From: David Kelly <[EMAIL PROTECTED]>
[...]
char buffer[4];
uint8_t i;
strncpy_P( buffer, PGM_P("000"), 3 );
i = 2;
while(x) {
buffer[i--] = x%10 + '0';
x = x/10;
}
putchar(buffer[0]);
putchar('.');
putchar(buffer[1]);
putchar(buffer[2]);
In the above I find myself wishing for the FORTH /mod operator. Avr- gcc
calls exactly the same routine for division or modulo and stores the
desired result. In assembly we could store both but I don't see how to get
at both from C. Is possible the compiler could optimize it but plain -O
didn't in recent tests.
Try something like
#include <stdlib.h>
...
div_t qr;
while(x) {
qr = div(x,10);
buffer[i--] = qr.rem + '0';
x = qr.quot;
}
I'm not certain this is optimal. I haven't looked closely, but it looks
like it should be. It certainly has the opportunity to be.
Regards,
-=Dave
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