Please any help! PIC serial interface

[dbsjro]

pic to pic serial

Hello everyone.

I manage to send, lets say for example the character "N" (or enything i don't care) from PC but i can't make my microcontroller (pic16f628) do anything.

It just can't compare the character "N" with something in the code
in case i sent "something else" do nothin
in case i sent "N" do what i want

Thnx in advance

 

[dbsjro]

pic serial interface

Nobody has ever used getc(); or USART from a PIC?

 

[GSM Man]

pic serial interfacing

I think that no one understands what your problem is. It would help if you posted some code to show what you are doing, and people can comment on what is wrong,

 

[dbsjro]

getc pic

Yes you are probable right
i wanna read a string and when it is the desired one to do something

#include <16F628.h>
#fuses INTRC_IO, NOLVP, NOWDT, PUT, BROWNOUT
#use delay(clock=4000000)
#byte PORTB = 0x06
#byte PORTA = 0x05
#use fast_io(A)
#use fast_io(B)
#USE RS232(BAUD=9600, XMIT=PIN_B2, RCV=PIN_B1, uart1, parity=n, bits=8, stop=1,)

void main(void) {
char a=0;
set_tris_b(0b00000110);
set_tris_a(0x11);

   while(true) {
   
   a=getc();


   if ( 'a' == a) {
   output_high (pin_b6);
   output_low (pin_b7);}
   else {
   output_high (pin_b7);
   output_low (pin_b6);}

}}

Hope you understand what i m trying to do

 

[seadolphine2000]

pic seri yazıcı

if ( 'a' == a)

I think you are reversing the syntax. It should be:

 if(a=='a')

Also, take care that 'a' is different from 'A'.
I mean comparison in "if-statement" is case-sensitive.

I hope this helps.

 

[LECS]

troubleshoot serial interface

I think you are reversing the syntax. It should be:

 if(a=='a')

Not really. It is more usual to write

 if(a=='a')

but the result is the same if you write it the other way around. Also note that writing

if('a'==a)

guards against a common bug. If you accidentally write a single equals sign instead of 2 signs togethr, ie

 if(a='a')

then you get code that doesn't do what you want but is valid, and the error can be hard to spot. Make the same mistake with the order reversed, ie

 if('a'=a)

and it won't compile. So the syntax dbsjro uses highlights your error immediately and is thus safer.

Also, take care that 'a' is different from 'A'.

True. Good practise is to convert both sides to upper case before making the comparison.

 

[siongboon]

I think you might not have initialise your USART.

You might like to read more about RS232
www.siongboon.com/projects/2006-03-06_serial_communication
in order to understand and setup a simple test
step by step to troubleshoot the source of the problem.

Best Regards,
Siong Boon

 

[vinunandakumar]

Re: pic to pic serial

tryy this one www.twitter.com/VEATechs.Follow them for any ideas . It really works!!!

Hello everyone.

I manage to send, lets say for example the character "N" (or enything i don't care) from PC but i can't make my microcontroller (pic16f628) do anything.

It just can't compare the character "N" with something in the code
in case i sent "something else" do nothin
in case i sent "N" do what i want

Thnx in advance