nRF52840 SDK16 - Print an array of hex values using NRF_LOG_HEXDUMP_INFO

[Nikosant03]

Hi everyone,

I want to serial print an array of bytes in hex format. The array size is 200bytes. I tried to use the NRF_LOG_HEXDUMP_INFO but it doesn't print all the array, it prints just the first 72bytes

The second approach works fine. How I would like to use the  NRF_LOG_HEXDUMP_INFO since it is an out of the box function.

// First approach
  NRF_LOG_HEXDUMP_INFO(read_raw_data,read_payload);

// Second approach
  char changeline = 20;
  for (int i = 0; i < read_payload; i++) {
    NRF_LOG_RAW_INFO("0x%x ", read_raw_data[i]);
    NRF_LOG_FLUSH();
    if (i == changeline-1) {
      NRF_LOG_RAW_INFO("\r\n");
      changeline += 20;
    }
  }

Thanks in advance

Nick

[Nikosant03]

Hi Vidar,

Vidar Berg said:

Are you using RTT or UART

I am using RTT

Indeed, I used Putty and I do not lose logs

Vidar Berg said:

Can you try to make  'read_raw_data' "static" instead

I did the  'read_raw_data' "static"  but there is no effect on RTT backend

[Vidar Berg]

So you are not losing logs if you use Putty, or did you meant to say that you are still losing logs?

[Nikosant03]

No I don't losing data thanks. I will proceed with UART.

However I was wondering whyI lose data with RTT... but if this is complicated to investigate nevermind :)

[Vidar Berg]

Ok, that's good to know, thanks for confirming. But were you using Putty with RTT or UART?  I guess it has something to do with the Jlink RTT settings. I will try to look into it. Maybe it would help to increase the RTT buffers.

[Vidar Berg]

Increasing the size of the RTT buffers seem to do the trick: