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#INT_RDA on PIC18F2620

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Corta

Joined: 25 Jan 2007
Posts: 5

#INT_RDA on PIC18F2620

Posted: Tue Feb 13, 2007 3:01 pm

I use wireless module to communicate with a pc, it use RS232. My electronic is perfect but i have a problem with my program. I use rda_isr() but i cannot read the receive buffer.

Code:

#include <18F2620.h>
#device adc=8
#fuses NOWDT,WDT128,HS, NOPROTECT, NOIESO, BROWNOUT, BORV21, NOPUT, NOCPD, NOSTVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOEBTR, NOCPB, NOEBTRB, NOWRTC, NOWRTB, NOFCMEN, NOXINST, NOPBADEN, LPT1OSC, MCLR
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)

#include "C:\MAX\Marche\marche.h"
#include "C:\MAX\Marche\moteur.c"

int Positions[10][6] = {
{1500,1500,1500,1500,1500,1500},
{1500,1500,1400,1500,1500,1400},
{1625,1600,1400,1600,1600,1400},
{1625,1600,1500,1600,1600,1500},
{1625,1600,1600,1600,1600,1600},
{1500,1500,1600,1500,1500,1600},
{1400,1400,1600,1400,1400,1600},
{1400,1400,1500,1400,1400,1500},
{1400,1400,1400,1400,1400,1400},
};

#int_RDA
RDA_isr()
{
int iCommande = -1;
int i,j,k;

iCommande = getc();
if(iCommande == 0x55)
{
...
}
}

void main()
{
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_spi(FALSE);
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);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);

output_bit(PIN_C4, 1);
output_bit(PIN_C5, 0);

while(1)
{
...
}
}

If i transmit 0x55 it receive it but if i try just if(iCommande) it works with anything i transmit.

thanks
Max

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Feb 13, 2007 5:30 pm

Quote:

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)

Why did you specify 9 data bits ? The normal number is 8 data bits.

I suggest that you use this statement instead:

Code:

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

----------------------

Quote:

int Positions[10][6] = {
{1500,1500,1500,1500,1500,1500},
{1500,1500,1400,1500,1500,1400},

In CCS, an 'int' is an unsigned 8-bit integer. So your array declaration
above will not work. You want to store 16-bit values in the array,
so you should declare it as a 'int16' array. Example:

Quote:

int16 Positions[10][6] = {
1500,1500,1500,1500,1500,1500},
{1500,1500,1400,1500,1500,1400},

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