NRF_LOG_HEXDUMP_INFO Extra Characters

[phipi]

I'm trying to print a 20 byte array over uart before sending it on BLE. My array contains:

{0x34, 0x12, 0x00, 0xFF, 0x00, 0xFF, ..., 0x00, 0xFF}

However when I try to use the NRF_LOG_HEXDUMP_INFO function to print this it only prints 8 bytes per line and I get a bunch of garbage characters at the end of each line:

<info> app:  34 12 00 FF 00 FF 00 FF|4..▒.▒.▒
<info> app:  00 FF 00 FF 00 FF 00 FF|.▒.▒.▒.▒
<info> app:  00 FF 00 FF            |.▒.▒
<info> app:  34 12 00 FF 00 FF 00 FF|4..▒.▒.▒
<info> app:  00 FF 00 FF 00 FF 00 FF|.▒.▒.▒.▒
<info> app:  00 FF 00 FF            |.▒.▒

Does anyone know what's causing this or how to fix it so that it prints all 20 bytes on 1 line without the garbage at the end? I've tried adding a CR and newline at the end of the array but that made no difference.

[Jørgen Holmefjord]

The "garbage characters" at the end is the ASCII character corresponding to the byte. This is a typical output format of a hexdump. If you do not want this, you need to modify the NRF_LOG library in the SDK, or use one of the other NRF_LOG functions. Which SDK version are you using?

[phipi]

Ah yes I see that now. Is there a function that will not print the data twice? Either the string or the ascii characters are fine.

Using SDK 14

[Jørgen Holmefjord]

No, but you can make one yourself:

void NRF_LOG_INFO_ARRAY(uint8_t * array, uint8_t array_size)
{
    for(int i = 0; i < array_size; i++)
    {
        NRF_LOG_RAW_INFO("0x%x ",array[i]);
    }
    NRF_LOG_RAW_INFO("\r\n");
}

uint8_t const size = 20;
uint8_t array[size] = {0x34, 0x12, 0x36, 0x38, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, \
                       0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF};
NRF_LOG_INFO_ARRAY(array, size);

Best regards,

Jørgen