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1Wire DS18S20- Scratchpad Problem

 
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Gast
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1Wire DS18S20- Scratchpad Problem
PostPosted: Tue Apr 26, 2005 12:16 pm     Reply with quote
Hi,

I have a problem witch the Scratchpad, it only shows ZEROS Confused
-I'm not using a Touch Sensor,
-and I have a seperat Tx and Rx Pin

-Can somebody help me with my little Program:

Code:

#include <16f870.h>

#use delay(clock=4000000)
#fuses XT,NOWDT,NOLVP

//DS1820 Commandos
#define SKIP_ROM           0xCC /* 204*/

#define CONVERT_T          0x44 /*68*/
#define READ_SCRATCHPAD    0xBE /*190*/

#define Rx_DS18S20 PIN_C4 // Rx TempSensor
#define Tx_DS18S20 PIN_C5 // Tx TempSensor

char D_Presence;
char D_ShortCircuit;

enum BITSTELLE { Bit0=1,BIT1=2,BIT2=4,BIT3=8,BIT4=16,BIT5=32,BIT6=64,BIT7=128 };

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

int temp_1,temp_2;
long int null,eins;
int scratchpad[8];


void D_Reset(void)
{
   set_tris_c(0x99);
   output_low(Tx_DS18S20); // Pin des DS18S20 auf low setzen
   delay_us(480);
   output_high(Tx_DS18S20); // Pin des DS18S20 auf high setzen
   delay_us(40);
   D_Presence = input(Rx_DS18S20);
   delay_us(350);
   D_ShortCircuit = input(Rx_DS18S20);
   delay_us(60);
}

void temp_init()
{
   output_low(Tx_DS18S20);    // Pin des DS18S20 auf low setzen
   delay_us(480);             // 480us warten
   while (input(Rx_DS18S20)); // pruefen ob der 1-wire bus auf low gezogen wird,
   delay_ms(5);
}

void temp_send(unsigned char code)
{  int n=0;

   for(; n < 8; n++)
   {  if(bit_test(code,n))
      {
         output_low(Tx_DS18S20); //sende 0
         delay_us(2); //int write slot
         output_high(Tx_DS18S20); //send 1
      }
      else
      {
         output_low(Tx_DS18S20); //sende 0
      }
      delay_us(65); //duration für 1 und fertig
      output_high(Tx_DS18S20);
      delay_us(2);
   }
   delay_us(100); //1 Millisekunde
}

unsigned char temp_read(void)
{  unsigned char in=0,j=0;

   delay_us(400);
   for(; j < 8; j++)
   {
      delay_us(1);
      output_low(Tx_DS18S20); // init read
      delay_us(3);
      if (input(Rx_DS18S20)) bit_set(in,j);
      delay_us(60);
   }
   return(in);
}


void main()
{  int i;

   printf("Hallo\r\n");

   D_Reset();
   printf("Presence:%d  ShortCircuit:%d\r\n",D_Presence,D_ShortCircuit);

   while(1)
  {   temp_init();
      temp_send(SKIP_ROM);
      temp_send(CONVERT_T);
      delay_ms(500);              //warten bis Temp Convert abgeschlossen ist...

      temp_send(SKIP_ROM);
      temp_send(READ_SCRATCHPAD);
     
      for (i=0; i<8;i++)
      {  scratchpad[i] = temp_read();
         printf("i:%d/v:%d %d %d",i,scratchpad[i],D_Presence,D_ShortCircuit);
      }

      printf("Temperatur: %d, %02u C\r\n",temp_2,temp_1);
      delay_ms(500);
   }
}



THANK YOU so much Exclamation
Almeida
Guest
erro
PostPosted: Mon Oct 09, 2006 10:03 am     Reply with quote
My friend, the ds18s20 have one port to TX and RX, (PIN_2 from DS18S20).
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