Same program but different results why !?!??!!?

[Garath]

Hie, i wrote 2 programs which have exactly the same code but when compiled, the 1st program works fine but the 2nd program doesn't work. Could someone please tell me why.
When a low is applied to RB0 the program is supposed to transmit 'c' to the computer.

//This is the code that works//
#include<c:\16f84.h>
#use delay(clock=4000000)
#use fast_io(A)
#use fast_io(B)
#byte _portA = 5
#byte _portB = 6
#use rs232 (baud=9600,xmit=pin_a1,rcv=Pin_a2, parity=N, bits=8, restart_wdt)

int main(void);
void reset(void); //ch//

int main()
{
//int i;
reset();
return;
}
//set_tris_b(0xff);
//set_tris_a(0x00);

void reset()
{
int i;
reloop: set_tris_a(0x00); //set all portB as output//
_portB = 0x01;
delay_us(10); //change//
bit_clear(_portB,0); //low reset pulse for minimum of 480us//
delay_us(500);
bit_set(_portb,0); //VPullup//
delay_us(100);

//receive mode//
i = bit_test(_portB,0);
if (!i)
{
delay_us(500);

printf(" C ");
delay_us(400);
}
else
delay_us(500);
goto reloop;


return;
}


//This doesn't work//

#include<c:\16f84.h>
#use delay(clock=4000000)
#use fast_io(A)
#use fast_io(B)
#byte _portA = 5
#byte _portB = 6
#use rs232 (baud=9600,xmit=pin_a1, rcv=Pin_a2, parity=N, bits=8, restart_wdt)

int main(void);
void reset(void);

int main()
{

reset();


return;
}

void reset()
{ //reset pulse//

int i;

reloop: set_tris_B(0x00); //set all portB as output//
_portB = 0x01;
delay_us(10);
bit_clear(_portB,0); //low reset pulse for minimum of 480us//
delay_us(500);
bit_set(_portb,0); //VPullup//
delay_us(100);

//receive mode//
i = bit_test(_portB,0);
if (!i)
{
printf(" c ");
delay_us(400);
}
else
delay_us(500);
goto reloop;


return;
}

Thanks
___________________________
This message was ported from CCS's old forum
Original Post ID: 2761

[Todd C. Micallef]

Hi, I hate to state the obvious but your first program has a set_tris_A

and the second has a set_tris_B

:=Hie, i wrote 2 programs which have exactly the same code but when compiled, the 1st program works fine but the 2nd program doesn't work. Could someone please tell me why.
:=When a low is applied to RB0 the program is supposed to transmit 'c' to the computer.
:=
:=//This is the code that works//
:=#include<c:\16f84.h>
:=#use delay(clock=4000000)
:=#use fast_io(A)
:=#use fast_io(B)
:=#byte _portA = 5
:=#byte _portB = 6
:=#use rs232 (baud=9600,xmit=pin_a1,rcv=Pin_a2, parity=N, bits=8, restart_wdt)
:=
:=int main(void);
:=void reset(void); //ch//
:=
:=int main()
:={
:=//int i;
:=reset();
:=return;
:=}
:=//set_tris_b(0xff);
:=//set_tris_a(0x00);
:=
:=void reset()
:={
:=int i;
:=reloop: set_tris_a(0x00); //set all portB as output//
:= _portB = 0x01;
:= delay_us(10); //change//
:= bit_clear(_portB,0); //low reset pulse for minimum of 480us//
:= delay_us(500);
:= bit_set(_portb,0); //VPullup//
:= delay_us(100);
:=
:= //receive mode//
:= i = bit_test(_portB,0);
:= if (!i)
:= {
:= delay_us(500);
:=
:= printf(" C ");
:= delay_us(400);
:= }
:= else
:= delay_us(500);
:= goto reloop;
:=
:=
:= return;
:=}
:=
:=
:=//This doesn't work//
:=
:=#include<c:\16f84.h>
:=#use delay(clock=4000000)
:=#use fast_io(A)
:=#use fast_io(B)
:=#byte _portA = 5
:=#byte _portB = 6
:=#use rs232 (baud=9600,xmit=pin_a1, rcv=Pin_a2, parity=N, bits=8, restart_wdt)
:=
:=int main(void);
:=void reset(void);
:=
:=int main()
:={
:=
:=reset();
:=
:=
:=return;
:=}
:=
:=void reset()
:={ //reset pulse//
:=
:=int i;
:=
:=reloop: set_tris_B(0x00); //set all portB as output//
:= _portB = 0x01;
:= delay_us(10);
:= bit_clear(_portB,0); //low reset pulse for minimum of 480us//
:= delay_us(500);
:= bit_set(_portb,0); //VPullup//
:= delay_us(100);
:=
:= //receive mode//
:= i = bit_test(_portB,0);
:= if (!i)
:= {
:= printf(" c ");
:= delay_us(400);
:= }
:= else
:= delay_us(500);
:= goto reloop;
:=
:=
:= return;
:=}
:=
:=Thanks
___________________________
This message was ported from CCS's old forum
Original Post ID: 2762