Trying to read Port B and Write to Port D

[Kamal]

I am using PIC16F877 for my project and I am simply trying to read 8-bit data from port B. I have a dip switch connected to the pins corresponding to Port B, which provides the 8bit data.

Then I assinged these 8bits to port D. I have eight LED's connected to the pins corresponding to Port D.

void main(void)
{
int value=0;
int value_ascii=0;
// init_mem();
delay_ms(1000);
while(1)
{
value = input_b();//is it correct to read port B this way?
value_ascii = (value-48);
printf("\%d ", value_ascii);
output_d(value); //is it correct to write to port D?
}
}


First of all, I am getting "Funtion not defined error" referring to my input_b(); line
Is there some header file or anything like such that i should be including in order for the complier to recognize input_b();
Is my methodology correct? any suggestions will be helpful
Thank you
kamal
___________________________
This message was ported from CCS's old forum
Original Post ID: 9457

[PCM programmer]

:=I am using PIC16F877 for my project and I am simply trying to read 8-bit data from port B. I have a dip switch connected to the pins corresponding to Port B, which provides the 8bit data.

I assume the Dip switches are connected to ground (or to
ground through a 1K resistor). Do you have pull-up resistors
on the Port B pins ? If not, you should enable the Port B
pullups with the CCS function "port_b_pullups(TRUE)".


:=Then I assinged these 8bits to port D. I have eight LED's connected to the pins corresponding to Port D.

Do you have resistors in series with each LED ?
You can use 220 ohms.

:=
:=void main(void)
:={
:= int value=0;
:= int value_ascii=0;
:=// init_mem();
:= delay_ms(1000);
:= while(1)
:= {
:= value = input_b();//is it correct to read port B this way?
:= value_ascii = (value-48);
In the line above, you're removing ASCII bias by subtracting
48 from the value (Assuming that "value" is in ASCII format).
So why do you call the result variable "value_ascii" ?
I would call it "value_binary" instead.

:= printf("\%d ", value_ascii);

:= output_d(value); //is it correct to write to port D?
:= }
:=}
:=
:=
:=First of all, I am getting "Funtion not defined error" referring to my input_b(); line

What version of the compiler do you have ? It compiles OK
with PCM vs. 3.110.

:=Is there some header file or anything like such that i should be including in order for the complier to recognize input_b();
:=Is my methodology correct? any suggestions will be helpful
:=Thank you
:=kamal
___________________________
This message was ported from CCS's old forum
Original Post ID: 9458