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uart reception issue on PIC16LF88

 
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backb0ne86



Joined: 28 Apr 2013
Posts: 2

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uart reception issue on PIC16LF88
PostPosted: Sun Apr 28, 2013 10:09 am     Reply with quote
Hello Guys,

I m having trouble using the PIC16LF88.
Sending is working perfectly fine.
Reception is working only using SW UART (let me think that my board is good). However i want to use the HW uart to use the RDA interrupt.

Reception does not work (kbhit or interrupt).

My compiler is version 4.068.

I have read many think about UART problem, but i did not find the good tips to fix my problem.
Thanks in advance for your help Smile

Here is my code:
Code:

#include <16F88.h>
#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES INTRC_IO
#FUSES NOBROWNOUT
#use delay(clock=8000000)
#use standard_io(A)

#use rs232(baud=1200, xmit=PIN_B5, rcv=PIN_B2, STREAM=XBEE, ERRORS)//, FORCE_SW)//, DISABLE_INTS)

char receivedChar;
char receivedCharOld;
#INT_RDA
void rda_isr()
{
 receivedChar =fgetc(XBEE);
 fputc(receivedChar,XBEE);
}

void main()
{
   int test;
   int c;
   char RCSTAValude;
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_timer_2(T2_DIV_BY_1,0,1);

   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   setup_oscillator(OSC_8MHZ|OSC_TIMER1);

   setup_counters(RTCC_INTERNAL,RTCC_8_BIT|RTCC_DIV_256); // 50hz with preload

   set_tris_a(0b00000000);
   set_tris_b(0b00000000);

   setup_timer_2(T2_DIV_BY_1, 125, 1);

   delay_ms(2000);
   test=0;
   fprintf(XBEE,"Ready");

   enable_interrupts(INT_TIMER2);
   enable_interrupts(INT_RDA);

   do
   {

void main()
{
   int test;
   int c;
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_timer_2(T2_DIV_BY_1,0,1);

   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   setup_oscillator(OSC_8MHZ|OSC_TIMER1);

   setup_counters(RTCC_INTERNAL,RTCC_8_BIT|RTCC_DIV_256); // 50hz with preload
   setup_vref(FALSE);
   set_tris_a(0b00000000);
   set_tris_b(0b00000000);
    setup_timer_2(T2_DIV_BY_1, 125, 1);


   delay_ms(2000);
   fprintf(XBEE,"Ready");
   //setup_uart(1200, XBEE);
   enable_interrupts(INT_TIMER2);
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);
   do
   {
      //if(kbhit(XBEE))
      //{
      //   receivedChar=fgetc(XBEE);
      if(receivedChar!=receivedCharOld)
      {
         receivedCharOld=receivedChar;
//********
//Processing
//********
      }
   }while(1);
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19436

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PostPosted: Sun Apr 28, 2013 1:40 pm     Reply with quote
Start by posting a small compilable program.
What you have posted is half each of two separate programs, and hasn't got a hope of compiling, let alone working.
dyeatman



Joined: 06 Sep 2003
Posts: 1931
Location: Norman, OK

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PostPosted: Sun Apr 28, 2013 2:53 pm     Reply with quote
Also, You are using Standard I/O so you don't need to set TRIS.

The below two lines are setting all the pins to outputs.
Get rid of these lines..

Quote:
set_tris_a(0b00000000);
set_tris_b(0b00000000);


You also enabled Interrupts for Timer 2 with no interrupt handler defined.
Never enable interrupts without an Interrupt handler.
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Apr 28, 2013 9:56 pm     Reply with quote
Also your program has many unnecessary lines which turn off modules
which are already off when the PIC is reset. Normally adding all these
extra lines doesn't cause a problem, but in this case it does:
Quote:

char RCSTAValude;
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_spi(FALSE);
setup_timer_2(T2_DIV_BY_1,0,1);

See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=29830
backb0ne86



Joined: 28 Apr 2013
Posts: 2

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PostPosted: Thu May 02, 2013 9:30 am     Reply with quote
Thanks PCM programmer. You are a genius!
I have also corrected my set_tris_b line which was wrong too.

Thanks again all for your usefull replies!
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