __CONFIG _HS_OSC & _LVP_OFF
        DEFINE OSC 20
        
        PORTB=0
        TRISB = %00000010
        RCSTA = $90 ' Enable serial port & continuous receive
        TXSTA = $24 ' Enable transmit, BRGH = 1
        SPBRG = 129 ' 9600 Baud @ 20MHz, 0.16%
            
        PIE1.5 = 1  ' Enable USART interrupt
        

start:
        if PIR1.5 = 1 THEN  ' RCIF FULL?
                PORTB.0=1
                PAUSE 200
                PORTB.0=0
                WHILE PIR1.5 
                    TXREG=RCREG ' send it back to the pc
                                ' utill USART buffer is empty
                    wend
                
                if RCSTA.1=1 THEN  ' ANY Overrun?
                    RCSTA.4=0      '  YES clear it
                    RCSTA.4=1      '
                    ENDIF
                    
                endif
                
        goto start

just change DEFINE OSC, TXSTA and SPBRG to suite your requirement. Make sure you have a RS232 inverter (MAX232 or else) between your PC and your PIC.

And YES the DEFINE's have to be in capital letter, unless it will never work.

[The Master]

Thanx for the code. Just a few questions on it. "@ __CONFIG _HS_OSC & _LVP_OFF" causes an error.

Why do i need an "RS232 inverter"? Serial works fine through serin2. I think Matt did use one because theres some extra stuff on the serial input but i wasnt sure what it was for. It appears to be an optoisolator and a diode