Navtex Receiver

[skimask]

That's only 40+ pages of assembly code...bit-banged serial routines, bit-banged LCD routines, and so on and so on...
I think it's time to put it in the round file and start from scratch...

[santamaria]

thanks skimast for your reply. I know how many pages are and thats why i am comfused with the program(think also that i don't know assembly).don't give me code only the steps to start building it. take out lcd and serial commands. I can't understand also when the timer0 start.after capture interrupt? and also the receiver character is not ASCII he convert it but can't translate how.

[santamaria]

when i compile the code with mplab and download it to the chip the chip doen't start. i measure with osciloscope the crystal and seems doesn't start.i face again this kind of problem and it was define different crystal value than i had in breadboard(in PBP).i am using 8 MHz crystal which working (i test it )and also i put in program that local is 8Mhz.i don't know how i can define in assembly that i am working with 8MHz crystal?

thanks

[JD123]

Set config to HS oscilator type. Aslo, using an o-scope probe on a crytal may load the crystal to the point where it quits. Use a spare port and slap it around to see if the PIC is running.

[santamaria]

I did it but the programm is not running .I will also check with XT configuration.Is it possible to define the crystal frequency in assembly as we do in PBP.?

[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?