USB_Debugger.md

Printing using the USB Debugger

On the discovery board there in issue with using Printf statements for debugging.

We are able to make use of a USB to serial Debugging cable to work around this.

Connecting the Cable

You will need to connect the debugger to the board using output PINs.

Cable	Role	Pin
White	RX	PA_2
Green	TX	PA_3

If the board is already connected via USB (for uploading code), there is no need to connect the power and ground pins.

Code for Printing

We first need to setup the Serial Connection.

#include "mbed.h"

Serial serial(PA_2,PA_3);

We can then print using the serial.printf() statements.

Demonstration Code below:

#include "mbed.h"


Serial serial(PA_2,PA_3);
// tx, rx


int main() {

//serial.baud(115200);

  serial.printf("Hello World!\n\r");

  while(1) {
    wait(1);
    serial.printf("Hello World!\n\r");
    }

}

Configuring the Serial Monitor

You may also need to configure the serial monitor to listen on the correct port. We can do this by modifing the platformio.ini file to include

monitor_port = /dev/ttyUSB0