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74165 IC Problem Help Me

 
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ekocakaya



Joined: 13 Aug 2006
Posts: 12

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74165 IC Problem Help Me
PostPosted: Sun Aug 27, 2006 11:51 pm     Reply with quote
My problem is the circuit is ok but I cant read 32 bit value.In my circuit there is 32 button.system is giving +5V to 74165 input pins .When you push the button low the its pin then system will flash led as the number of pin . The system is now working ramdomly when I push button 2 its is flashing 2 times than I push button 3 it is again flashing 2 times.Where is problem can you help me?

Code:


#include <18F4620.h>
#fuses NOWDT,INTRC_IO, NOPUT, NOMCLR, BROWNOUT, NOCPD, NOWRT, NODEBUG, NOPROTECT, FCMEN, IESO,NOLVP
#define OSC_4MHZ | OSC_INTRC
#use delay(clock=4000000)


#define EXP_IN_ENABLE   PIN_C5
#define EXP_IN_CLOCK    PIN_C6
#define EXP_IN_DI       PIN_C7
#define NUMBER_OF_74165 4
#define high_start 15



byte seconds, high_count;
byte dakika=0,saat=0;
int32 ei;
void read_expanded_inputs(int32 *ei)

{

  BYTE i;
  output_high(EXP_IN_CLOCK);
  output_low(EXP_IN_ENABLE);      // Latch all inputs
  output_high(EXP_IN_ENABLE);

  for(i=1;i<=NUMBER_OF_74165*8;++i)
  {
    shift_left(ei,NUMBER_OF_74165,input(EXP_IN_DI));
    output_low(EXP_IN_CLOCK);
    output_high(EXP_IN_CLOCK);

  }
  output_low(EXP_IN_ENABLE);
}



void main()
{
byte value=0,a;
int i;



do
{
read_expanded_inputs(&ei);

for(i=0;i<=7;i++)
{
read_expanded_inputs(&ei);
delay_ms(500);
value = bit_test (ei,i);

if(value==0)
   {
   OUTPUT_HIGH(PIN_D4);
   for(a=0;a<i;a++)
   {
   OUTPUT_HIGH(PIN_B6);
   delay_ms(500);
   OUTPUT_LOW(PIN_B6);
   delay_ms(500);
   }
if(value==1)
OUTPUT_LOW(PIN_D4);

}
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Mon Aug 28, 2006 8:27 am     Reply with quote
Don't use your function. Use the standard read_expanded_inputs from
the 74165.c file in the drivers subdirectory. In your function you tell it
that the address is pointing to an int32. If you use yours, the address is
incr by 4 each time. But you really only wanted incr by 1.

Your int32 ie; is just fine. And you pass the address fine also.
Code:
#include <18F4620.h>
#fuses NOWDT,INTRC_IO, NOPUT, NOMCLR, BROWNOUT, NOCPD, NOWRT, NODEBUG, NOPROTECT, FCMEN, IESO,NOLVP
#define OSC_4MHZ | OSC_INTRC
#use delay(clock=4000000)
#define EXP_IN_ENABLE   PIN_C5
#define EXP_IN_CLOCK    PIN_C6
#define EXP_IN_DI       PIN_C7
#define NUMBER_OF_74165 4
#define high_start 15
#include <74165.c>

byte seconds, high_count;
byte dakika=0,saat=0;
int32 ei;

void main()
{
  byte value=0,a;
  int i;
  while(1){
    read_expanded_inputs(&ei);
    delay_ms(500);
    for(i=0;i<=7;i++){
      if(bit_test (ei,i)){
        OUTPUT_HIGH(PIN_D4);
        for(a=0;a<i;a++){
          OUTPUT_HIGH(PIN_B6);
          delay_ms(500);
          OUTPUT_LOW(PIN_B6);
          delay_ms(500);
        }

      }
      else{
        OUTPUT_LOW(PIN_D4);
      }
    }
  }
}


ekocakaya



Joined: 13 Aug 2006
Posts: 12

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PostPosted: Mon Aug 28, 2006 9:20 am     Reply with quote
Dear Sir,

If I want to read 32 bit one by one. what I must do? changing for(.. <32) is enough?
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Mon Aug 28, 2006 9:28 am     Reply with quote
I don't understand what you mean.
Quote:
32 bit one by one.

The #define NUMBER_OF_74165 4
tells the function your reading 4 bytes.. that is how it gets the int32.
You must serially read all 4 bytes.
Then check the status of bit.
ekocakaya



Joined: 13 Aug 2006
Posts: 12

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PostPosted: Mon Aug 28, 2006 10:44 am     Reply with quote
Dear Sir,

I want to read 32 bit and using four 74165.I have 32 button and each button is connected to 74165s .when ı change the code like below will it be correct?

Code:

void main()
{
  byte value=0,a;
  int i;
  while(1){
    read_expanded_inputs(&ei);
    delay_ms(500);
    for(i=0;i<=31;i++){
      if(bit_test (ei,i)){
        OUTPUT_HIGH(PIN_D4);
        for(a=0;a<i;a++){
          OUTPUT_HIGH(PIN_B6);
          delay_ms(500);
          OUTPUT_LOW(PIN_B6);
          delay_ms(500);
        }

      }
      else{
        OUTPUT_LOW(PIN_D4);
      }
    }
  }
}
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

View user's profile Send private message Visit poster's website

PostPosted: Mon Aug 28, 2006 1:07 pm     Reply with quote
Yes
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