Multiple AnalogIn/AnalogOut needs continuous initialization on Nucleo F334R8

[bunjes]

I want to sample multiple AIn channels and simultaneously output the values to two AOut channels.

The following code works with one ain/aout combination, but if I add the definition of the second AnalogIn/AnalogOut objects, the AOut stops working:

 #include "mbed.h"

int main() {

   // Combination 1
    AnalogOut aout1(PA_5);
    AnalogIn ain1(PC_0);

    // Combination 2
    AnalogOut aout2(PA_6);
    AnalogIn ain2(PC_1);

    while(1) {

        aout1.write_u16(ain1.read_u16());

        aout2.write_u16(ain2.read_u16());

        wait_ms(1); 
    }
}

With both combinations active, I get 0V on PA_5, no matter what is on PC_0, but PC_1 -> PA_6 is still working.

Moving the constructions into the loop partially resolves the problem, but there are artefacts in the output, maybe due to the continuous re-initialization of the DAC/ADC:

 #include "mbed.h"

int main() {

    while(1) {

        // Combination 1
        AnalogOut aout1(PA_5);
        AnalogIn ain1(PC_0);

        // Combination 2
        AnalogOut aout2(PA_6);
        AnalogIn ain2(PC_1);

        aout1.write_u16(ain1.read_u16());

        aout2.write_u16(ain2.read_u16());

        wait_ms(1); 
    }
}

Any help is appreciated.

[ciarmcom]

ARM Internal Ref: IOTMORF-266

[LMESTM]

I'm working on it - a PR should be available this week

[LMESTM]

@bunjes - See PR #4529 - should solve your issue - feedback welcome

[LMESTM]

@bunjes @0xc0170
#4529 has been merged so issue now solved - please close (and re-open is any problem)

[bunjes]

Thanks for solving. Two years and two months are quite a time span...
I hope you didn't work on the solution all this time ;-)

[LMESTM]

@bunjes I'm afraid this issue went through the net for all this time ... we're now cleaning up in a more systematic way to avoid this happens again ;-)

[jeromecoutant]

ST_TO_BE_CLOSED