7 years, 11 months ago.

Nordic nRF52-DK stops its serial communication with a linux pc

I used a windows pc with tera term for the serial communication until now (with online compiler). There everything was working fine. But i wanted to switch to Linux (arch) for the mbed cli. Compiling is working fine, but the connection to the serial port always quits after a first few transmission and the LED stops at its current condition.

I tested multiple Serial terminals in Linux (cat, screen, putty,picocom...) but everywhere the same behaviour. The "port" was always /dev/ttyACM0.

So I first thought the maybe my Linux configuration has some problems but i tested with an arduino under the same conditions and everything worked fine (9600 baud rate, 8 bits, 1 stop bit, no parity).

Now to the question: Is there a bug with the mbed library or the nrf52-DK using the serial port? And is there a workaround?

Greetings, Chris

Here the simple code example i used to test the "bug":

#include "mbed.h"

DigitalOut led1(LED1);

Serial pc(USBTX, USBRX); // tx, rx

int main() {
    int counter = 0;
    while (true) {
        pc.printf("test %d \n", counter);
        counter++;
        led1 = !led1;
        Thread::wait(500);
    }
}

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Last updated: 30 Jun 2020

Nordic nRF52-DK

The nRF52 Development Kit is a single-board development kit for Bluetooth Smart, ANT and 2.4GHz proprietary applications using the nRF52 Series SoC. This kit supports both development for nRF52832 SoCs.