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uni_student
Joined: 01 Aug 2007
Posts: 38
Location: AUckland, NEW ZEALAND
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| 2 lines of code greedy on ROM |
 Posted: Fri Oct 09, 2009 10:45 pm |
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Pic 16f716
Before adding these 2 lines ROm usage is 78%
| Code: |
dist=dist + (atof(temp)/3600);
printf("%1.2fkm ", dist);
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After "Out of ROM" Error mesage.
How can I fix this? Any help appreciated. |
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andrewg
Joined: 17 Aug 2005
Posts: 316
Location: Perth, Western Australia
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| Posted: Fri Oct 09, 2009 11:46 pm |
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Floating point code takes up a lot of space. Stick to integer math wherever possible.
From the code you've given, you're only needing to track distance in kilometers to 2 decimal places, i.e. to 10m. So count in multiples of 10m.
| Code: | dist = dist + temp / 36;
printf("%ld0m", dist); |
There are other things to try. You could shift the "/36" to the printf to maintain precision. You could print to a buffer (see sprintf), allowing you to shuffle characters around and insert a decimal place for kms before displaying.
_________________
Andrew |
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uni_student
Joined: 01 Aug 2007
Posts: 38
Location: AUckland, NEW ZEALAND
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| Posted: Sat Oct 10, 2009 12:18 am |
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andrewg
I used a less precise measurement in conjunction with atoi instead of atof which has certainly fixed the problem.
Cheers |
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