#include "mbed.h"

AnalogIn ain(PA_0);
AnalogOut aout(PA_6);

int main() 
{   
    float meas;
    float out_value;
    float diff;
    printf("Start \n");
    while(1) 
    {  
     for (out_value = 0.0f; out_value <= 1.0f; out_value += 0.01f) {
        aout.write(out_value);
        wait(0.3);        
        diff =(out_value - meas);
        printf("(out:%.4f) - (in:%.4f) = (%.4f) \n", out_value, meas, diff);
        } 
        
    }
}

#include "mbed.h"

AnalogIn ain(PA_0);
AnalogOut aout(PA_6);

int main() 
{   
    float meas;
    float out_value;
    float diff;
    printf("Start \n");
    while(1) 
    {  
     for (out_value = 0.0f; out_value <= 1.0f; out_value += 0.01f) {
        aout.write(out_value);
        wait(0.3);        
        meas = ain.read(); // THIS IS THE NEW LINE
        diff =(out_value - meas);
        printf("(out:%.4f) - (in:%.4f) = (%.4f) \n", out_value, meas, diff);
        } 
        
    }
}

Hello Guys, i have run into some problems with the NUCLEO-F303K8. My goal is to use an analog output (later all three of them PA_4, PA_5 or PA_6) while reading this output with several Analog input. I have removed SB 16 and SB 18 as stated in the handbook to 'float' PA_5 and PA_6. When I use this code without reading the input everything works just fine. <<code title=Working Code>> #include "mbed.h" AnalogIn ain(PA_0); AnalogOut aout(PA_6); int main() { float meas; float out_value; float diff; printf("Start \n"); while(1) { for (out_value = 0.0f; out_value <= 1.0f; out_value += 0.01f) { aout.write(out_value); wait(0.3); diff =(out_value - meas); printf("(out:%.4f) - (in:%.4f) = (%.4f) \n", out_value, meas, diff); } } } <</code>> If i add the reading function of A0 the output stucks and doesn't output the correct voltage <<code title=Not working Code>> #include "mbed.h" AnalogIn ain(PA_0); AnalogOut aout(PA_6); int main() { float meas; float out_value; float diff; printf("Start \n"); while(1) { for (out_value = 0.0f; out_value <= 1.0f; out_value += 0.01f) { aout.write(out_value); wait(0.3); meas = ain.read(); // THIS IS THE NEW LINE diff =(out_value - meas); printf("(out:%.4f) - (in:%.4f) = (%.4f) \n", out_value, meas, diff); } } } <</code>> The biggest surprise is that if I'm using PA_4 instead of PA_6 or PA_5 to output the voltage - it works. How can i fix this problem? Is the code wrong or is it a hardware issue? What could it be? P.S. I tried it with 3 different Boards.

On STM32F series I think they all use PA_4 and PA_5 for DAC output. Yes, I checked the data sheet for the STM32F303, it uses PA_4 and PA_5 , only two DACs.... To output a voltage, PA_6 will not work..

No.. 3 DACS - had to program it directly over the registers. Could be a bug.