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FahadJani
Guest
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| RS-232, data not sending, PIC 16f876a using MPLAB |
 Posted: Thu Oct 27, 2005 7:52 am |
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Hello friends,
I am a new user of PIC 16f876a. I successfully received data from PICDEM 2 Plus DEMO Board (16f876a) using MPLAB/ICD 2 to PC but i am not able to send data to the PC. Could anybody, please help me out in this situation.
Should be very much thankful.
Please find the code as below:
Best Regards,
Fahad Jani
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, PARITY=E, BITS=8, stream=HOSTPC)
void main(void)
{
char answer;
DISABLE_INTERRUPTS(global);
SETUP_ADC_PORTS(NO_ANALOGS);
SETUP_COMPARATOR(NC_NC_NC_NC);
SETUP_ADC( ADC_OFF );
//Sending data from PIC to PC
printf("New Program\n\r");
printf("1010\n\r");
printf("Continue (Y,N)?\n\r");
do { answer=getchar(); //PROBLEMATIC AREA
}while(answer!='Y' && answer!='N'); // NOT EXECUTING...
printf("Your answer was %c\n\r", answer);
// using hyperterminal for the data sending/receiving
} |
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Ttelmah
Guest
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| Posted: Thu Oct 27, 2005 9:16 am |
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Hint: You are using 'streams', and then not using 'streams'. The command to write to a stream, is fprintf(stream_name.....), not 'printf'. If you don't want to use streams, remove this from the RS232 declaration.
Best Wishes |
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valemike
Guest
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| Posted: Thu Oct 27, 2005 9:28 am |
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| Code: | #include <18F448.h>
#device ADC=10
#fuses HS,NOWDT,NOPROTECT,NOLVP,PUT
#use delay(clock=4000000)
#case
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#ignore_warnings 202
void main(void)
{
char answer;
//Sending data from PIC to PC
printf("New Program\n\r");
printf("1010\n\r");
printf("Continue (Y,N)?\n\r");
do
{
answer=getchar(); //PROBLEMATIC AREA
} while(answer!='Y' && answer!='N'); // NOT EXECUTING...
getchar();
printf("Your answer was %c\n\r", answer);
// using hyperterminal for the data sending/receiving
}
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I tried the program above on my PICDEM2 unit. I am using the ICD2 to debug it. It seems to work ONCE, and when I try running it again, then it doesn't work. It seems a character is getting stuck in stdin (?), which i 'flush' out with the extra getchar() statement. But even then it still gets stuck. If only there was a function to flush stdin. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Oct 27, 2005 12:03 pm |
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| Quote: | | I am not able to send data to the PC. |
Try a simple program, as shown below.
Get rid of the Even Parity in your PIC program, and in Hyperterminal.
Also get rid of the streams. When you make a test program, keep it simple.
| Code: |
#include <18F448.h>
#fuses XT,NOWDT,NOPROTECT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
void main()
{
char c;
while(1)
{
c = getc(); // Wait for a char from the PC
putc(c); // Then send it back to the PC
}
} |
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