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standard_io vs fixed_io

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SeeCwriter

Joined: 18 Nov 2013
Posts: 159

standard_io vs fixed_io

Posted: Tue Jun 04, 2019 10:12 am

Reply with quote

I thought fixed_io was supposed to save ram and be faster than standard, but that does not seem to be the case. Is there something I'm missing?

Code:

.................... #use STANDARD_IO( C )
.................... output_high( PIN_C2 );
03100: BCF F94.2
03102: BSF F8B.2
.................... output_low( PIN_C2 );
03104: BCF F94.2
03106: BCF F8B.2
.................... #use FIXED_IO( C_outputs=PIN_C2 )
.................... output_low( PIN_C2 );
03108: MOVLW FB
0310A: MOVWF F94
0310C: BCF F8B.2
.................... output_high( PIN_C2 );
0310E: MOVLW FB
03110: MOVWF F94
03112: BSF F8B.2
....................

Ttelmah

Joined: 11 Mar 2010
Posts: 19245


Posted: Tue Jun 04, 2019 10:34 am

No. Fast_io saves ROM, and is quicker. Fixed_io does neither. All it does is ensure the IO is fixed (doesn't change).

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