Error "failed to connect to target"

[Andres Molina]

Error: "Failed to connect to target" nRF52832 

Hello

I have a problem. I was making a program for a counter. I managed to upload it to the card and communicate with PUTTY through COM3. Then I tried to load another program and it didn't work.

Currently it throws me this error. I tried changing the cable, turning off the device, trying to restart it but nothing worked. Also, it happened to me that I tried to do a reboot by holding down the RESET button to load the boot loader but it didn't work either.

I would greatly appreciate your help to recover the device

This is the program:

#include <stdbool.h>
#include <stdint.h>

#include "nrf.h"
#include "nordic_common.h"
#include "boards.h"
#include "nrf_delay.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

/**
* @brief Function for application main entry.
*/
int main(void)
{

APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();

NRF_LOG_INFO("This is log data from nordic device..");

uint32_t count = 0; //creacion de un contador

while (true)

{
NRF_LOG_INFO("Counter Value: %d", count); //funcion similar al printf
nrf_delay_ms(500);
count++; //incrementa el valor del contador
}
}
/** @} */

[Joakim Jakobsen]

Hi. 

Have you tried using nrfjprog to --recover the device. Or connecting to the device using the nRF Connect Programmer app?

________

What happens when you power the device? Can you see any LEDs lighting up?

Br, 
Joakim

[Andres Molina]

 I just opened the nrf programmer, selected the device and tapped eraseall, but got the following error. Also, I tried to load the blinking example but it didn't work either.

[Joakim Jakobsen]

Happy to help

____

Feedback from our developers; 

Could you try to reproduce the issue using nrfutil device and recover the device with --log-level trace and send us the logs?

nRF Util can be downloaded here: 
https://www.nordicsemi.com/Products/Development-tools/nrf-util 

Documentation: 
https://infocenter.nordicsemi.com/pdf/nRF_Util_v7.0.0.pdf 

Br, 
Joakim

[Andres Molina]

Hello! Joakim

I was able to follow the guide and install the nrfutil, this is the output of terminal

It shows me this error, but I don't know what it means with (TRAITS) and (SERIAL_NUMBERS)

[Andres Molina]

I just used this command, but I don't know which of all the TRAITS options to use and i have another question, the the serial number is 1050301640?

Thank you!

[Andres Molina]

[Joakim Jakobsen]

Thank you!

Will get back to you if I need more information.

Br,
Joakim

[Joakim Jakobsen]

Hi again. 

Our developers need the logs in order to investigate any further. Could you please upload the log as well?

Thanks, 
Joakim

[Jesus Cano]

I created a new post with a very similar problem I am having right now. You can find the nrfjprog logs in that post  nRF52-DK "Failed to connect to target" and "Access protection is enabled, can't read device version"

[Andres Molina]

How can I show the registers for you?

[Joakim Jakobsen]

As you can see in nRFutil you have the "log output" command. If you select file, you can upload the logs here.

Thanks,
Joakim

[Andres Molina]

Hello Joakim 

I try to use the following command nrfutil device --log-output=file but, nothing happened, I don't know if I misspelled the command.

C:\>nrfutil device --log-output=file
nrfutil-device

USAGE:
    nrfutil device [OPTIONS] [SUBCOMMAND]

OPTIONS:
    -h, --help                       Print help information
        --help-extended              Show comprehensive documentation
        --json                       Print output as JSON
        --json-pretty                Print output as formatted JSON
        --license                    Show license information for in-built dependencies
        --log-level <LOG_LEVEL>      Set the maximum log level [possible values: off, error, warn, info, debug, trace]
        --log-output <LOG_OUTPUT>    Set log output type: --log-output=stdout --log-output=file ... [possible values: file, stdout]
        --skip-overhead              Skip all message overhead when in JSON output mode, outputting only the data part of "info" messages and ignoring the rest
    -V, --version

SUBCOMMANDS:
    core-info         Get core info on devices
    erase             Erase firmware on devices
    fw-info           Get firmware info from devices
    fw-verify         Verify firmware on devices
    help              Show comprehensive documentation
    list              List devices
    mcu-state-set     Set mcu state on devices
    program           Program devices
    protection-get    Get readback protection status from devices
    protection-set    Enable readback protection on devices
    recover           Erase all user available non-volatile memory and disable readback protection if enabled
    reset             Reset devices

C:\>