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Strange pic16f886 usart problem

 
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lloureiro



Joined: 19 Sep 2012
Posts: 9

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Strange pic16f886 usart problem
PostPosted: Sun Apr 03, 2016 12:50 pm     Reply with quote
Hello, I'm using pic 16f886 to produce uart output. It looks good in uart terminal, but not good at rs232 terminal, i got strange chars.
Code:

#include <16f886.h>
#include "../h/spi.h"
#use delay(clock=8000000)
#include "../h/fuses.h" 
#use rs232(baud=1200, xmit=PIN_B6, rcv=PIN_B7)


 void init(){
   setup_oscillator(OSC_8MHZ);
   SET_TRIS_B(0x82);
   SET_TRIS_C(0x10);
}

 
void main (){
    init();
   printf( "2teste...\r\n");
   for(;;){
     printf( "2teste...\r\n");
     
   delay_ms(1000);
   }
}

and fuses


#FUSES NODEBUG
#FUSES NOLVP
#FUSES NOFCMEN
#FUSES NOIESO
#FUSES NOBROWNOUT
#FUSES NOPROTECT
#FUSES NOCPD
#FUSES MCLR
#FUSES NOPUT
#FUSES NOWDT
#FUSES INTRC_IO

Can anyone help me?

Thanks a lot
temtronic



Joined: 01 Jul 2010
Posts: 9177
Location: Greensville,Ontario

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PostPosted: Sun Apr 03, 2016 1:22 pm     Reply with quote
For Rs-232 you need to have a MAX232 or similar chip between PIC and the other RS232 device( PC ?)

Also you need to add 'errors' to the USERS232(...options...) so that the UART will not 'hang' when receiving data. I know you're only transmitting now...but ...eventually you'll want to get data.

Also use
#FUSES PUT //enable Power Up Timer

While this adds a very small delay it allows the PIC to Power Up in a neat,orderly fashion.

And.... usually there's no need to specifically use Set_tris...... as the compiler will handle the DDR as required.

Jay
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