nrf_gzll_get_channel_table always returning false

[astella]

To the kind attention of Nordic support team,

I have been successfully using all gzll routines like in https://devzone.nordicsemi.com/f/nordic-q-a/57839/how-to-prove-to-myself-that-secured-gazell-library-is-encrypting-data

to get and set gzll related parameters. In particular I used nrf_gzll_get_channel_table without any problem.

Now the demo project I'm working on has gone bigger, it includes other than secured gzll, USB, Connectivity firmware and softdevice.

I need to change default gzll parameters so that it can communicate with a legacy code.

When I call nrf_gzll_get_channel_table right now, it is always returning false! I'm really surprised. Unfortunatelly I cannot go inside nrf_gzll_get_channel_table 

and am kind of lost. Do you have any theoretical suggestion you feel you want to give me?

I have to say that everything in demo project is working very well, and your libraries seems to be very stable. And 

a very good software environment to build on.

Thank you for your attention and please tell me what kind of details I could provide, should the need arise.

[Håkon Alseth]

Hi,

 

When I call nrf_gzll_get_channel_table right now, it is always returning false! I'm really surprised. Unfortunatelly I cannot go inside nrf_gzll_get_channel_table 

Could you share what you're passing to the function? if you do not provide it enough memory (large enough array), it can return false. 

 

Kind regards,

Håkon

[astella]

Hi I tried passing the pointer uint8_t* to a declared array of 80 elements.

[Håkon Alseth]

Like this? Or another way?

uint8_t channel_tab[80];
uint32_t size_of_channel_tab = sizeof(channel_tab);

bool ret = nrf_gzll_get_channel_table(channel_tab, &size_of_channel_tab);
if (ret == false)
{
    /* Handle error */
}

 

Its important that you provide a size variable as a pointer, and the content of the variable is equal or larger than the channel tab, as described in the header nrf_gzll.h:

/**
 * @brief Get the table of Radio Frequency (RF) channels.
 *
 * @param p_channel_table Pointer to copy the channel table to.
 * @param p_size          Pointer to copy the size of the channel table to.
 *                        The value already at size must be at least the size
 *                        of the channel table.
 *
 * @retval true  If the channel table was copied to channel_table.
 * @retval false If the channel_table pointer was NULL,
 *               or the size was not large enough.

 

Kind regards,

Håkon

[astella]

Unfortunately, this doesn't work. I also tried putting channel_tab in different memory regions. I'll do other test and then I'll be updating here. Thank you

[astella]

It seems that I succeeded:

in my case I have to call nrf_gzll_set_channel_table before calling nrf_gzll_get_channel_table. I thought that it could be possible to call a get without a set, to read default parameters. But in my case it seems to be not the case. I don't know if it is a general thing or something that is happening in my specific condition. This I really don't know. Anyway, I'm using SDK15.2, segger embedded studio and secured gazell libraries.