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f877 port D input problem

 
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minemind



Joined: 11 Apr 2005
Posts: 3

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f877 port D input problem
PostPosted: Mon Apr 11, 2005 9:09 pm     Reply with quote
Hi,
I'm having problem reading from port d. Port d use 10k pullups resistor and port a have led on each pins.
Am i missing something? I cannot read from port d. i'm using ccs ver2.686.
please help me since i've been working around for about quite some time. Below are some of the code.

#fuses HS, NOWDT, PUT, NOBROWNOUT, NOLVP, NOPROTECT
#USE FAST_IO(D)
#USE FAST_IO(E)
#byte portd=8
#byte porte=9

void main() {

char dBuff;

// i disable all interrupts
// and then. . .
disable_interrupts(GLOBAL);

port_b_pullups(FALSE); // disable pullups
setup_adc_ports(NO_ANALOGS); // disable analogs.
setup_psp(PSP_DISABLED); // disable psp

set_tris_d(0xff);

while (1) {
porta=portd; // send to porta, and this not working
dBuff=portd;
printf("%c", dBuff);
}
}
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minemind
Sugiman



Joined: 12 Jan 2005
Posts: 15

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PostPosted: Tue Apr 12, 2005 2:29 am     Reply with quote
Quote:
set_tris_d(0xff);


Did you also set up port A for output somewhere in your code?
treitmey



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

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try this
PostPosted: Tue Apr 12, 2005 8:01 am     Reply with quote
Code:
#include <16F877.h>
#device *=16
#use delay(clock=4000000)
#fuses HS,NOWDT,NOLVP,PROTECT,PUT,BROWNOUT
#use rs232(baud=9600,xmit=PIN_C4,INVERT,stream=DEBUG) // STDERR(same as DEBUG)
#use rs232(baud=1200,errors,xmit=PIN_C6,rcv=PIN_C7,parity=e,enable=PIN_C5,bits=8,stream=CIM)
#case
#zero_ram
#define VER_MAJOR 1
#define VER_MINOR 01

#use fast_io(D)
#byte relays=8 //16F877 port D is at 8

#USE FAST_IO(A)
#USE FAST_IO(B)
#USE FAST_IO(C)
#USE FAST_IO(D)
#USE FAST_IO(E)
#byte porta=5
#byte portb=6
#byte portc=7
#byte portd=8
#byte porte=9

void main() {

  char dBuff;
  disable_interrupts(GLOBAL);
  port_b_pullups(FALSE); // disable pullups
  setup_adc_ports(NO_ANALOGS); // disable analogs.
  setup_psp(PSP_DISABLED); // disable psp
  set_tris_d(0xff);
  set_tris_a(0x00);

  while (1) {
    porta=portd; // send to porta, and this not working
    dBuff=portd;
    printf("%c", dBuff);
  }
}
minemind



Joined: 11 Apr 2005
Posts: 3

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Thanks
PostPosted: Tue Apr 12, 2005 7:29 pm     Reply with quote
You all help me a lot.
TQ.

Emi
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minemind
minemind



Joined: 11 Apr 2005
Posts: 3

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Thanks
PostPosted: Tue Apr 12, 2005 7:29 pm     Reply with quote
You all help me a lot.
TQ.

Emi
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minemind
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