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PB with gets() PICC port RS232

 
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aydi



Joined: 11 Aug 2010
Posts: 12

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PB with gets() PICC port RS232
PostPosted: Wed Aug 11, 2010 1:34 am     Reply with quote
Good morning,

I have a problem to use the port RS232 with pic.
I use ISIS to simulate my board and PICC compiler to develop my program. I just begin by reading the frame using RX, TX of the pic 18F2550.

This code is compiled but the simulation didn't work, means it just show me Password.

Could you please help me.

Thanks in advance.

Here below is the program:
Code:

#include <18F2550.h>
#include<stdio.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20M)
#use rs232(uart1,baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

void main()
{
   char string[30],password[30]="azerty";
   
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_spi(SPI_SS_DISABLED);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
//Setup_Oscillator parameter not selected from Intr Oscillator Config tab

   // TODO: USER CODE!!
  //set_tris_B(0xff); 
 

while(1)
{
printf("Password: ");

gets(string);

if(strcmp(string, password))
   printf("OK");
else printf("NO");

}
 

}

Smile
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 11, 2010 1:46 pm     Reply with quote
Quote:
void main()
{
char string[30],password[30]="azerty";

setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_spi(SPI_SS_DISABLED);
setup_wdt(WDT_OFF);

The line in bold is wrong. It does not in fact disable the SPI. It enables
it, but it does so without the Slave Select option. This means the SDO
pin is set as an output. But that pin is used for the UART Rx on this PIC.
Therefore it's not going to work. Change the setup_spi() to use FALSE
as the parameter. Or better yet, just get rid of that line. It's not even needed.
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