Error when i changed NRF_LOG_ENABLED from 0 to 1

[VivekPkd]

Hi,

When i changed NRF_LOG_ENABLED from 0 to 1  in file sdk_config.h returns the following error

1> Linking tdoa_tag.elf
1> E:/gcc/arm-none-eabi/bin/ld: Output/Debug/Obj/tdoa_tag/app_error_weak.o: in function `app_error_fault_handler':
1> F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:59: undefined reference to `nrf_log_panic'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:59: undefined reference to `nrf_log_frontend_dequeue'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:77: undefined reference to `nrf_log_frontend_std_2'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:85: undefined reference to `nrf_log_frontend_std_5'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:91: undefined reference to `nrf_log_frontend_std_0'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:95: undefined reference to `nrf_log_frontend_std_1'
1> E:/gcc/arm-none-eabi/bin/ld: F:\VIVEK\Test Area\DWM1001C_TDoA_Tag\components\libraries\util/app_error_weak.c:109: undefined reference to `m_nrf_log_app_logs_data_const'
Build failed

[VivekPkd]

my main.c  i added 

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

 APP_ERROR_CHECK(NRF_LOG_INIT(NULL));

 NRF_LOG_DEFAULT_BACKENDS_INIT();
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_INFO("TWI scanner.\r\n");
 NRF_LOG_FLUSH();

still error there , so i deleted these and build same error

[VivekPkd]

good, thats cleared all errors and warning .(SES). But Nothing showing in Debug Terminal . similar questions i found in this site tried still no output

#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

int main(void)
{
    /* Initializing Log */
    ret_code_t err_code;
    err_code = NRF_LOG_INIT(NULL);
    NRF_LOG_DEFAULT_BACKENDS_INIT();

    while (true)
    {
        for (int i = 0; i < 5; i++)
        {
            NRF_LOG_INFO("BLINK");
            nrf_delay_ms(500);
        }
    }
}

[Marte Myrvold]

Hi,

Have you enabled the following in sdk_config.h as well?

• Log backend, either UART (NRF_LOG_BACKEND_UART_ENABLED) or RTT (NRF_LOG_BACKEND_RTT_ENABLED)
• NRF_LOG_DEFAULT_LEVEL, this should be set to 3 for INFO

Does NRF_LOG_INIT return NRF_SUCCESS or an error code? You can check by adding the following line after calling the init:

APP_ERROR_CHECK(err_code);

Best regards,

Marte