Jlink RTT Viewer not working with NRF52832

RE: Jlink RTT Viewer not working with NRF52832

tgao — Wed, 20 Jul 2022 13:18:43 GMT

Hi, I am also experiencing the same problem with the same board. I am also using UART for a separate logging system involving printf(), but I also want to get NRF_LOG working, because I want to see the logs in the bootloader and other areas where UART cannot readily display. I have tried everything suggested in this thread so far but still don't see any logs in RTT viewer. Can anyone advise?

RE: Jlink RTT Viewer not working with NRF52832

Jared — Thu, 07 Jul 2022 07:45:29 GMT

Hi,

I think you might have to restart the J-Link RTT Viewer program.

regards

Jared

RE: Jlink RTT Viewer not working with NRF52832

meet10 — Wed, 06 Jul 2022 14:17:59 GMT

Hi Jared

instead of blinky example i am referring to twi_sensor example as i wanted to work with rtt. I have totally modify the code to simple one and in sdkconfig i have have enabled NRF_LOG_BACKEND_RTT_ENABLED 1,NRF_LOG_ENABLED 1 and NRF_LOG_BACKEND_UART_ENABLED 0 to use rtt instead of uart.

The modified code is

#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_backend_rtt.h"
#include "nrf_log_default_backends.h"

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

// Initialize the Logger module and check if any error occured during initialization
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));

// Initialize the default backends for nrf logger
NRF_LOG_DEFAULT_BACKENDS_INIT();

// print the log msg over uart port
printf("This is log data from nordic device..\r\n");
NRF_LOG_INFO("This is log data from nordic device..\r\n");

// a variable to hold counter value
uint32_t count = 0;

while (true)
{

// Dsiplay the logger info with variable
printf("Counter Value: %d \r\n", count);
NRF_LOG_INFO("Counter Value: %d \r\n", count);
nrf_delay_ms(500); // delay for 500 ms
count++; // increment the counter by 1
}
}

Before diconnecting I get logs in RTT viewer but after diconnecting DK and again connecting not logs are shown

Output before disconnecting

After disconnecting and again connecting

RE: Jlink RTT Viewer not working with NRF52832

Jared — Wed, 06 Jul 2022 10:30:30 GMT

The ble_app_blinky example will use the UART as backend for the logger module not RTT:

RE: Jlink RTT Viewer not working with NRF52832

meet10 — Wed, 06 Jul 2022 09:51:54 GMT

Hi Jared

Thank for your response

I am using the same firmware on both the boards. No I have not modified blinky example. The other boards which i have tried are NRF538340 and NRF52833

RE: Jlink RTT Viewer not working with NRF52832

Jared — Wed, 06 Jul 2022 08:56:36 GMT

Hi,

Are you using the same firmware on both boards? Have you modified anything from the blinky example?

regards

Jared