Serial monitor visualizing problem

Mbed Studio
1

Hello,

Here is how terminal output looks:
terminal output

Here is function whre output to terminal occurs:

void displayThread()
{
char buffer[128];

printf("\033[2J\033[H"); // Clear Screen and go Home
printf("\033[?25l"); // Turn the cursor off
fflush(stdout);

while(1)
{
    osEvent evt = queue.get();
    if (evt.status == osEventMessage) {
        msg_t *message = (msg_t*)evt.value.p;
        switch(message->cmd)
        {
            case CMD_temperature:
                sprintf(buffer,"Temperature = %2.1fF",message->value);
                displayAtXY(1, 1, buffer);
            break;
            case CMD_setPoint:
                sprintf(buffer,"Set Point = %2.1fF",message->value);
                displayAtXY(1, 2, buffer);
            break;
            case CMD_time:
                time_t rawtime;
                struct tm * timeinfo;
                time (&rawtime);
                rawtime = rawtime - (5*60*60); // UTC - 4hours ... serious hack which only works in winter
                timeinfo = localtime (&rawtime);
                strftime (buffer,sizeof(buffer),"%r",timeinfo);
                displayAtXY(1,3, buffer);
            break;
            case CMD_mode:
                if(message->value == 0.0)
                    sprintf(buffer,"Mode = Off ");
                else if (message->value < 0.0)
                    sprintf(buffer,"Mode = Heat");
                else
                    sprintf(buffer,"Mode = Cool");
                displayAtXY(1, 4, buffer);
            break;

        }
        mpool.free(message);

    }
}

}

Any comments ?
Thanks.

2

I tried today. Today, I don’t see anything at all in Serial Monitor.
In the meantime I proceeded to upgrade to the version 0.9.
This is probably a bug in version 0.9.

3

Here is the simplest code:
int main()
{
printf(“Started System\n”);
}
Nothing at all in Serial Monitor

4

Did you try a baud rate of 9600 in the terminal? I believe that is the default…

Otherwise, what is the declaration & initialisation of your serial port?

5

Yes, I’ve tried all rates.
Moreover, I’ve also tried with .json file:
{
“target_overrides”: {
“*”: {
“platform.stdio-baud-rate”: 115200
}
}
}
*

Otherwise, what is the declaration & initialisation of your serial port?

There is no declaration/initialization. The link on the project that apparently works on MacOS is here:
https://iotexpert.com/2019/12/09/mouser-psoc-6-wifi-bt-mbed-l3-display-thread/

6

I’m using MBed Studio 0.9 and it doesn’t have any problems writing to the serial port (both USB and traditional UART).

OTOH, I always explicitly declare a serial port along the lines of:

7

I don’t know what the problem was, but today it works. Probably some problem with Windows preventing the COM port from communicating.

8

Hi Pavel,

I’m glad that it works for you. The two most common causes of this issue are:

  1. Having a serial monitor open outside of Mbed Studio. Only one serial monitor can have access to the board at the same time.
  2. There is a regression in Mbed Studio 0.9.0. Serial panel is not reopening correctly for a board when it was closed manually using a close (x button). We are working on a fix. It will be fixed in upcoming release. Until then restarting Mbed Studio is the only way to fix it. Disconnecting and reconnecting a board is not triggering this issue. Only manual close.

Thanks,
Arek - Mbed Studio team