Robert Mahon

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7 years, 6 months ago.

USART communication between STM32F411 to PC

I am trying to print the measurement of an analog signal on my PC in Tera Term using USART though pins PA_9 and PA_10. When I run the below code I get a bunch of gibberish. I checked the baud rates and they are the same. When displaying the below code through the USB it works fine, only when it is using USART I get gibberish. Any help would be greatly appreciated. 

int main() {
    float meas;
    serial.baud(9600);
    serial.format(8, Serial::None, 1);
    
    printf("\nAnalogIn example\n");
    
    while(1) {
        meas = analog_value.read(); // Converts and read the analog input value (value from 0.0 to 1.0)
        meas = meas * 3300; // Change the value to be in the 0 to 3300 range
        printf("measure = %.0f mV\r\n", meas);
        serial.printf("measure = %.0f mV\r\n", meas);
        wait(1);
    }
}

1 Answer

Jenny Plunkett
7 years, 5 months ago.

Hi Robert,

If you are using Mbed OS 5 I would try the following example to print to the serial terminal: https://os.mbed.com/docs/latest/reference/serial.html#serial-hello-world

I might try commenting out the serial.format(8, Serial::None, 1); line to see if that helps.

- Jenny, team Mbed