PORTB direction problem!!

[johnq]

I have a silly problem with CCS picc compiler. When I send to the port b, 0xFF, portb bit 4 doesnt turn to logical 1. Would you help me please..My sample code is below.

Note: Eight LEDs are connected portb. All of LEDs are lighted except bit4 later the code below.

#if defined(__PCM__)
#include <16f877.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=16000000)
#use standard_io(B)
#endif

void main(void)
{

output_b(0xFF);

while(1);

}
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This message was ported from CCS's old forum
Original Post ID: 144516126

[Kenny]

:=I have a silly problem with CCS picc compiler. When I send to the port b, 0xFF, portb bit 4 doesnt turn to logical 1. Would you help me please..My sample code is below.
:=
:=Note: Eight LEDs are connected portb. All of LEDs are lighted except bit4 later the code below.
:=
:=#if defined(__PCM__)
:=#include <16f877.h>
:=#fuses HS,NOWDT,NOPROTECT
:=#use delay(clock=16000000)
:=#use standard_io(B)
:=#endif
:=
:=void main(void)
:={
:=
:=output_b(0xFF);
:=
:=while(1);
:=
:=}
:=
:=
:=
Perhaps you mean the 4th led, bit 3?
If so, change line to
#fuses HS,NOWDT,NOPROTECT,NOLVP

Regards
Kenny
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This message was ported from CCS's old forum
Original Post ID: 144516129

[Neutone]

<font face="Courier New" size=-1>:=I have a silly problem with CCS picc compiler. When I send to the port b, 0xFF, portb bit 4 doesnt turn to logical 1. Would you help me please..My sample code is below.
:=
:=Note: Eight LEDs are connected portb. All of LEDs are lighted except bit4 later the code below.
:=
:=#if defined(__PCM__)
:=#include <16f877.h>
:=#fuses HS,NOWDT,NOPROTECT
:=#use delay(clock=16000000)
:=#use standard_io(B)
:=#endif
:=
:=void main(void)
:={
:=
:=output_b(0xFF);
:=
:=while(1);
:=
:=}
:=
:=
:=

That pin is not able to output high. Only float and output low. Try wiring the LED's to +5 instead of ground. Then you pull the pins low to turn them on.</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516149

[Kenny]

:=I have a silly problem with CCS picc compiler. When I send to the port b, 0xFF, portb bit 4 doesnt turn to logical 1. Would you help me please..My sample code is below.
:=
:=Note: Eight LEDs are connected portb. All of LEDs are lighted except bit4 later the code below.
:=
:=#if defined(__PCM__)
:=#include <16f877.h>
:=#fuses HS,NOWDT,NOPROTECT
:=#use delay(clock=16000000)
:=#use standard_io(B)
:=#endif
:=
:=void main(void)
:={
:=
:=output_b(0xFF);
:=
:=while(1);
:=
:=}
:=
:=
:=

Did you mean port a? Bit 4 of port a is the one that needs the pullup.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516186

[johnq]

:=:=I have a silly problem with CCS picc compiler. When I send to the port b, 0xFF, portb bit 4 doesnt turn to logical 1. Would you help me please..My sample code is below.
:=:=
:=:=Note: Eight LEDs are connected portb. All of LEDs are lighted except bit4 later the code below.
:=:=
:=:=#if defined(__PCM__)
:=:=#include <16f877.h>
:=:=#fuses HS,NOWDT,NOPROTECT
:=:=#use delay(clock=16000000)
:=:=#use standard_io(B)
:=:=#endif
:=:=
:=:=void main(void)
:=:={
:=:=
:=:=output_b(0xFF);
:=:=
:=:=while(1);
:=:=
:=:=}
:=:=
:=:=
:=:=
:=
:=Did you mean port a? Bit 4 of port a is the one that needs the pullup.

No I mean the PORTB and I solved my problem with your help. Thank you...See you..
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516215