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SimpleGuy
Joined: 12 Dec 2008
Posts: 7
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| A little help with printf() |
 Posted: Wed Apr 01, 2009 6:55 am |
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Hi all,
I am trying to output to the serial port a word (2bybte) with out any formatting. So if I have a variable with 64(dec) when I send it out to hyper terminal I will get nul@(ascii)
nul=0
@=64
My best bet but did not work how I expected
int16 X;
X=64;
printf("%s",X); |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Wed Apr 01, 2009 7:10 am |
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%s will try and display a string pointed to by the var (X) in this case. X does not actualy point to a string so you will get strange results.
You are trying to display 2 chars, the first is the upper byte of X and the second is the lower byte of X. you could do this like
| Code: | | printf("%c%c", X >> 8, X); |
BUT you will have a problem because the ascii char for 0 (X >> 8) is an unprintable character, you will get anything from nothing displayed to a strange char, you wont see the value 0.
So we need to know what you are trying to do so we can offer you a better option. You could print the values
| Code: | | printf("%d%d", X >> 8, X & 0xFF); |
There are lots of other options for you as well.
Your best option is prob
| Code: | putc(X >> 8);
putc (X & 0xFF); // putc(X); |
will prob work but I will leave you to try. |
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SimpleGuy
Joined: 12 Dec 2008
Posts: 7
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| Posted: Wed Apr 01, 2009 7:43 am |
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| thank you i am all set now. |
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