Can't set baud rate!

Mbed OS
1

Hi. I’m trying to write a program to make an LED turn on by pressing 1 and turn off again by pressing 0. I’m using the STM32 Discovery Kit by ST Electronics (B-L475E-IOT01A).

I think the problem is that setting the baud rate does not work.

Here is my code so far:

#include "mbed.h"

DigitalOut led1(PC_5);

BufferedSerial pc(USBTX, USBRX);    

int main(){
    int toggle;

    pc.set_baud(115200);

    printf("This is the bare metal blinky example running on Mbed OS %d.%d.%d.\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);

    while (true)
    {
        printf("Please type 1 or 0:");
        scanf("%i", &toggle);
        printf("%i \n", toggle);
        led1.write(toggle);
        
    }
}

Any ideas? It does not work!

2

Hello,

when you set baud rate of your aplication to 9600, then does it work? Or what do you see in your terminal as output?

BR, Jan

3

It just printed rubbish then. However, we solved it by simply using .read() and .write() functions from the BufferedSerial class :slight_smile:

4

Hi
Easiest way is to remove all reference to “pc”,;
and use a mbed_app.json file to override default baud rate.
Example there: