Igor Skochinsky / Mbed 2 deprecated FastIO

Fast GPIO using C++ templates. Now with port I/O.

Dependencies:   mbed

main.cpp@4:b8e40f2a0aac, 2010-05-25 (annotated)

Committer:
igorsk
Date:
Tue May 25 08:35:39 2010 +0000
Revision:
4:b8e40f2a0aac
Parent:
3:8d217a0bb245 

        

        
Who changed what in which revision?

        

            
                
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#include "mbed.h"





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#include "FastIO.h"





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#define LED_MASK 0x07800000





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DigitalOut led1(LED1);





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FastOut<LED2> led2;





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PortOut ledport(Port0, LED_MASK);





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FastPortOut<Port0, LED_MASK> ledport2;





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MaskedPortOut<Port0, LED_MASK> ledport3;





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Timer t;





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#define LOOPS 100000000





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int main() {





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    int value = 0;





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    int count = LOOPS;





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    t.start();





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    while ( count -- )





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    {





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        led1.write(value);





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        value = 1-value;





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    }





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    t.stop();





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    printf("DigitalOut: %f seconds (%d ns per iteration).\n", t.read(), t.read_us()/(LOOPS/1000));





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    count = LOOPS;





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    t.reset();





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    t.start();





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    while ( count -- )





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    {





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        led2 = value;





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        value = 1-value;





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    }





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    t.stop();





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    printf("FastOut: %f seconds (%d ns per iteration).\n", t.read(), t.read_us()/(LOOPS/1000));





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    count = LOOPS;





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    t.reset();





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    t.start();





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    value = LED_MASK;





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    while ( count -- )





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    {





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        ledport.write(value);





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        value ^= LED_MASK;





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    }





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    t.stop();





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    printf("PortOut: %f seconds (%d ns per iteration).\n", t.read(), t.read_us()/(LOOPS/1000));





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    count = LOOPS;





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    t.reset();





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    t.start();





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    value = LED_MASK;





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    while ( count -- )





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    {





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        ledport2 = value;





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        value ^= LED_MASK;





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    }





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    t.stop();





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    printf("FastPortOut: %f seconds (%d ns per iteration).\n", t.read(), t.read_us()/(LOOPS/1000));





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    count = LOOPS;





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    t.reset();





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    t.start();





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    value = LED_MASK;





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    while ( count -- )





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    {





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        ledport3 = value;





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        value ^= LED_MASK;





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    }





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    t.stop();





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    printf("MaskedPortOut: %f seconds (%d ns per iteration).\n", t.read(), t.read_us()/(LOOPS/1000));





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}