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IO Problem, Cannot Read Inputs

 
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IO Problem, Cannot Read Inputs
PostPosted: Tue Sep 20, 2005 1:45 pm     Reply with quote
Im not sure what the problem is, but I cannot seem to read my IO pins.

I am using the PIC18F8490. I have an LCD connected (which I know works). I am just trying to change whats displayed to corresond to switch settings. It never changes. I have external pullups on all of the input pins. Any ideas?

Code:

#include "lcdboard.h"

void main() {
   PreLaunch();
   Configure_IO();

   Configure_Units();   // Read all switch setting, set defaults

   while(1){
      testIO();
   }
}

void PreLaunch(){
   setup_oscillator(OSC_31KHZ|OSC_INTRC);

   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF|ADC_TAD_MUL_0);

   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);

   setup_ccp1(CCP_OFF);
   setup_ccp2(CCP_OFF);

   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);

   setup_spi(SPI_SLAVE);

   setup_low_volt_detect(FALSE);
   setup_lcd(0b10001001,0b01110000);
}

void Configure_IO() {

   Set_TRIS_B(0x00);
   Set_TRIS_C(0x00);

}

void TestIO(){
   int value1 = 0;
   int value2 = 0;

   if (DIP1 == 0)
      value1+=1;
   if (DIP2 == 0)
      value1+=2;
   if (DIP3 == 0)
      value1+=4;
   if (DIP4 == 0)
      value1+=8;
   if (DIP5 == 0)
      value1+=16;
   if (DIP6 == 0)
      value1+=32;

   if (value1 > 29){
      lcd_symbol(Digit_Map[3],DIGIT5);
      lcd_symbol(Digit_Map[value1-30],DIGIT4);
   }
   else if (value1 > 19){
      lcd_symbol(Digit_Map[2],DIGIT5);
      lcd_symbol(Digit_Map[value1-20],DIGIT4);
   }
   else if (value1 > 9){
      lcd_symbol(Digit_Map[1],DIGIT5);
      lcd_symbol(Digit_Map[value1-10],DIGIT4);
   }
   else {
      lcd_symbol(Digit_Map[value1],DIGIT4);
   }

   if (SW1 == 0)
      lcd_symbol(Digit_Map[1],DIGIT8);
   if (SW2 == 0)
      lcd_symbol(Digit_Map[2],DIGIT8);
   if (SW3 == 0)
      lcd_symbol(Digit_Map[3],DIGIT5);
}



Heres part of the .h file

Code:

#include <18F8490.h>

#device adc=10

#FUSES NOWDT                    //Watch Dog Timer uses 1:32 Postscale
#FUSES INTRC_IO                 //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOBROWNOUT               //No brownout reset
#FUSES BORV28                   //Brownout reset at 2.8V
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOIESO                   //Internal External Switch Over mode disabled
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOFCMEN                  //Fail-safe clock monitor disabled
#FUSES NOMCLR                 //Master Clear pin enabled
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)

#use delay(clock=32000)

#define SW1 PIN_B7
#define SW2 PIN_B6
#define SW3 PIN_B5
#define DIP1 PIN_B0
#define DIP2 PIN_B1
#define DIP3 PIN_B2
#define DIP4 PIN_B3
#define DIP5 PIN_B4
#define DIP6 PIN_C2
newguy



Joined: 24 Jun 2004
Posts: 1903

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PostPosted: Tue Sep 20, 2005 1:52 pm     Reply with quote
You have the tris set wrong. 0 = output, 1 = input.
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Sep 20, 2005 1:59 pm     Reply with quote
PIN_B7 is #defined as a number
Code:
#define PIN_B7  31759

that means something to CCS specific functions.

In your code:
Code:

   if (DIP1 == 0)

would be
Code:

if (31759 == 0)


See the problem yet? You need to define DIP1 as portb.7 where you define portb as a variabe at the location of portb. Another option is to use the CCS function input(DIP1).

Also, if you handle the var yourself, remember to set the tris correctly (1 for an input). If you use standard_io and the CCS function, the Compiler will handle the tris for you.
Guest
PostPosted: Tue Sep 20, 2005 2:29 pm     Reply with quote
Thanks Guys, works now.
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