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.

~~~c
#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
~~~