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GPS example

 
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runo



Joined: 08 Oct 2013
Posts: 1

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GPS example
PostPosted: Tue Oct 08, 2013 4:29 pm     Reply with quote
(GPS with pic 16f877a) how do communications ?(example for gps )
Help me please ?
Code:

#include <main.h>
#fuses XT,WDT,NOPROTECT,NOBROWNOUT,NOLVP,NOPUT,NOWRT,NODEBUG,NOCPD
#use delay (clock=4000000)
#use rs232 (baud=9600, xmit=pin_C6, rcv=pin_C7, parity=N, stop=1,ERRORS)

char klavye[50];

#int_rda
void serihaberlesme_kesmesi()
{
disable_interrupts(int_rda);

output_high(pin_d0);

gets(klavye);
delay_ms(2000);
output_low(pin_d0);
}


void main()
{
    setup_adc_ports(NO_ANALOGS);
    setup_adc(ADC_OFF);
    setup_psp(PSP_DISABLED);
    setup_spi(SPI_SS_DISABLED);
    setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
    setup_timer_1(T1_DISABLED);
    setup_timer_2(T2_DISABLED,0,1);
    setup_CCP1(CCP_OFF);
    setup_CCP2(CCP_OFF);
 
    enable_interrupts(GLOBAL);
    printf("AT");
    putchar(0x0D);
 
   while(1)
    {
      enable_interrupts(int_rda);
    }
}

Why not run ?
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Tue Oct 08, 2013 7:59 pm     Reply with quote
Hi,

Frankly, your code is a mess, and we have no idea what "Why not run" means.....

A sample of issues I found on a quick scan of your code:

    1. No PIC type defined
    2. We have NO idea what's in Main.h
    3. Your serial ISR disables interrupts - not necessary
    4. Your serial ISR uses gets() - this is incorrect, it should read a SINGLE character with getc()
    5. You are repeatedly enabling int_rda in a while() loop - why???


This wheel has been invented, and re-invented many times here on the forum, so I suggest you spend a few hours reading the forum archives.....

Seriously, before you even think of a GPS project, at least get your PIC to flash an LED. Learn to crawl before you try to run!

John
TMLtech



Joined: 20 Jul 2011
Posts: 21
Location: Finland

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PostPosted: Thu Oct 10, 2013 3:40 am     Reply with quote
And there is huge delay inside the interrupt vector.
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