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DS1616 temperature

 
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bubbi
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DS1616 temperature
PostPosted: Sat Jul 10, 2004 11:51 am     Reply with quote
Hi there,
I can't read the temperature out of this IC.
My functions always return 0.

Can anyone give me a hint?

Thanks


My code:
Code:

#include "TempLogger.h"

#define TMP_SCLK PIN_B1
#define TMP_IO   PIN_B3
#define TMP_RST  PIN_B2

BYTE temperatur=0;
char c;


BYTE read_ds1616(BYTE cmd) {
   BYTE i,data;

   output_high(TMP_RST);
   write_ds1616_byte(cmd);

   for(i=0;i<=7;++i) {
      shift_right(&data,1,input(TMP_IO));
      output_high(TMP_SCLK);
      delay_us(2);
      output_low(TMP_SCLK);
      delay_us(2);
   }
   output_low(TMP_RST);
   return(data);
}

BYTE TMP_get_temp() {
   BYTE temp;
   temp = read_ds1616(0x55);      // Get Temperature
   return(temp);
}

void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_counters(RTCC_INTERNAL,RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);

   while(1)
   {
      zeichen=getch();
     
      if (c=='2') {
         printf("HiThere\n\r");
      }
      if (c=='1') {

         temperatur=TMP_get_temp();
         printf("temp: %i\n\r",temperatur);  //output RS232

      }


   }

}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jul 11, 2004 9:53 pm     Reply with quote
Look at the source code posted on this page:
http://sjeffroy.free.fr/GBF_num_/DS1615_-_DS1616/ds1615_-_ds1616.html

Especially look at the code for this function:
ds1616_temp()

Notice he is doing two things that you are not doing:

1. He tests the CS0 bit in the Control 2 register. If the CS0 bit
is not = 1, then he sets it = 1.

2. He sends the command (0x55) to read the temperature.
But before he reads the temperature value, he checks the DR
bit in the Status 1 register. When DR = 1, then he reads the
temperature.

If you make these two changes to your code, it will probably work.
----
bubbi
Guest
PostPosted: Mon Jul 12, 2004 4:04 am     Reply with quote
Thanks !!!
This page helps me a lot
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