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DS1302 problem working with 18f4550

 
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theasus



Joined: 31 May 2009
Posts: 79

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DS1302 problem working with 18f4550
PostPosted: Sun Feb 21, 2010 4:03 am     Reply with quote

I can use DS1302 with PIC16F877A. But I can't use DS1302 with 184550.
I couldn't understand the problem. Nothing appears on LCD.

Here is my code:
Code:

#include <18F4550.h>
#FUSES NOWDT                    //No Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES HS                       //High speed Osc (> 4mhz)
#FUSES NOPROTECT                //Code not protected from reading
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES BORV20                   //Brownout reset at 2.0V
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOCPD                    //No EE protection
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES LVP                      //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOMCLR                     //Master Clear pin enabled

#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#define use_portd_lcd TRUE

#include <lcd.c>     
#include <DS1302.c> 

byte hour,minute,second;

void main()
{
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_vref(FALSE);
   lcd_init(); 
   rtc_init();
   rtc_set_datetime(21,02,10,6,12,52);
   
   while(true)
   {
      rtc_get_time(hour,minute,second);           
      printf(lcd_putc,"\nTime:%02d:%02d:%02d",hour,minute,second);
      delay_ms(1000);
   }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Feb 21, 2010 1:48 pm     Reply with quote

Quote:
#FUSES LVP

This fuse can cause the PIC to lock-up if Pin B5 goes high.
Change it to NOLVP. Do that in all your programs.

If that doesn't fix the problem, then post the list of PIC pins
that you have connected to the ds1302 chip.
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