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[RESOLVED]18f4550 and ds18x20

 
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blackdragon



Joined: 24 May 2010
Posts: 10

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[RESOLVED]18f4550 and ds18x20
PostPosted: Mon May 24, 2010 7:28 pm     Reply with quote

Hi folks,

I'm trying to communicate ds18s20/18b20 with pic18f4550 but I didn't implement. I've already searched all CCS forum pages but my issue is still alive.
When I start the ISIS simulation I'm just seeing -0.5 degree in LCD panel.

My sources as below;

Code:

/*///////////////////////////////////
main.c
////////////////////////////////////*/

#include <18F4550.h>

#device  ADC=10
#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 IESO                     //Internal External Switch Over mode enabled
#FUSES BROWNOUT                 //Reset when brownout detected
#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 NOEBTR                   //Memory not protected from table reads
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES NOPBADEN                 //PORTB pins are configured as digital I/O on RESET
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES NOMCLR                   //Master Clear pin disabled
//#fuses   NOWDT, INTRC_IO, MCLR, PUT, NOPROTECT, BROWNOUT, NOLVP, NOCPD
#use     delay(clock=48000000)
#define use_portb_lcd True

#include <lcd.c>

#include "ds18b20.c"


void main(void)
{
   float temperature;
   lcd_init();

   while(1)
   {
      temperature = ds1820_read();
      printf(lcd_putc,"\f%3.1f%cC", temperature,223);


   }
 
}




Code:

/*///////////////////////////////////
ds18b20.c
////////////////////////////////////*/

#define ONE_WIRE_PIN PIN_A1

void onewire_reset()
{
   output_low(ONE_WIRE_PIN);
   delay_us( 500 ); //1-wire resetleme için sıfıra çekilir
   output_float(ONE_WIRE_PIN); //1-wire bir yapılır
   delay_us( 500 ); // sensörün hazırlanması için beklenir.
   output_float(ONE_WIRE_PIN);
}

void onewire_write(int data)
{
   int count;
   for (count = 0; count < 8; count++)
   {
      output_low(ONE_WIRE_PIN);
      delay_us( 2 ); // Sensöre yazma işlemine başlamak için  1-wire sıfıra çekilir.
      output_bit(ONE_WIRE_PIN, shift_right(&data,1,0)); // yazılacak bilgi 1-wire'da
      delay_us( 60 ); // Yazma işlemi zamanı doldurulur.
      output_float(ONE_WIRE_PIN); // 1-wire bir yapılır,
      delay_us( 2 ); // 1us'den fazla beklenir.
   }
}

int onewire_read()
{
   int count, data;
   for (count = 0; count < 8; count++)
   {
      output_low(ONE_WIRE_PIN);
      delay_us(2); //Sensördem okuma işlemi içinl 1-wire sıfıra çekilir.
      output_float(ONE_WIRE_PIN); //1-wire bir yapılır,
      delay_us(8); // Sensörün kendine gelmesi beklenir,
      shift_right(&data, 1, input(ONE_WIRE_PIN)); // sonuc bilgisi alınır.
      delay_us(120); //Okuma işlemi zamanı doldurulur.
}
return( data );
}

float ds1820_read()
{
   int8 busy = 0, temp1, temp2;
   signed int16 temp3;   
   float result;
   
   onewire_reset();
   onewire_write(0xCC);
   onewire_write(0x44);
   
   while (busy == 0)
      busy = onewire_read();
     
   onewire_reset();
   onewire_write(0xCC);
   onewire_write(0xBE);
   
   temp1 = onewire_read();
   temp2 = onewire_read();
   temp3 = make16(temp2, temp1);
   
   result = (float) temp3 / 2.0;
   delay_ms(20);
   
   return result;
}


Any idea or help would be more than welcome

thanks & regards


Last edited by blackdragon on Tue May 25, 2010 3:37 pm; edited 2 times in total
PCM programmer



Joined: 06 Sep 2003
Posts: 20100

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PostPosted: Mon May 24, 2010 8:04 pm     Reply with quote

You got that driver from the Code Library. It has a 3-page thread on
the ds18B20. If you read page 3, then you will see how it explains
about your problem with Proteus.

Read ishmael's post:
http://www.ccsinfo.com/forum/viewtopic.php?t=28425&start=34
Then read a little farther down, and he explains how to solve it.
blackdragon



Joined: 24 May 2010
Posts: 10

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PostPosted: Mon May 24, 2010 11:54 pm     Reply with quote

thanks for reply PCM programmer, but same problem still counting

any idea?
blackdragon



Joined: 24 May 2010
Posts: 10

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PostPosted: Tue May 25, 2010 12:40 pm     Reply with quote

folks I solved my problem so I changed some code blocks now it works.

::::::::::::::::: ds18b20 :::::::::::::::::::::::::
Code:


#define DS1820_WIRE_PIN                PIN_A1   //ds1820 data bacağı
//sensör için  sabitler
#define DS1820_SKIP_ROM                0xCC
#define DS1820_READ_SCRATCHPAD         0xBE
#define DS1820_CONVERT_T               0x44


static char g_shiftBit, g_dataOut;
static long g_temperature, g_dataInput;


void resetDS1820(void)
{
   output_low(DS1820_WIRE_PIN);     //1-wire resetleme için sıfıra çekilir
   delay_us(500);                   // sensörün hazırlanması için beklenir.
   output_float(DS1820_WIRE_PIN);   //1-wire bir yapılır
   delay_us(500);                   // sensörün hazırlanması için beklenir.

}

void writeDS1820(void)
{
   for (g_shiftBit = 1; g_shiftBit <= 8; ++g_shiftBit)
   {
      output_low(DS1820_WIRE_PIN);                                    // Sensöre yazma işlemine başlamak için  1-wire sıfıra çekilir.
      delay_us(2);
      output_bit(DS1820_WIRE_PIN, shift_right(&g_dataOut, 1, 0));    // yazılacak bilgi 1-wire'da
      delay_us(60);                                                  // Yazma işlemi zamanı doldurulur.
      output_float(DS1820_WIRE_PIN);                                 // 1-wire bir yapılır,
      delay_us(2);                                                   // 1us'den fazla beklenir.
   }
}

void readDS1820(void)
{
   g_dataInput = 0;
   for ( g_shiftBit = 1; g_shiftBit <= 16; ++g_shiftBit )
   {
      output_low(DS1820_WIRE_PIN);                                   //Sensörden okuma işlemi içinl 1-wire sıfıra çekilir.
      delay_us(2);                                                   
      output_float(DS1820_WIRE_PIN);                                //1-wire(data) bir yapılır,
      delay_us(8);                                                  // Sensörün kendine gelmesi beklenir,
      shift_right ( &g_dataInput, 2, input ( DS1820_WIRE_PIN ));   // sonuc bilgisi alınır
      delay_us(120);                                              //Okuma işlemi zamanı doldurulur.
   }
 
}
void waitForConversion (void)             
{
    while(TRUE)
    {
       output_low(DS1820_WIRE_PIN);
       delay_us(5);
       output_float(DS1820_WIRE_PIN);
       delay_us(5);
       if (input(DS1820_WIRE_PIN) == 1)   
       {
           break;
       }
       delay_us(55);
     }
}


long ds1820_read()
{
   
    resetDS1820();
    g_dataOut = DS1820_SKIP_ROM;
    writeDS1820();
    g_dataOut = DS1820_CONVERT_T;
    writeDS1820();
    waitForConversion();

    resetDS1820();
    g_dataOut = DS1820_SKIP_ROM;
    writeDS1820();
    g_dataOut = DS1820_READ_SCRATCHPAD;
    writeDS1820();
    readDS1820();
    g_temperature = g_dataInput / 16; //ds18s20 için bu değer 2 olacaktır

   
   return g_temperature;
}


::::::::::::::: main.c :::::::::::::::::::
Code:

/*///////////////////////////////////
main.c

////////////////////////////////////*/

#include <18F4550.h>

#FUSES  NOPROTECT, NOPUT, NOWDT, NOBROWNOUT, NOLVP, NOCPD, NOWRT, NOMCLR

#use   delay(clock=4000000)
#define use_portb_lcd True

#include <lcd.c>
#include "ds18b20.c"


void main(void)
{
   float temperature;
   lcd_init();
     printf(lcd_putc,"test");
     
   while(1)
   {
      temperature = ds1820_read();
      printf(lcd_putc,"\f%3.1f%cC", temperature, 223);
   }

}
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