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PIC16F877A data acquisition

 
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PIC16F877A data acquisition
PostPosted: Thu Apr 21, 2005 9:49 am     Reply with quote
Hi all,

I�ve just started learning PIC16F877A, before this I experienced a lot with 16F84A using CCS PIC C. I had never used A/D converter uC before this. Basically I want to read analog signal by A/D converter and display the result on RS232 terminal software at an interval of say 1sec. So can anybody please give me source code, so as to learn how to program it?

Thanks a lot
DragonPIC



Joined: 11 Nov 2003
Posts: 118

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PostPosted: Thu Apr 21, 2005 12:24 pm     Reply with quote
Code:
void init(void)         //initialization
{
   port_a = a_start;

   setup_adc_ports(RA0_ANALOG_RA3_RA2_REF);
   setup_adc(ADC_CLOCK_DIV_2);         //MIGHT HAVE TO BE DIV_32 OR DIV_64
   set_adc_channel(0);

   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);

   sleep_timer = 0x0000;
   set_timer1(0);
   setup_timer_1(t1_internal|t1_div_by_1);
   enable_interrupts(int_timer1);
   enable_interrupts(global);

   set_tris_a(a_dirs);
   set_tris_b(b_dirs);
   port_b_pullups(TRUE);
   set_tris_c(c_dirs);

   port_a = a_def;
   port_b = b_def;
   port_c = c_def;

//   while((port_b & 0xF1) != 0xF1);      //make sure int pin is in default state before continueing

   delay_ms(900);
}

void battery_test(void)
{
   battery = read_adc();
   if (battery > full)
      battery = full;
   if (battery > dead)
      percent = ((battery-dead) * 10) / bat_div;         //compute battery charge
   else
      percent = 0;

      printf("\r\nBattery = %lu%%\r\n", percent);   //display charge percentage
}


here is a quick chunk of some of my code on a 876A.

don't forget the #device adc=10 (#device adc=8 if you are doing 8bit conversion) in your *.h file.

Hope this helps..
_________________
-Matt
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