Navtex Receiver

[mister_e]

It's already done in your code...

__CONFIG _CP_OFF& _WDT_OFF & _PWRTE_ON & _HS_OSC & _LVP_OFF & _BODEN_ON

syntax is syntax, seems to miss a space between _CP_OFF and the &... if you have any compilation error, it might just forget the config fuses?

Which device programmer do you have?

With the same config line, did you tried a simple Led Blink program?

Is there any chance to have

1. the schematic of it?
2. A picture of your current Prototype?

If you're using an o-scope to monitor your crystal... make sure you set your probe to 10X or 100X, unless you'll just screw the poor osc signal.

[santamaria]

mister e i will explain you what i am doing. i download the above code from net and i compiled with mplab(succesfull). i burn the 16f876 and the chip doesn't start.in the same breadboard i made a sample program to test the lcd screen in pbp.it works like a charm.everything is the same exept the programm. If i understand correct my problem is with crystal config.the sample programm that i made has the same configuration bits and works(i didn't write the line a made it manualy from programmer).i am thinking to check now with XT config to see what happends. I use usb programmer from melabs and also i found from my friend the picstart plus and i tried it with mplab with no success.i put the navtex code in microcode studio but i had a lot of errors and i leave it .the diagramm is below if can be help you.i did't made it all ,only the digital circuit i build (pic ,lcd,max232,buttons), the receiver i don't want it now i want to check the decoder first and the lcd screen.Also i am not checking only the crystal with scope , by the programm must give my 500KHz in 12 pin.What else can i do?

[santamaria]

finally it works.... i would like to ask how i can pass this code to microcode studio and execute the labels that i want(and interrupts)?

[santamaria]

below is my sample fsk decoder similar to above code.i would like to ask how can i check if it is in phase or not and how i can read the bits that receiving in main programm? i upload also the specific assembly code for checking the phase.

thanks

[mister_e]

in your asm code... ; if sample = inphase then donothing

think about it a little bit

[santamaria]

I stack now. I know that one sitor bit is 10msec. so i use tmr0 to find if it is in phase with samples, but how i know if i am in the start of sitor bit or in 3 msec after? I say that 10 samples is 1 sitor bit ok but i don't know if i start from the begining.Can you explain it to me mister_e?

[mister_e]

Here's a tips on how to mix ASM and PBP.

        '    Using PIC16F88
        @ DEVICE INTRC_OSC, LVP_OFF, WDT_OFF, MCLR_OFF
        
        DEFINE OSC 4
        OSCCON=%01101000
        ANSEL=%00000000
        CMCON=%00000111
        
        trisa = %11111111
        trisb = %00000001
    
        DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
        DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
        DEFINE HSER_SPBRG 25  ' 9600 Baud @ 4MHz, 0.16%
        DEFINE HSER_CLROERR 1 ' Clear overflow automatically
            
        CounterA    var byte BANK0
        CLEAR
        
Start:
        asm
                CHK?RP PORTB
                BTFSC   PORTB,0
                GOTO $-1
                INCF _CounterA,F
        ENDASM                
        HSEROUT ["CounterA=",DEC CounterA,13,10]
        PAUSE 200
        GOTO START

You define your variable in PBP, then you access them in ASM. Possible to use the other way... BUT not 100% sure if this is safe though... sure it isn't 'cause you can't know for sure where PBP will place it's own variables.