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project2010
Joined: 14 Mar 2010
Posts: 21
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| ds1307 problem |
 Posted: Sat May 01, 2010 12:50 pm |
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I'm using the following driver
http://www.ccsinfo.com/forum/viewtopic.php?t=23255
only one problem on it
// Set date for -> 15 June 2005 Tuesday
// Set time for -> 15:20:55
ds1307_set_date_time(15,6,5,2,15,20,55);
I try to set the date in 10may2009 fri 20:30:00
I write
ds1307_set_date_time(10,05,09,05,20,30,00);
But it have an error
| Quote: |
*** Error 51 "test.c" Line 282(28,29): A numeric expression must appear here
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I write (10,05,9,05,20,30,00);
or
(10,05,10,05,20,30,00);
It will be ok
Why 9 can't write 09 in this case?
Thank you |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat May 01, 2010 10:10 pm |
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| Quote: |
Why 9 can't write 09 in this case?
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It's because the number has a leading zero in front of it. In that case,
the compiler interprets it as an Octal number and 09 is a not a valid
Octal number. In the Octal number system, the digit values can only be
from 0 to 7.
Octal isn't used that much anymore, but it is built-in to the compiler.
Each number system is indicated to the compiler by a prefix:
0b = binary
0x = Hexadecimal
0 = Octal
nothing = decimal |
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