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ljbeng
Joined: 10 Feb 2004
Posts: 205
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| printf... this is sad :( |
 Posted: Fri Oct 06, 2006 8:19 am |
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FYI
I compared two different ways to display data to the lcd, one using the %w command and the other using the ldiv command. There is a huge difference in how long it take to print the data to the lcd. The %w takes 40ms at 4.096Mhz to print 32 characters to the lcd. The ldiv takes 4ms to print 32 characters. This has been a nightmare. I have to go back through 3 programs and change them back to ldiv. I will send this off to CCS as well. Thanks.
| Code: | output_high(a1);
printf(lcd_putc,"\t%04.2w ",fwdepth);
printf(lcd_putc,"\b%04.2w ",rvdepth);
output_low(a1);
output_low(a2);
delay_ms(100);
output_high(a1);
result = ldiv(fwdepth,100);
printf(lcd_putc,"\t%01ld.%02ld ",result.quot,result.rem);
result = ldiv(rvdepth,100);
printf(lcd_putc,"\t%01ld.%02ld ",result.quot,result.rem);
output_low(a1);
output_low(a2);
delay_ms(100); |
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Ttelmah
Guest
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| Posted: Fri Oct 06, 2006 8:32 am |
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The key difference, is that 'ldiv', only supports 15bit integers, while %w, internally uses int32.
ldiv, is the faster solution, provided you are only using smaller values.
%w, comes into it's own for people who want to (say), use values like 10000.00.
Best Wishes |
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