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jan_boes
Joined: 04 Feb 2004
Posts: 3
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| receiving and sending multiple characters |
 Posted: Fri Feb 13, 2004 6:55 am |
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i want to sent multiple characters from a computer through a serial cable(example 111or 123 or a2r).
When i received this i want to put it on LCD and back to the computer.
When i look at the screen [/color]on my computer and LCD a only see the first character that i have send.
i use
fgetc(stream) to receive the signal ,
fputc(stream) to send the signal to the computer and
lcd_putc(x) for the LCD.
x=fgetc(stream).
thanks in advance[color=darkred][/color][color=yellow][/color] |
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Ttelmah
Guest
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| Re: receiving and sending multiple characters |
| Posted: Fri Feb 13, 2004 8:18 am |
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| jan_boes wrote: | i want to sent multiple characters from a computer through a serial cable(example 111or 123 or a2r).
When i received this i want to put it on LCD and back to the computer.
When i look at the screen [/color]on my computer and LCD a only see the first character that i have send.
i use
fgetc(stream) to receive the signal ,
fputc(stream) to send the signal to the computer and
lcd_putc(x) for the LCD.
x=fgetc(stream).
thanks in advance |
fgetc, gets one character.
So to deal with multiple characters, you have to loop.
Hence something like:
| Code: |
while (true) {
x=fgetc(stream);
fputc(stream);
lcd_putc(x);
}
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Depending on the actual data involved, and the delays involved, it may be better to consider something like:
| Code: |
int8 buffer[10];
int8 ctr,x;
while (true) {
ctr=0;
while ((x=fgetc(stream))!='\n') {
buffer[ctr++]=x;
if (ctr==8) break;
}
buffer[ctr+1]='\0';
fprintf(stream,"%s\n",buffer);
printf(lcd_putc,"%s\n",buffer);
}
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This loops on a 'string' basis, stopping when a line feed is seen, or 9 characters have been received, and then echoing the whole string to the serial and the display.
Best Wishes |
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