hardware usart problem with pic 16f688

[fbinotti]

I can't use the hardware uart, with the FORCE_SW parameter the communication is good.

My pcwh version is: 4.062



#include <16F688.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES MCLR //Master Clear pin enabled
#FUSES NOCPD //No EE protection
#FUSES PUT //Power Up Timer
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled

#use delay(internal=4M)


//WORK.....
#use rs232(baud=2400,parity=N,xmit=PIN_C4,rcv=PIN_C5,bits=8,stream=PC,FORCE_SW)


//DON'T WORK
//#use rs232(baud=2400,parity=N,xmit=PIN_C4,rcv=PIN_C5,bits=8,stream=PC) //HARDWARE UART

void main()
{

setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC);
setup_vref(FALSE);

delay_ms(1000);
while(true)
{
fprintf(PC,"Test 232\n\r");
delay_ms(1000);
}
}
_________________
-----------------
Fabrizio Binotti

[Guest]

were you able to get the HW uart working? If not, post a reply and I can send you code I have used on the 16f688 using the HW uart.

[guest1]

Maybe you need to set the TX pin as an output. It's possible that the software UART code does this for you. Using the hardware you have to do it yourself.

[fbinotti]

The problem was solved in
CCS PCM C Compiler, Version 4.076, 41428

Thank you.
_________________
-----------------
Fabrizio Binotti