nRF52 2832 debug log via UART to PuTTY

[Bilal Bouguerra]

Hello,

I'm using nRF52 2832 with SDK 12.3.0 and I want to know if there is a simple way to log via UART to PuTTY for debug.

Thanks for your answers.

[Vidar Berg]

Hello,

Most of the SDK examples include the logger module that lets you print debug messages over UART or RTT. Just make sure that UART is selected in your sdk_config file:

[Bilal Bouguerra]

UART is enabled in my sdk_config file, my configuration is the following:

#ifndef UART_ENABLED
#define UART_ENABLED 1
#endif

#if  UART_ENABLED

#ifndef UART_DEFAULT_CONFIG_HWFC
#define UART_DEFAULT_CONFIG_HWFC 0
#endif

#ifndef UART_DEFAULT_CONFIG_PARITY
#define UART_DEFAULT_CONFIG_PARITY 0
#endif

// UART_DEFAULT_CONFIG_BAUDRATE set to 230400

#ifndef UART_DEFAULT_CONFIG_BAUDRATE
#define UART_DEFAULT_CONFIG_BAUDRATE 61865984
#endif


#ifndef UART_DEFAULT_CONFIG_IRQ_PRIORITY
#define UART_DEFAULT_CONFIG_IRQ_PRIORITY 7
#endif

#ifndef UART_EASY_DMA_SUPPORT
#define UART_EASY_DMA_SUPPORT 1
#endif

#ifndef UART_LEGACY_SUPPORT
#define UART_LEGACY_SUPPORT 1
#endif


#ifndef UART0_ENABLED
#define UART0_ENABLED 1
#endif

#if  UART0_ENABLED
 
#ifndef UART0_CONFIG_USE_EASY_DMA
#define UART0_CONFIG_USE_EASY_DMA 1
#endif

#endif //UART0_ENABLED


#ifndef UART_CONFIG_LOG_ENABLED
#define UART_CONFIG_LOG_ENABLED 1
#endif
#if  UART_CONFIG_LOG_ENABLED
// UART_CONFIG_LOG_LEVEL  - To see all levels of log from debug to error

#ifndef UART_CONFIG_LOG_LEVEL
#define UART_CONFIG_LOG_LEVEL 4
#endif

#endif //UART_CONFIG_LOG_ENABLED

#endif //UART_ENABLED


#ifndef NRF_LOG_ENABLED
#define NRF_LOG_ENABLED 1
#endif

#if  NRF_LOG_ENABLED

#ifndef NRF_LOG_USES_COLORS
#define NRF_LOG_USES_COLORS 0
#endif

// NRF_LOG_DEFAULT_LEVEL  - To see all levels of log from debug to error

#ifndef NRF_LOG_DEFAULT_LEVEL
#define NRF_LOG_DEFAULT_LEVEL 4
#endif

#ifndef NRF_LOG_DEFERRED
#define NRF_LOG_DEFERRED 0
#endif

#ifndef NRF_LOG_USES_TIMESTAMP
#define NRF_LOG_USES_TIMESTAMP 0
#endif

#endif //NRF_LOG_ENABLED


#ifndef NRF_LOG_BACKEND_MAX_STRING_LENGTH
#define NRF_LOG_BACKEND_MAX_STRING_LENGTH 256
#endif

#ifndef NRF_LOG_TIMESTAMP_DIGITS
#define NRF_LOG_TIMESTAMP_DIGITS 8
#endif

#ifndef NRF_LOG_BACKEND_SERIAL_USES_UART
#define NRF_LOG_BACKEND_SERIAL_USES_UART 1
#endif

#if  NRF_LOG_BACKEND_SERIAL_USES_UART

// NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE  - set to 230400

#ifndef NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE
#define NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE 61865984
#endif

#ifndef NRF_LOG_BACKEND_SERIAL_UART_TX_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_TX_PIN 12
#endif

#ifndef NRF_LOG_BACKEND_SERIAL_UART_RX_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_RX_PIN 5
#endif

#ifndef NRF_LOG_BACKEND_SERIAL_UART_RTS_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_RTS_PIN 5
#endif

#ifndef NRF_LOG_BACKEND_SERIAL_UART_CTS_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_CTS_PIN 7
#endif


#ifndef NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL
#define NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL 0
#endif


#ifndef NRF_LOG_BACKEND_UART_INSTANCE
#define NRF_LOG_BACKEND_UART_INSTANCE 0
#endif

#endif //NRF_LOG_BACKEND_SERIAL_USES_UART

My main is the following:

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

#include "mmt_display.h"
#include "nrf_log_ctrl.h"

int main(void)
{
		
	ret_code_t err_code = NRF_LOG_INIT(NULL);
	char string_on_stack[] = "stack";
    NRF_LOG_INFO("%s",nrf_log_push(string_on_stack));

    while (true)
    {
        /* Do nothing */
    }
}

I opened a PuTTY serial connexion with 230400 baudrate, no HFWC, no parity, 8 data bits and 1 stop bit.

But I can't print anything on PuTTY. Am I missing something ?

[Vidar Berg]

Hi, 

default baudrate is 115200, but is configurable in sdk_config.h. Also, the log buffer must be processed in main context if you have deferred logging enabled (default).

You can include this macro in your main loop to process the log buffers:

int main()

{

    ...

    for(;;)

    {

       NRF_LOG_PROCESS();

    }

}

[Bilal Bouguerra]

Hi,

As you can see in the configuration (sdk_config.h) I shared in my precedent post, I haven't activated deffered logging:

#ifndef NRF_LOG_DEFERRED
#define NRF_LOG_DEFERRED 0
#endif

Also in my config I have configured the baudrate to 230400:

// UART_DEFAULT_CONFIG_BAUDRATE set to 230400

#ifndef UART_DEFAULT_CONFIG_BAUDRATE
#define UART_DEFAULT_CONFIG_BAUDRATE 61865984
#endif


#if  NRF_LOG_BACKEND_SERIAL_USES_UART

// NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE  - set to 230400

#ifndef NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE
#define NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE 61865984
#endif

#endif //NRF_LOG_BACKEND_SERIAL_USES_UART

I still can't print log in PuTTY.

[Vidar Berg]

I overlooked your config settings for some reason. See now that you are using a different pinout so I guess you are not using the nRF52 DK as I thought. What are you using to connect the UART interface to the PC?