RS232 problem on PIC16f73

[R Bhaskaran]

HI,
I am a newbie with CCS. I have a simple appln on PIC16F73 to communicate with a PC, using rs232(8N1 signal). Have a tested HW with MAX233 and 4MH crystal.
I used the project wizard of (PCW - 3.24) and have a simple code sending chars to the serial port, as follows...
/***********************************************************/
#include <16F73.h>
#use delay(clock=4000000)
#fuses XT,PUT,BROWNOUT,NOWDT
#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7)

static int fCount, fFlag;

main(){

while(1){
putc('G');
putc('\r');
/* this is buzzer for TESTINg the main loop */
fCount= (fCount+1)\%20;
if(fCount==0){
if(fFlag==0){
output_bit(PIN_A2,1);
fFlag =1;
}
else{
output_bit(PIN_A2,0);
fFlag = 0;
}
}

}
}
/***********************************************************/
The main loop is working as the buzzer is beeping. But the QBASIC program that try to read the chars sent by the PIC only shows an I/O ERROR !!

I tried
#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)
#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
also, but nothing seems to be working.

Can anybody help me to fix this?
Thanks,

R Bhaskar
___________________________
This message was ported from CCS's old forum
Original Post ID: 13126

[Sherpa Doug]

It sounds like a QBASIC problem. Can you try looking at the data comming into the PC with PROCOM, or SIOW that comes from CCS, or any other standard terminal program? Is there any way to get more info from QBASIC about what type of IO error? Can you look at the serial line with a scope and verify the serial bits out of the PIC?
SherpaDoug

:=HI,
:=I am a newbie with CCS. I have a simple appln on PIC16F73 to communicate with a PC, using rs232(8N1 signal). Have a tested HW with MAX233 and 4MH crystal.
:=I used the project wizard of (PCW - 3.24) and have a simple code sending chars to the serial port, as follows...
:=/***********************************************************/
:=#include <16F73.h>
:=#use delay(clock=4000000)
:=#fuses XT,PUT,BROWNOUT,NOWDT
:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7)
:=
:=static int fCount, fFlag;
:=
:=main(){
:=
:= while(1){
:= putc('G');
:= putc('\r');
:= /* this is buzzer for TESTINg the main loop */
:= fCount= (fCount+1)\%20;
:= if(fCount==0){
:= if(fFlag==0){
:= output_bit(PIN_A2,1);
:= fFlag =1;
:= }
:= else{
:= output_bit(PIN_A2,0);
:= fFlag = 0;
:= }
:= }
:=
:= }
:=}
:=/***********************************************************/
:=The main loop is working as the buzzer is beeping. But the QBASIC program that try to read the chars sent by the PIC only shows an I/O ERROR !!
:=
:=I tried
:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)
:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
:=also, but nothing seems to be working.
:=
:=Can anybody help me to fix this?
:=Thanks,
:=
:=R Bhaskar
___________________________
This message was ported from CCS's old forum
Original Post ID: 13136

[Jonko]

Try configuring the TRISC register...

I'm running a 16F876 @ 4 Mhz with a MAX232, computer serial port configured as 19200bps 8N1, and no problems.

Try with a terminal emulator program to test RS232 connection (i.e. HyperTerminal)

;)


:=It sounds like a QBASIC problem. Can you try looking at the data comming into the PC with PROCOM, or SIOW that comes from CCS, or any other standard terminal program? Is there any way to get more info from QBASIC about what type of IO error? Can you look at the serial line with a scope and verify the serial bits out of the PIC?
:=SherpaDoug
:=
:=:=HI,
:=:=I am a newbie with CCS. I have a simple appln on PIC16F73 to communicate with a PC, using rs232(8N1 signal). Have a tested HW with MAX233 and 4MH crystal.
:=:=I used the project wizard of (PCW - 3.24) and have a simple code sending chars to the serial port, as follows...
:=:=/***********************************************************/
:=:=#include <16F73.h>
:=:=#use delay(clock=4000000)
:=:=#fuses XT,PUT,BROWNOUT,NOWDT
:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7)
:=:=
:=:=static int fCount, fFlag;
:=:=
:=:=main(){
:=:=
:=:= while(1){
:=:= putc('G');
:=:= putc('\r');
:=:= /* this is buzzer for TESTINg the main loop */
:=:= fCount= (fCount+1)\%20;
:=:= if(fCount==0){
:=:= if(fFlag==0){
:=:= output_bit(PIN_A2,1);
:=:= fFlag =1;
:=:= }
:=:= else{
:=:= output_bit(PIN_A2,0);
:=:= fFlag = 0;
:=:= }
:=:= }
:=:=
:=:= }
:=:=}
:=:=/***********************************************************/
:=:=The main loop is working as the buzzer is beeping. But the QBASIC program that try to read the chars sent by the PIC only shows an I/O ERROR !!
:=:=
:=:=I tried
:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)
:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
:=:=also, but nothing seems to be working.
:=:=
:=:=Can anybody help me to fix this?
:=:=Thanks,
:=:=
:=:=R Bhaskar
___________________________
This message was ported from CCS's old forum
Original Post ID: 13156

[R Bhaskaran]

Thank You very much. I will try out and will come back if could not fix.
RB

:=Try configuring the TRISC register...
:=
:=I'm running a 16F876 @ 4 Mhz with a MAX232, computer serial port configured as 19200bps 8N1, and no problems.
:=
:=Try with a terminal emulator program to test RS232 connection (i.e. HyperTerminal)
:=
:=;)
:=
:=
:=:=It sounds like a QBASIC problem. Can you try looking at the data comming into the PC with PROCOM, or SIOW that comes from CCS, or any other standard terminal program? Is there any way to get more info from QBASIC about what type of IO error? Can you look at the serial line with a scope and verify the serial bits out of the PIC?
:=:=SherpaDoug
:=:=
:=:=:=HI,
:=:=:=I am a newbie with CCS. I have a simple appln on PIC16F73 to communicate with a PC, using rs232(8N1 signal). Have a tested HW with MAX233 and 4MH crystal.
:=:=:=I used the project wizard of (PCW - 3.24) and have a simple code sending chars to the serial port, as follows...
:=:=:=/***********************************************************/
:=:=:=#include <16F73.h>
:=:=:=#use delay(clock=4000000)
:=:=:=#fuses XT,PUT,BROWNOUT,NOWDT
:=:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7)
:=:=:=
:=:=:=static int fCount, fFlag;
:=:=:=
:=:=:=main(){
:=:=:=
:=:=:= while(1){
:=:=:= putc('G');
:=:=:= putc('\r');
:=:=:= /* this is buzzer for TESTINg the main loop */
:=:=:= fCount= (fCount+1)\%20;
:=:=:= if(fCount==0){
:=:=:= if(fFlag==0){
:=:=:= output_bit(PIN_A2,1);
:=:=:= fFlag =1;
:=:=:= }
:=:=:= else{
:=:=:= output_bit(PIN_A2,0);
:=:=:= fFlag = 0;
:=:=:= }
:=:=:= }
:=:=:=
:=:=:= }
:=:=:=}
:=:=:=/***********************************************************/
:=:=:=The main loop is working as the buzzer is beeping. But the QBASIC program that try to read the chars sent by the PIC only shows an I/O ERROR !!
:=:=:=
:=:=:=I tried
:=:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)
:=:=:=#use rs232(baud=2400,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
:=:=:=also, but nothing seems to be working.
:=:=:=
:=:=:=Can anybody help me to fix this?
:=:=:=Thanks,
:=:=:=
:=:=:=R Bhaskar
___________________________
This message was ported from CCS's old forum
Original Post ID: 13174