Rin Shipa

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10 years ago.

Serial data from Matlab

Has anyone tried sending data from Matlab to F401RE over serial interface? If possible, is there any method to receive data using serial ISRs?

I am trying to get some floating point numbers from Matlab and could not succeed with the following code:

F401RE CODE:

#include <mbed.h>
Serial pc(USBTX, USBRX);
int cycle = 0;

int main()
{
    float counter = 0;
    float number;

    while (1) {
        counter = counter + 0.5f;

        if (pc.readable() > 0) {
            pc.scanf("%f",&number);  
            pc.printf("%f, %f\n", counter, number);
        }
        if (counter ==5.0f) counter = -5.0f;
        wait_ms(2000);
    }
}


Matlab Code

try
    answer=3; % this is where we'll store the user's answer
    mbed = serial('COM4','BaudRate', 9600, 'Parity', 'none','DataBits', 8,'StopBits', 1);
    TIMEOUT = 5;
    set(mbed,'Timeout',TIMEOUT);
    %set(mbed,'Terminator','LF');
    fopen(mbed); % initiate  communication

    fprintf(mbed,'%f\n',answer); % send
    %pause(1);
    values = fscanf(mbed, '%f,%f')
    
    fclose(mbed);
    
catch
    %in case of error or mbed being disconnected
    disp('Failed!');
    fclose(mbed);   %close connection to prevent COM port being lokced open
end
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