Help with Rs232 and putc

[jptalledo]

Hi everyone

I have trouble with this code, I received in my pc the data 0xFF 0x80 0xFF but I send 0xFF 0x00 0xFF .what is wrong. I use ccs 3.2 compiler


#include "C:\servo1.h"
#include <stdio.h>
#include <string.h>


void main()
{

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
while(1)
{
delay_ms(500);

putc(0xFF);
delay_us(10);
putc(0x00);
delay_us(10);
putc(0xFF);




}
}

[PCM programmer]

You need to post the first part of your program, such as
the #include statement for your .H file, and #fuses,
#use delay(), and #use rs232(), etc.
Also post the PIC that you are using and the FULL version number.
(ie., not "3.2", but 3.207, or 3.212, etc.)

[SherpaDoug]

It looks like some sort of framing error. It could be inaccurate clocks giving inaccurate baud rates.
_________________
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[jptalledo]

#include <16F876A.h>
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,HS, PUT, NOPROTECT, NODEBUG, NOBROWNOUT, NOLVP, NOCPD, NOWRT
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)




#include "C:\servo1.h"
#include <stdio.h>
#include <string.h>


void main()
{

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
while(1)
{
delay_ms(500);

putc(0xFF);
delay_us(10);
putc(0x00);
delay_us(10);
putc(0xFF);

// delay_ms(500);

// putc(0xFF);
// putc(0x00);
// putc(0x00);


}
}


my compiler version is 3.203

[asmallri]

Are you using a Max232 chip? If so check the +V and -V voltage generated on the chip. They should be about +9.5v and -9.5v respectively. If not look for a capacitor installed incorrectly or a poor solder joint. This is a very common source of problems.

How are you powering the target? How is the ground connection commoned between the two systems?