>From 'info gcc',
...
You can prevent an `asm' instruction from being deleted, moved
significantly, or combined, by writing the keyword `volatile' after the
`asm'.
Changing the code fragment to
...
dtostrf(cos_rad,6,3,&line4[14]);
line3[20] = ' ';
line4[20] = ' ';
asm volatile("sbi 0x1b,4" : :);
atan_rad = atan2(cos_rad,sin_rad);
asm volatile("cbi 0x1b,4" : :);
dtostrf(atan_rad,6,3,&line4[26]);
...
does not alter the result.
The .elf code is incorrect!
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