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What did I do wrong with this C code?

 
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slekhakul
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What did I do wrong with this C code?
PostPosted: Sun Feb 02, 2003 4:47 pm     Reply with quote

I am trying to write a C code for simple I/O by making port b as input and port d as output using set_tris_x function.

#include <16f877.h>
#fuses xt, nowdt
#byte b_port = 6
#byte d_port = 8

void main (void)
{
int i;
set_tris_b(0xff); // port b is input
set_tris_d(0x00); // port d is output
do {
i = b_port; // read port b
d_port = i; // write to port d
}while(true);
}

It did not work. I looked at the list file and found out that the C statement set_tris_d(0x00) instead to write 00 to trisd (SFR 8), it write 00 to trisc (SFR 7). What did I do wrong?
The list file is at follows:

CCS PCW C Compiler, Version 3.050, 12819

Filename: c:\documents and settings\slekhakul\my documents\ee 422\pic lab\lab1a.LST

ROM used: 26 (0\%)
Largest free fragment is 2048
RAM used: 7 (4\%) at main() level
7 (4\%) worst case
Stack: 0 locations

*
0000: MOVLW 00
0001: MOVWF 0A
0002: GOTO 004
0003: NOP
.................... #include <16f877.h>
.................... //////// Standard Header file for the PIC16F877 device ////////////////
.................... #device PIC16F877
.................... #list
....................
.................... #fuses xt, nowdt
.................... #byte b_port = 6
.................... #byte d_port = 8
....................
.................... void main (void)
.................... {
.................... int i;
0004: CLRF 04
0005: MOVLW 1F
0006: ANDWF 03,F
0007: MOVLW 9F
0008: MOVWF 04
0009: MOVLW 07
000A: MOVWF 00
000B: MOVLW FF
000C: MOVWF 20
.................... set_tris_b(0xff); // port b is input
000D: MOVLW FF
000E: BSF 03.5
000F: MOVWF 06
.................... set_tris_d(0x00); // port d is output
0010: MOVLW 00 <===============
0011: MOVWF 07 <=============== 07 is TRISC!
0012: BCF 03.5
0013: MOVWF 20
.................... do {
.................... i = b_port; // read port b
0014: MOVF 06,W
0015: MOVWF 21
.................... d_port = i; // write to port d
0016: MOVF 21,W
0017: MOVWF 08
.................... }while(true);
0018: GOTO 014
.................... }
....................
0019: SLEEP
___________________________
This message was ported from CCS's old forum
Original Post ID: 11213
PCM programmer



Joined: 06 Sep 2003
Posts: 20271

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Re: What did I do wrong with this C code?
PostPosted: Sun Feb 02, 2003 7:10 pm     Reply with quote

:=I am trying to write a C code for simple I/O by making port b as input and port d as output using set_tris_x function.
:=
:=It did not work. I looked at the list file and found out that the C statement set_tris_d(0x00) instead to write 00 to trisd (SFR 8), it write 00 to trisc (SFR 7). What did I do wrong?
:=The list file is at follows:
:=
:=CCS PCW C Compiler, Version 3.050, 12819
:=
:= Filename: c:\documents and settings\slekhakul\my documents\ee 422\pic lab\lab1a.LST
:=.................... set_tris_b(0xff); // port b is input
:=000D: MOVLW FF
:=000E: BSF 03.5
:=000F: MOVWF 06
:=.................... set_tris_d(0x00); // port d is output
:=0010: MOVLW 00 <===============
:=0011: MOVWF 07 <=============== 07 is TRISC!
:=0012: BCF 03.5
:=0013: MOVWF 20

------------------------------------------------------------
Here is a line from a previous CCS versions page:
3.052 SET_TRIS_D and E were broke in 3.050, 3.051 now restored

You can fix this by defining a macro for your
own "set_tris_d" function. See the example below:


#include "c:\progra~1\Picc\Devices\16F877.h"
#use delay(clock=8000000)
#fuses HS ,NOWDT, PUT, BROWNOUT, NOLVP
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#byte TRIS_D_REG = 0x88

#define my_set_tris_d(value) TRIS_D_REG = value


//===================================================
main ()
{

//set_tris_d(0x55);

my_set_tris_d(0x55);

while(1);
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 11215
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