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cchappyboy
Joined: 03 Dec 2008
Posts: 45
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| Question about kbhit() and fgetc(stream) |
 Posted: Thu Apr 30, 2009 10:54 am |
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I use pic18f458 and set 2 uart port
| Code: | #use rs232(baud=2400,xmit=tx_1,rcv=rx_1,stream=g)
#use rs232(baud=9600,xmit=tx_2,rcv=rx_2,stream=d) |
I want to use stream d to receive data
| Code: |
int timed_getc(long m,int n)
{
long timeout=0;
while(!kbhit(d)&&(++timeout<m)) //if m=100 n=10 wait untill 1ms
{
delay_us(n);
}
if(kbhit(direct))
return(fgetc(d));
else
{
return(0);
}
}
void main()
{
while(true)
{
rec=timed_getc(100,10);
fprintf(direct,"%C\n\r",rec);
}
} |
The input stream is like
| Quote: | | AB-DEFG123.123 ASGDS123.12345crlf |
I can not get right output.
I appreciate help. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 30, 2009 12:37 pm |
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| Quote: | #use rs232(baud=2400,xmit=tx_1,rcv=rx_1,stream=g)
#use rs232(baud=9600,xmit=tx_2,rcv=rx_2,stream=d) |
What pins are used for "tx_1", etc.
Post those two lines with the actual CCS pin number constants. |
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cchappyboy
Joined: 03 Dec 2008
Posts: 45
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| Posted: Thu Apr 30, 2009 6:22 pm |
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#define tx_1 pin_c6
#define rx_1 pin_c7
#define tx_2 pin_c0
#define rx_2 pin_c1
In main()
indicate
int rec=0; |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Fri May 01, 2009 2:05 am |
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Shouldn't this line
if(kbhit(direct))
be
if(kbhit(d))
?
Where is direct defined ? |
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cchappyboy
Joined: 03 Dec 2008
Posts: 45
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| Posted: Fri May 01, 2009 6:42 am |
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yes, direct should be d.
it is just mistake when i post in here.
Thanks |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Fri May 01, 2009 6:50 am |
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If there is a gap of 1sec in the data stream your function will return 0 which you still print out. This char may mess up your output so it looks like something is wrong when it isn't.
Try putting a check in
| Code: |
rec=timed_getc(100,10);
if (rec != 0)
fprintf(direct,"%c\n\r",rec);
|
I noticed you are using an upper case C in the printf statement. Case does matter and the normal form displaying a char is a lowercase c. Not sure how CCS would handle this. |
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