about 74LS165 CONNECTION QUESTION.

whung.john · Guest

HI!
have body can solve my question! and teach me .
Today,I want to pratice a ccs program include demo progra.
The program is about 75LS165 protice.
but i had readed .but i dont ready understand describe contents.
the program have describe fllows as;

THE DESCRIBE 1 -->> EXP_IN_ENABLE PIN_B3
THE DESCRIBE 2 -->> EXP_IN_CLOCK PIN_B4
THE DESCRIBE 3 -->> EXP_IN_DI PIN_B5
but i dont understand to connection pin address.
should it connected to my chip(pin16c877 & 74ls165)
I find the 74ls165 datasheets.the datasheets have report pin address.
but i dont understand (shift/load pin) address must connected to where ,how can i learn to connected pic16f877 pin address . is demo program pin_b3 or pinB4 or pin_b5?
the same question .chip 74ls165 (clock)pin address is pin_b3 or pinB4 or pin_b5?
next question. chip 74ls165 (output)pin address is pin_b3 or pinB4 or pin_b5?

i protrice demo program follow as :
*************************************************************
///////////////////////////////////////////////////////////////////////////
//// Library for a 74165 Expanded Input Chip ////
//// ////
//// Any number of these chips may be connected in series to get ////
//// 8 additional inputs per chip. The cost is 3 I/O pins for ////
//// any number of chips. ////
//// ////
//// read_expanded_inputs(ei); Reads the array ei from the chips ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////

#IFNDEF EXP_IN_ENABLE

#define EXP_IN_ENABLE PIN_B3
#define EXP_IN_CLOCK PIN_B4
#define EXP_IN_DI PIN_B5
#define NUMBER_OF_74165 1

#ENDIF

void read_expanded_inputs(BYTE *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) { // Clock in bits to the ei structure
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);
}

*********************************************************

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

I have added an explanation of the connections between the PIC pins
and the 74165 pins in the comments below:

whung.john · Guest

pcm programmer:
i readed u added an explanation .but i try finish still have question .
please see my edit my test program.because i find .lcd panel
still display inbox=72,and count value is right.
i read u explanation.and connected .
#define EXP_IN_ENABLE PIN_B3 // Connect to SH/LD pin
#define EXP_IN_CLOCK PIN_B4 // Connect to CLK pin
#define EXP_IN_DI PIN_B5 // Connect to SER pin

my program dont doing right,and get a button pull information.
still display display inbox=72,and count value is right.
so,i find ccs demo program
i find different with u explanation. can u tell me who is right?
follow as:
////////////////////////////////////////////////////////////////////////
//// EX_EXPIO.C ////
//// ////
//// This program shows how to use the 74165.C and 74595.C ////
//// libraries for extended input and output. ////
//// ////
//// When button 1 is pushed, LED 1 will toggle green. Button ////
//// 2 will toggle LED 2. However, when both buttons are pushed, ////
//// LED 3 will toggle green. ////
//// ////
//// Configure the CCS prototype card as follows: ////
//// 74165 pin Protoboard ////
//// 11 40 Button 1 ////
//// 12 41 Button 2 ////
//// 13 27 gnd ////
//// 14 27 gnd ////
//// 15 27 gnd ////
//// 3 27 gnd ////
//// 4 27 gnd ////
//// 5 27 gnd ////
//// 6 27 gnd ////
//// 8 27 gnd ////
//// 16 28 +5V ////
//// 9 52 B5 ////
//// 1 50 B3 ////
//// 2 51 B4 ////

send my program.
follow as
#include <16F877.h>
#use delay(clock=10000000)
#fuses NOWDT,HS
#include <LCD>
#include <74165.c>
void main()
{
int i;
BYTE da;
lcd_init();
while(1)
{
for (i=1;i<100;i++)
{
lcd_gotoxy(1,1);printf(lcd_putc,"inbox=%4u",read_expanded_inputs(da));
lcd_gotoxy(1,2);printf(lcd_putc,"count=%d",i);
delay_ms(100);
}
i=0;
}

}

can u help me again?please thanks.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Add the fuse settings shown below in bold:

whung.john · Guest

hi PCM programmer:
i readed u suggest contents.
in my target lcd panel ,ready touch button 1~8.i can
get right .display value 254,253,251......
but i still have a idea. if my thinks use spi function,
how can i connected to 74165 chip pin address.
can u teach me pin address.and how connected to pic16f877.
thanks u .

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

The CCS driver is now working for you.

But you want me to write you a new version of the driver,
that uses hardware SPI instead of "bit banging".

I think you should write the new driver.

Read the articles in the forum on how to write an SPI driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=28767