P. Xrist

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7 years, 6 months ago.

DigitalOut read() method

Hi,

I've just started playing with F303K8 Nucleo board.

I tried to modify the blink example as follows:

#include "mbed.h"

DigitalOut myled(D4,0);

DigitalOut t(D5,0);

int main() {

    while(1) {

        myled.write(1); // LED is ON

        int k=myled.read();

        t.write(k);

        wait(1.0); // 1s

        myled.write(0); // LED is OFF

        k=myled.read();

        t.write(k);

        wait(1.0); // 1 sec

    }

}

The problem is that k is 0 when myled is on and 1 when myled is off.

Can you help me ?

Thanks in advance !

I've tested with Nucleo f103rb and ir works as it should. So maybe is something related to the board.

posted by P. Xrist 28 May 2018

1 Answer

Karen Yen
7 years, 6 months ago.

Hello there,

It could be that that board was made active low (i.e. LED is on when it is set to 0 and vice versa). Hope this helps!

-Karen, team Mbed