Navtex Receiver

[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.

[santamaria]

Thanks for your reply mister_e. Tomorrow i will try in PBP and i will tell you my results.

[santamaria]

i am using darrel's interrupts and 20MHz crystal. With mister_e calculator i found that i want prescaler 1:32 and preload 99 into tmr0.I don't know how to preload the value into timer.below i have the interrupt routine of my program. Is this correct for preload the value?


'---[TMR0 - interrupt handler]--------------------------------------------------
Tick0: ;every 1ms occurs

;make space for new sample
cp_old=cp_new ;save old value
cp_new.highbyte=CCPR1H ;take new capture
cp_new.lowbyte=CCPR1L
gosub samplebit ;take the sample bit

TMR0=99

@ INT_RETURN

thanks