Can't receive data from my computer with RS232

[YulL]

Hi, I have a strange problem with my program : I can't receive data when I press any button of my keyboard...

Here is my complete source :

#include "C:\...\TEST.h"
#include <stdio.h>
#include <lcd.c>
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,PARITY=N,BITS=8)

int16 demo;

void main()
{
int8 test;

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(FALSE);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
set_tris_a (0);
set_tris_c (0xBF); //RC7 Input & RC6 Output

output_low(LED0);
output_low(LED1);
demo=0;

lcd_init();
delay_ms( 20 );
printf(lcd_putc, "\fAIRLINK\n2080\n");
delay_ms( 3000 );
lcd_putc("\f");

printf("Continue (y,n)?");
do { test=getch(); }
while(test!='y');

printf("OK!");
delay_ms( 3000 );
lcd_putc("\f");

while(1)
{
printf(lcd_putc,"\f%ld s",demo);
demo++;
output_low(LED0);
output_low(LED1);
delay_ms( 1000 );
printf(lcd_putc,"\f%ld s",demo);
demo++;
output_low(LED0);
output_high(LED1);
delay_ms( 1000 );
printf(lcd_putc,"\f%ld s",demo);
demo++;
output_high(LED0);
output_low(LED1);
delay_ms( 1000 );
printf(lcd_putc,"\f%ld s",demo);
demo++;
output_high(LED0);
output_high(LED1);
delay_ms( 1000 );
}
}

and test.h :

#include <16F873.h>
#device adc=8
#use delay(clock=11059200)
#fuses HS, NOWDT, NOPROTECT, NOLVP, BROWNOUT, PUT
#define LED0 PIN_A0
#define LED1 PIN_A1

If you experienced that before, please tell me.
Thanks by advance for your precious help.

[asmallri]

[YulL]

Yes, my program send OK to the PC if I push the 'y' key...

[asmallri]

I don't understand what your problem is. The main loop of your code does not look for any input from the PC. Similarly it does not send anything to it.

[Guest]

It happens here :

[YulL]

Ok I've remade my program and replace with this :

printf("Press any key to begin.\n\r");
getc();

The problem is that even if I don't press any button, the program continues and ignore my key...

[asmallri]

Do you correctly receive the "Press any key to begin" message on the PC?

[YulL]

Yes I see that sentence on my screen but the programs keeps going and ignore my key...

Thanks for your reply

[Ttelmah]

[YulL]

Yes maybe it is a wiring error but I've checked this and I haven't found any error...

[dyeatman]

How is your connection to the PIC set up? Do you have a MAX232 or similar to invert the signal as it requires?

The PIC is expecting an inverted RS232 signal that would normally be present when an RS232 converter is in the circuit.

[YulL]

I'm using the MAX232CPE device for the conversion. I've checked the wiring according to the datasheet and samples taken from the web.

[YulL]

My RC7/RX Pin is always +2V when I don't touch my keyboard.. Is it normal??

[asmallri]

[YulL]

Hi, Thanks for your support.